CASCACascade Atlas

Evidence dossier

CVE-2020-3259

Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Information Disclosure Vulnerability

Exploited in the wild (CISA KEV since Feb 15, 2024). NVD reports CVSS 3.1 7.5. EPSS estimates 71.8% exploit likelihood as of Aug 27, 2026.

79.2–85.3Priority evidence range
Evidence current through Aug 27, 2026, 6:09 PM UTC

As of Aug 27, 2026

Normalized restatement

A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to retrieve memory contents on an affected device, which could lead to the disclosure of confidential information. The vulnerability is due to a buffer tracking issue when the software parses invalid URLs that are requested from the web services interface. An attacker could exploit this vulnerability by sending a crafted GET request to the web services interface. A successful exploit could allow the attacker to retrieve memory contents, which could lead to the disclosure of confidential information. Note: This vulnerability affects only specific AnyConnect and WebVPN configurations. For more information, see the Vulnerable Products section.

State
PUBLISHED
Published
May 6, 2020
Updated
Oct 21, 2025
Evidence coverage
92%

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
    cisco

    Record text: Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Information Disclosure Vulnerability

    Inspect raw assertion
    Field
    container
    Value
    Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Information Disclosure Vulnerability
    Original evidence ↗
  3. 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 ↗
  4. Source dateFirst observed by CASCA
    CISA KEV

    Exploitation cataloged: Cisco ASA and FTD Information Disclosure Vulnerability

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    Cisco ASA and FTD Information Disclosure Vulnerability
    Original evidence ↗
  5. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 71.79% probability · 99.38th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.717890000000; percentile 0.993750000000
    Original evidence ↗
ExploitationCatalog member

CISA KEV · catalog date Feb 15, 2024 · first observed Jul 19, 2026

Exploit likelihood71.79%

FIRST EPSS · score date Aug 27, 2026 · 99.4th percentile · first observed Aug 27, 2026

SeverityCVSS 7.5

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

casca-unknown-reasons-v1
Exploitation statusEvidence supported

Eligible evidence is present for this bounded claim.

Revision
evidence-policy-v1.1.0
Cutoff
Aug 27, 2026
Resolution
None
Exploit likelihoodEvidence supported

Eligible evidence is present for this bounded claim.

Revision
evidence-policy-v1.1.0
Cutoff
Aug 27, 2026
Resolution
None
Severity assessmentEvidence supported

Eligible evidence is present for this bounded claim.

Revision
casca-direct-cvss-eligibility-v1
Cutoff
Aug 27, 2026
Resolution
None
Affected productsSource-reported scope

The cited source assertion is retained while canonical product linkage remains open.

Revision
casca-factor-d-obligations-v1
Cutoff
Aug 27, 2026
Resolution
Resolve identity

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 ↗
ciscoOriginal assertion
Record text

Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Information Disclosure Vulnerability

Inspect raw assertion
Field
container
Value
Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Information Disclosure Vulnerability
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 ↗
CISA KEVOriginal assertion
Exploitation cataloged

Cisco ASA and FTD Information Disclosure Vulnerability

Inspect raw assertion
Field
observed_exploitation
Value
Cisco ASA and FTD Information Disclosure Vulnerability
Source dateFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

71.79% probability · 99.38th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.717890000000; percentile 0.993750000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
9Underlying assertions
2Canonical products
9Target 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

12 scope groups

CISA-ADP · source assertedciscoadaptive_security_appliance_softwareDirect source scope
Affected: 9.9 to before 9.9.2..67 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "9.9", "lessThan": "9.9.2..67", "versionType": "custom"}]
CISA-ADP · source assertedciscoadaptive_security_appliance_softwareDirect source scope
Affected: 9.10 to before 9.10.1.40 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "9.10", "lessThan": "9.10.1.40", "versionType": "custom"}]
CISA-ADP · source assertedciscoadaptive_security_appliance_softwareDirect source scope
Affected: 9.12 to before 9.12.3.9 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "9.12", "lessThan": "9.12.3.9", "versionType": "custom"}]
CISA-ADP · source assertedciscoadaptive_security_appliance_softwareDirect source scope
Affected: 9.13 to before 9.13.1.10 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "9.13", "lessThan": "9.13.1.10", "versionType": "custom"}]
CISA-ADP · source assertedciscoadaptive_security_appliance_softwareDirect source scope
Affected: 9.8 to before 9.8.4.20 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "9.8", "lessThan": "9.8.4.20", "versionType": "custom"}]
CISA-ADP · source assertedciscofirepower_threat_defenseDirect source scope
Affected: 6.2.3 to before 6.2.3.16 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "6.2.3", "lessThan": "6.2.3.16", "versionType": "custom"}]
CISA-ADP · source assertedciscofirepower_threat_defenseDirect source scope
Affected: 6.3.0 to before 6.3.0.6 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "6.3.0", "lessThan": "6.3.0.6", "versionType": "custom"}]
CISA-ADP · source assertedciscofirepower_threat_defenseDirect source scope
Affected: 6.4.0 to before 6.4.0.9 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "6.4.0", "lessThan": "6.4.0.9", "versionType": "custom"}]
CISA-ADP · source assertedciscofirepower_threat_defenseDirect source scope
Affected: 6.5.0 to before 6.5.0.5 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "6.5.0", "lessThan": "6.5.0.5", "versionType": "custom"}]
cisco · source assertedCiscoCisco Adaptive Security Appliance (ASA) SoftwareDirect source scope
Affected: n/a
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "n/a"}]
NVD CPE · OPERATING SYSTEMciscoadaptive_security_appliance_softwareVulnerable target · 5 assertions
Any version (unconstrained) (>= 9.10, < 9.10.1.40); Any version (unconstrained) (>= 9.12, < 9.12.3.9); Any version (unconstrained) (>= 9.13, < 9.13.1.10); Any version (unconstrained) (>= 9.8, < 9.8.4.20); Any version (unconstrained) (>= 9.9, < 9.9.2.67)Canonical identity product-4f9b01b0d2b49f62a97941ed22de23d9f3ec08f598a5617c413c154933c87a27Linked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 6
    Logic
    OR
    Version bounds
    from including 9.10; through excluding 9.10.1.40
    Match ID
    8ccf1eaa-45f3-4155-b8da-f34213c911f7
  2. cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 8
    Logic
    OR
    Version bounds
    from including 9.13; through excluding 9.13.1.10
    Match ID
    526a1138-61c7-44ad-a925-b38bdb353238
  3. cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 4
    Logic
    OR
    Version bounds
    from including 9.8; through excluding 9.8.4.20
    Match ID
    ceb1af51-43da-4399-8264-e0a2e629f799
  4. cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 5
    Logic
    OR
    Version bounds
    from including 9.9; through excluding 9.9.2.67
    Match ID
    2ca468f1-6a40-42fb-82d6-98ae314712a3
  5. cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 7
    Logic
    OR
    Version bounds
    from including 9.12; through excluding 9.12.3.9
    Match ID
    a2380a3f-d64e-4db2-95ab-783e83da7e51
NVD CPE · APPLICATIONciscofirepower_threat_defenseVulnerable target · 4 assertions
Any version (unconstrained) (>= 6.2.3, < 6.2.3.16); Any version (unconstrained) (>= 6.3.0, < 6.3.0.6); Any version (unconstrained) (>= 6.4.0, < 6.4.0.9); Any version (unconstrained) (>= 6.5.0, < 6.5.0.5)Canonical identity product-0592c4f8ad106ab59a79a9d85898a9bdbd87550fa42008d1f27114d8b94a3910Linked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 2
    Logic
    OR
    Version bounds
    from including 6.4.0; through excluding 6.4.0.9
    Match ID
    06741056-2bfd-4f88-917a-f581f813b69e
  2. cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 0
    Logic
    OR
    Version bounds
    from including 6.2.3; through excluding 6.2.3.16
    Match ID
    c4b2e5d3-ed34-4a7e-bd8f-8492b6737677
  3. cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 3
    Logic
    OR
    Version bounds
    from including 6.5.0; through excluding 6.5.0.5
    Match ID
    3ed0e59c-146c-494f-ad46-f6fb43f9c575
  4. cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 1
    Logic
    OR
    Version bounds
    from including 6.3.0; through excluding 6.3.0.6
    Match ID
    9d27de97-510a-4761-8184-6940745b54e2

Affected-product evidence

Accepted scope and product mapping

2 canonical links · 1 source-reported links

Mapping establishedEvidence supported

vendor-0774b265c0e837e737aaf99ed0f2450c048e61f34267ca59d8623878b839334e · product-0592c4f8ad106ab59a79a9d85898a9bdbd87550fa42008d1f27114d8b94a3910

Source class
Nvd cpe vulnerable target
Assertions
4
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
14ed28d4-bfaa-4ff1-b427-a9721cd28db868d0d11d-83bb-4d02-a05f-9b95b7fb866fc9530cc5-d320-4444-8e7d-4b7231ee5761d1491036-7420-47f0-8e7c-4b97b4aef497
Mapping establishedEvidence supported

vendor-0774b265c0e837e737aaf99ed0f2450c048e61f34267ca59d8623878b839334e · product-4f9b01b0d2b49f62a97941ed22de23d9f3ec08f598a5617c413c154933c87a27

Source class
Nvd cpe vulnerable target
Assertions
5
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
2ba08aa0-66f0-4f7f-bc64-9a18458606b65875478a-7467-4f65-bcbc-d2b10df974bc7dd02a0f-9d08-4c76-98a6-47a5add5937087ceac4f-870b-4d3a-bcc7-90aeea9d1a9fa82fde94-273a-4c67-92f5-133e83ad5b48
Source-reported scopeSource-reported scope

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

Vendor specified only by source · Product specified only by source

Source class
Direct cve affected
Assertions
10
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
3f6c6b6d-ab0d-44d9-9a19-af1b698a2fa74136b8ea-e6fd-49cf-b6fc-5dd23fef9ad34a08e325-a12b-4fbb-a19b-0f7230ec52b85427eca1-d37a-4efc-848f-14ae87db918d5aa7ac0f-54ab-4682-98cd-3184da3d92b482b32bf3-cbd9-46b4-b862-5d14cb06eac4af69568c-f719-4cba-ba7e-f2d65de5b211bd62cbd9-af05-41e0-aed7-22d0804a0cfedcd0fbad-7db7-4aae-ba3c-7492a93225bae89f8310-2306-4c30-9e53-6c0920e898e7

Assessments

CVSS by origin

7.5
NVDCVSS 3.1 · role Primary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.0
NVDCVSS 2.0 · role Primary · priority eligiblevalid_matchAV:N/AC:L/Au:N/C:P/I:N/A:N
7.5
psirt@cisco.comCVSS 3.0 · role Secondary · priority eligiblevalid_matchCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5
ciscoCVSS 3.0 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Direct CVE/CNA normalized decisions

7.5Priority eligible

cisco

CVSS 3.0 · Primary · Original assertion · rank 1

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Validation
Valid match
Recomputed
7.5
Decision reason
Evidence supported
Policy
casca-direct-cvss-eligibility-v1

Assessments are retained side by side under closed precedence. Cascade never averages CVSS.

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.
  • 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.