CASCACascade Atlas

Evidence dossier

CVE-2021-1497

Cisco HyperFlex HX Command Injection Vulnerabilities

Exploited in the wild (CISA KEV since Nov 3, 2021). NVD reports CVSS 3.1 9.8. EPSS estimates 99.9% exploit likelihood as of Aug 8, 2026.

87.1–88.7Priority evidence range
Evidence current through Aug 27, 2026, 6:09 PM UTC

As of Aug 27, 2026

Normalized restatement

Multiple vulnerabilities in the web-based management interface of Cisco HyperFlex HX could allow an unauthenticated, remote attacker to perform command injection attacks against an affected device. For more information about these vulnerabilities, see the Details section of this advisory.

State
PUBLISHED
Published
May 6, 2021
Updated
Oct 21, 2025
Evidence coverage
95%

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 HyperFlex HX Command Injection Vulnerabilities

    Inspect raw assertion
    Field
    container
    Value
    Cisco HyperFlex HX Command Injection Vulnerabilities
    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 HyperFlex HX Installer Virtual Machine Command Injection Vulnerability

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    Cisco HyperFlex HX Installer Virtual Machine Command Injection Vulnerability
    Original evidence ↗
  5. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 99.93% probability · 99.97th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.999280000000; percentile 0.999680000000
    Original evidence ↗
ExploitationCatalog member

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

Exploit likelihood99.93%

FIRST EPSS · score date Aug 8, 2026 · 100th percentile · first observed Aug 8, 2026

SeverityCVSS 9.8

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

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 HyperFlex HX Command Injection Vulnerabilities

Inspect raw assertion
Field
container
Value
Cisco HyperFlex HX Command Injection Vulnerabilities
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 HyperFlex HX Installer Virtual Machine Command Injection Vulnerability

Inspect raw assertion
Field
observed_exploitation
Value
Cisco HyperFlex HX Installer Virtual Machine Command Injection Vulnerability
Source dateFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

99.93% probability · 99.97th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.999280000000; percentile 0.999680000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
9Underlying assertions
8Canonical products
2Target assertions
7Constraint assertions

Grouped from 2 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

9 scope groups

cisco · source assertedCiscoCisco HyperFlex HX Data PlatformDirect 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 · HARDWAREciscohyperflex_hx220c_af_m5Environmental constraint · 1 assertions
Version not applicableCanonical identity product-1d57c9719c67133e2001eb0b2d75a2d8f9b352315f551e23dd1c4996033e1930Linked exact
Scope constrained
Inspect raw assertion
  1. cpe:2.3:h:cisco:hyperflex_hx220c_af_m5:-:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Environmental constraint
    Configuration
    0 · node/1 · match 0
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    0d5afde1-3a3b-4af8-a425-492558b0b2ea
NVD CPE · HARDWAREciscohyperflex_hx220c_all_nvme_m5Environmental constraint · 1 assertions
Version not applicableCanonical identity product-35eb8f092bdb1e4a1bdcd51677956ff389187668653869cbe00f54df2e1d236dLinked exact
Scope constrained
Inspect raw assertion
  1. cpe:2.3:h:cisco:hyperflex_hx220c_all_nvme_m5:-:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Environmental constraint
    Configuration
    0 · node/1 · match 1
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    43cafbef-82ac-425c-b659-7856c2adc7df
NVD CPE · HARDWAREciscohyperflex_hx220c_edge_m5Environmental constraint · 1 assertions
Version not applicableCanonical identity product-2b1575fb6ea3410d3a08d8db9495d033bf1c127cceae36f88d61e4218a128bceLinked exact
Scope constrained
Inspect raw assertion
  1. cpe:2.3:h:cisco:hyperflex_hx220c_edge_m5:-:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Environmental constraint
    Configuration
    0 · node/1 · match 2
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    9b38e0ba-d320-406b-8739-6218b96dfd24
NVD CPE · HARDWAREciscohyperflex_hx220c_m5Environmental constraint · 1 assertions
Version not applicableCanonical identity product-b86f1e39b40a3621b0f308f0b225ae94db9f59882a1ed1d87d43e67455711dabLinked exact
Scope constrained
Inspect raw assertion
  1. cpe:2.3:h:cisco:hyperflex_hx220c_m5:-:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Environmental constraint
    Configuration
    0 · node/1 · match 3
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    6e19d6af-e190-463d-b359-bb02362490d1
NVD CPE · HARDWAREciscohyperflex_hx240cEnvironmental constraint · 1 assertions
Version not applicableCanonical identity product-2d0fec180e0265f8350c0055330098f086aa4b244c62d93031192aa0147cce47Linked exact
Scope constrained
Inspect raw assertion
  1. cpe:2.3:h:cisco:hyperflex_hx240c:-:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Environmental constraint
    Configuration
    0 · node/1 · match 4
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    f4440219-aa2a-4aa3-b780-2f2db62d0100
NVD CPE · HARDWAREciscohyperflex_hx240c_af_m5Environmental constraint · 1 assertions
Version not applicableCanonical identity product-850b1257ed2cf6aac6e736190e17bacb013e7420cb1070f80381cee26bd3ebb5Linked exact
Scope constrained
Inspect raw assertion
  1. cpe:2.3:h:cisco:hyperflex_hx240c_af_m5:-:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Environmental constraint
    Configuration
    0 · node/1 · match 5
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    eff775a8-5a2c-42b7-b26c-85921d803a25
NVD CPE · HARDWAREciscohyperflex_hx240c_m5Environmental constraint · 1 assertions
Version not applicableCanonical identity product-7dfe65808fd1c50cc3de8ae03a599631ba96605fd61f1b8479d63a2d15a15e0dLinked exact
Scope constrained
Inspect raw assertion
  1. cpe:2.3:h:cisco:hyperflex_hx240c_m5:-:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Environmental constraint
    Configuration
    0 · node/1 · match 6
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    5009ec3a-40c9-44b0-8e5e-599657f819fa
NVD CPE · OPERATING SYSTEMciscohyperflex_hx_data_platformVulnerable target · 2 assertions
Any version (unconstrained) (< 4.0\(2e\)); Any version (unconstrained) (>= 4.5, < 4.5\(2a\))Canonical identity product-093132c59ae3ef35bdffb865883d968a6ed214c2e8718c978268d59affd4b2a4Linked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:o:cisco:hyperflex_hx_data_platform:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 0
    Logic
    OR
    Version bounds
    through excluding 4.0\(2e\)
    Match ID
    17bc381c-f6cd-4b90-b4ae-8544966ecce6
  2. cpe:2.3:o:cisco:hyperflex_hx_data_platform:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 1
    Logic
    OR
    Version bounds
    from including 4.5; through excluding 4.5\(2a\)
    Match ID
    d125a3ba-3182-4e44-92cb-e46ca2d5292d

Affected-product evidence

Accepted scope and product mapping

1 canonical links · 1 source-reported links

Mapping establishedEvidence supported

vendor-0774b265c0e837e737aaf99ed0f2450c048e61f34267ca59d8623878b839334e · product-093132c59ae3ef35bdffb865883d968a6ed214c2e8718c978268d59affd4b2a4

Source class
Nvd cpe vulnerable target
Assertions
2
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
383c46a7-f6c1-4c63-9556-5f18221299b9688ea059-4d4e-47e3-9816-62dbf9adddf7
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
1
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
88d1339b-e37a-4570-966f-5a72637a17aa

Assessments

CVSS by origin

9.8
NVDCVSS 3.1 · role Primary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0
NVDCVSS 2.0 · role Primary · priority eligiblevalid_matchAV:N/AC:L/Au:N/C:C/I:C/A:C
9.8
psirt@cisco.comCVSS 3.1 · role Secondary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8
ciscoCVSS 3.1 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Direct CVE/CNA normalized decisions

9.8Priority eligible

cisco

CVSS 3.1 · Primary · Original assertion · rank 1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Validation
Valid match
Recomputed
9.8
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.