CASCACascade Atlas

Evidence dossier

CVE-2021-22894

A buffer overflow vulnerability exists in Pulse Connect Secure before 9.1R11.4 allows a remote authenticated attacker to execute arbitrary code as the root user via maliciously…

Exploited in the wild (CISA KEV since Nov 3, 2021). NVD reports CVSS 3.1 8.8. EPSS estimates 41.3% exploit likelihood as of Aug 27, 2026.

77.5–79.0Priority evidence range
Evidence current through Aug 27, 2026, 6:09 PM UTC

As of Aug 27, 2026

Normalized restatement

A buffer overflow vulnerability exists in Pulse Connect Secure before 9.1R11.4 allows a remote authenticated attacker to execute arbitrary code as the root user via maliciously crafted meeting room.

State
PUBLISHED
Published
May 27, 2021
Updated
Oct 21, 2025
Evidence coverage
99%

Evidence chronology

What was known when

Download this view's receipt →
  1. Source dateSource date omittedFirst observed by CASCA
    CISA-ADP

    Record text: CISA ADP Vulnrichment

    Inspect raw assertion
    Field
    container
    Value
    CISA ADP Vulnrichment
    Original evidence ↗
  2. Source dateSource date omittedFirst observed by CASCA
    CVE Program

    Record text: CVE Program Container

    Inspect raw assertion
    Field
    container
    Value
    CVE Program Container
    Original evidence ↗
  3. Source dateSource date omittedFirst observed by CASCA
    hackerone

    Record text: A buffer overflow vulnerability exists in Pulse Connect Secure before 9.1R11.4 allows a remote authenticated attacker to execute arbitrary code as the root user via maliciously crafted meeting room.

    Inspect raw assertion
    Field
    container
    Value
    A buffer overflow vulnerability exists in Pulse Connect Secure before 9.1R11.4 allows a remote authenticated attacker to execute arbitrary code as the root user via maliciously crafted meeting room.
    Original evidence ↗
  4. Source dateFirst observed by CASCA
    CISA KEV

    Exploitation cataloged: Ivanti Pulse Connect Secure Collaboration Suite Buffer Overflow Vulnerability

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    Ivanti Pulse Connect Secure Collaboration Suite Buffer Overflow Vulnerability
    Original evidence ↗
  5. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 41.28% probability · 98.56th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.412840000000; percentile 0.985630000000
    Original evidence ↗
ExploitationCatalog member

CISA KEV · catalog date Nov 3, 2021 · first observed Jul 19, 2026

Exploit likelihood41.28%

FIRST EPSS · score date Aug 27, 2026 · 98.6th percentile · first observed Aug 27, 2026

SeverityCVSS 8.8

NVD · CVSS 3.1 · first observed Jul 19, 2026 · same-version scores align in this snapshot

Evidence detail

Source limits and decisions

Why each evidence state has this value

Outside this view’s verified evidence

Reason detail begins outside this selected snapshot; the state remains source-bound.

Source comparison

Who said what

CISA-ADPIndependent enrichment
Record text

CISA ADP Vulnrichment

Inspect raw assertion
Field
container
Value
CISA ADP Vulnrichment
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CVE ProgramDerivative copy
Record text

CVE Program Container

Inspect raw assertion
Field
container
Value
CVE Program Container
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
hackeroneOriginal assertion
Record text

A buffer overflow vulnerability exists in Pulse Connect Secure before 9.1R11.4 allows a remote authenticated attacker to execute arbitrary code as the root user via maliciously crafted meeting room.

Inspect raw assertion
Field
container
Value
A buffer overflow vulnerability exists in Pulse Connect Secure before 9.1R11.4 allows a remote authenticated attacker to execute arbitrary code as the root user via maliciously crafted meeting room.
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CISA KEVOriginal assertion
Exploitation cataloged

Ivanti Pulse Connect Secure Collaboration Suite Buffer Overflow Vulnerability

Inspect raw assertion
Field
observed_exploitation
Value
Ivanti Pulse Connect Secure Collaboration Suite Buffer Overflow Vulnerability
Source dateFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

41.28% probability · 98.56th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.412840000000; percentile 0.985630000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
40Underlying assertions
1Canonical products
40Target assertions
0Constraint assertions

Grouped from 1 configuration nodes in this exact snapshot. Visual grouping is navigational; asset exposure and root cause require cited evidence.

Identity source boundaries
  • Cpe dictionary1,775,266 records · observed through 2026-07-21T06:45:29.809Z27d65b0f-b718-4b4f-bb79-c47c68d09dfa
  • Cpe match643,502 records · observed through 2026-07-21T08:13:17.697Z955dae73-7302-438b-aee1-058d7cc5d48e

2 scope groups

hackerone · source assertedn/aPulse Connect SecureDirect source scope
Affected: Fixed version 9.1R11.4
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "Fixed version 9.1R11.4"}]
NVD CPE · APPLICATIONivanticonnect_secureVulnerable target · 40 assertions
Version 9.0; Version 9.1Canonical identity product-0675def37879dcf14a27022586db7f5234f5d2c3f293e3a70a47a5da19da3b1bLinked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:a:ivanti:connect_secure:9.1:r7:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 32
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    ad812596-c77c-4129-982f-c22a25b52126
  2. cpe:2.3:a:ivanti:connect_secure:9.0:r4.0:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 13
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    e49ff0c8-cf7b-43d2-a144-5ed73848d875
  3. cpe:2.3:a:ivanti:connect_secure:9.1:r6:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 31
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    3ccc2d7b-f835-45ec-a316-2f0c5f2cf565
  4. cpe:2.3:a:ivanti:connect_secure:9.0:r3.0:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 7
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    105b8b46-a328-4163-82ff-f4236fca9b2d
  5. cpe:2.3:a:ivanti:connect_secure:9.1:r4.3:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 29
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    0349a0cc-a372-4e51-899e-d7ba67876f4b
  6. cpe:2.3:a:ivanti:connect_secure:9.1:r4.2:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 28
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    3de32a0c-8944-4f51-a286-266055ca4b2f
  7. cpe:2.3:a:ivanti:connect_secure:9.0:r3.3:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 10
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    59f4a6f7-a6d4-4517-a316-7c7c002a9ed3
  8. cpe:2.3:a:ivanti:connect_secure:9.1:r8.2:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 35
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    dfe8fa87-9622-4d5b-99c7-d8ee230c0aa9
  9. cpe:2.3:a:ivanti:connect_secure:9.0:r4:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 12
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    a369ae09-17e4-4541-a8e1-a2f4a1398ee7
  10. cpe:2.3:a:ivanti:connect_secure:9.1:r8.4:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 36
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    07ab853d-5a3f-4142-8417-1c9fb729a89e
  11. cpe:2.3:a:ivanti:connect_secure:9.1:r9.1:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 38
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    b2c10c89-1dbc-4e91-bd28-d5097b589ca9
  12. cpe:2.3:a:ivanti:connect_secure:9.1:r4.1:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 27
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    d5355372-03ea-46d7-9104-a2785c29b664
  13. cpe:2.3:a:ivanti:connect_secure:9.1:r10.2:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 20
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    232bab6c-d318-4f80-8f49-4e700c21f535
  14. cpe:2.3:a:ivanti:connect_secure:9.1:r2:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 24
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    4fefc4b1-7350-46f9-80c1-42f5ae06142f
  15. cpe:2.3:a:ivanti:connect_secure:9.1:r11.0:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 21
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    abd840bf-944e-4f4c-96dc-0256286338f6
  16. cpe:2.3:a:ivanti:connect_secure:9.0:-:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 0
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    3818b543-3415-4e27-8dad-6ba9d3d9a1a5
  17. cpe:2.3:a:ivanti:connect_secure:9.0:r5.0:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 15
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    4755bc2c-a96e-47af-9d7c-e8d44b31f10b
  18. cpe:2.3:a:ivanti:connect_secure:9.1:r8:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 33
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    9fa0b20d-3fa1-42ae-bdc5-93d8a182927c
  19. cpe:2.3:a:ivanti:connect_secure:9.1:r8.1:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 34
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    bffa0b02-7f6d-4434-b1e7-eb8520fd68a0
  20. cpe:2.3:a:ivanti:connect_secure:9.0:r3:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 6
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    52851aaa-88fb-40bc-b41a-b821f6ba9f79
  21. cpe:2.3:a:ivanti:connect_secure:9.0:r2:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 3
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    59331dc5-ff5f-4bb3-905e-5a4a621f86ed
  22. cpe:2.3:a:ivanti:connect_secure:9.0:r4.1:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 14
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    24ef2f1a-8140-4fdb-8af4-309afaf998e1
  23. cpe:2.3:a:ivanti:connect_secure:9.0:r3.5:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 11
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    702094b0-2e5c-4a16-a8b0-f0eaf78e4ecb
  24. cpe:2.3:a:ivanti:connect_secure:9.0:r2.1:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 5
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    6a708c3f-9050-4475-95b3-4785d3e2cb69
  25. cpe:2.3:a:ivanti:connect_secure:9.0:r3.2:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 9
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    5da976d9-a330-475e-b8c0-09ef3e08f18d
  26. cpe:2.3:a:ivanti:connect_secure:9.1:r10.0:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 19
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    5aa4b39f-2fb9-4752-b1f1-18812b0990b4
  27. cpe:2.3:a:ivanti:connect_secure:9.0:r3.1:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 8
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    f05dc11e-7c41-450b-a2bf-603e9252bb40
  28. cpe:2.3:a:ivanti:connect_secure:9.0:r6.0:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 16
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    bf6e8a0c-192b-4f51-86aa-fc2b85657632
  29. cpe:2.3:a:ivanti:connect_secure:9.1:r1:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 18
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    4b21c181-dc49-4ebd-9932-dbb337151ff7
  30. cpe:2.3:a:ivanti:connect_secure:9.1:r4:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 26
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    843bc1b9-50cc-4f8f-a454-a0cec6e92290
  31. cpe:2.3:a:ivanti:connect_secure:9.1:-:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 17
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    4f450898-0b06-4073-9b76-bf22f68bd14f
  32. cpe:2.3:a:ivanti:connect_secure:9.1:r11.3:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 23
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    366ef5b8-0233-49b8-806a-e54f60410ade
  33. cpe:2.3:a:ivanti:connect_secure:9.1:r9.2:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 39
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    f54753d0-6275-4f82-b874-55438d2983b3
  34. cpe:2.3:a:ivanti:connect_secure:9.1:r5:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 30
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    93d1a098-bd77-4a7b-9070-a764fb435981
  35. cpe:2.3:a:ivanti:connect_secure:9.1:r3:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 25
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    db7a6d62-6576-4713-9bf4-11068a72e8b7
  36. cpe:2.3:a:ivanti:connect_secure:9.0:r1.0:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 2
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    2e65c588-32e5-42fb-b1c0-de80c44a9e2e
  37. cpe:2.3:a:ivanti:connect_secure:9.0:r1:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 1
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    d47d09a8-4ac4-4cd9-b648-5f26453e2e1d
  38. cpe:2.3:a:ivanti:connect_secure:9.0:r2.0:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 4
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    5f87b761-02b2-4cf1-b7fe-21f92c772ff1
  39. cpe:2.3:a:ivanti:connect_secure:9.1:r11.1:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 22
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    a1995f34-ae75-47c4-9a9d-dbb1d3e130e5
  40. cpe:2.3:a:ivanti:connect_secure:9.1:r9:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 37
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    16daa769-8f0d-4c54-a8d9-9902995605b0

Affected-product evidence

Accepted scope and product mapping

0 canonical links · 0 source-reported links

Applicability remains source-scoped; safety and exposure remain unassessed.

Assessments

CVSS by origin

8.8
NVDCVSS 3.1 · role Primary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.0
NVDCVSS 2.0 · role Primary · priority eligiblevalid_matchAV:N/AC:L/Au:S/C:C/I:C/A:C
8.8
CVE Program sourceCVSS 3.1 · role Secondary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8
CISA-ADPCVSS 3.1 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Evidence boundaries

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; remaining scope stays source-scoped.
  • NVD-carried upstream facts remain derivative; independent corroboration requires a separately authored source.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Affected-product evidence remains source-scoped; canonical linkage is required before applicability scoring.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.
  • OSV aggregation and OSV-converted NVD material are not independent corroboration.
  • Red Hat facts are vendor assertions for the exact supplied products.
  • Nonmembership and not-yet-observed states are not proof of safety.