CASCACascade Atlas

Evidence dossier

CVE-2020-3580

Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Interface Cross-Site Scripting Vulnerabilities

Exploited in the wild (CISA KEV since Nov 3, 2021). NVD reports CVSS 3.1 6.1. EPSS estimates 85.6% exploit likelihood as of Aug 27, 2026.

77.3–78.6Priority evidence range
Evidence current through Aug 27, 2026, 6:09 PM UTC

As of Aug 27, 2026

Normalized restatement

Multiple vulnerabilities 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 conduct cross-site scripting (XSS) attacks against a user of the web services interface of an affected device. The vulnerabilities are due to insufficient validation of user-supplied input by the web services interface of an affected device. An attacker could exploit these vulnerabilities by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the interface or allow the attacker to access sensitive, browser-based information. Note: These vulnerabilities affect only specific AnyConnect and WebVPN configurations. For more information, see the Vulnerable Products section.

State
PUBLISHED
Published
Oct 21, 2020
Updated
Oct 21, 2025
Evidence coverage
98%

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 Interface Cross-Site Scripting Vulnerabilities

    Inspect raw assertion
    Field
    container
    Value
    Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Interface Cross-Site Scripting 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 ASA and FTD Cross-Site Scripting (XSS) Vulnerability

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    Cisco ASA and FTD Cross-Site Scripting (XSS) Vulnerability
    Original evidence ↗
  5. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 85.58% probability · 99.71th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.855750000000; percentile 0.997060000000
    Original evidence ↗
ExploitationCatalog member

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

Exploit likelihood85.58%

FIRST EPSS · score date Aug 27, 2026 · 99.7th percentile · first observed Aug 27, 2026

SeverityCVSS 6.1

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 Interface Cross-Site Scripting Vulnerabilities

Inspect raw assertion
Field
container
Value
Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Interface Cross-Site Scripting 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 ASA and FTD Cross-Site Scripting (XSS) Vulnerability

Inspect raw assertion
Field
observed_exploitation
Value
Cisco ASA and FTD Cross-Site Scripting (XSS) Vulnerability
Source dateFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

85.58% probability · 99.71th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.855750000000; percentile 0.997060000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
9Underlying assertions
2Canonical products
9Target assertions
0Constraint 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

3 scope groups

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 · 6 assertions
Any version (unconstrained) (>= 9.10, < 9.12.4.13); Any version (unconstrained) (>= 9.13, < 9.13.1.21); Any version (unconstrained) (>= 9.14, < 9.14.2.8); Any version (unconstrained) (>= 9.15, < 9.15.1.15); Any version (unconstrained) (< 9.8.4.34); Any version (unconstrained) (>= 9.9, < 9.9.2.85)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
    1 · node/0 · match 4
    Logic
    OR
    Version bounds
    from including 9.14; through excluding 9.14.2.8
    Match ID
    282f4d3b-ccbb-484e-bdee-c316637e2f21
  2. cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    1 · node/0 · match 2
    Logic
    OR
    Version bounds
    from including 9.10; through excluding 9.12.4.13
    Match ID
    1c70e158-4028-4ca4-91cb-22e549cfbc07
  3. cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    1 · node/0 · match 3
    Logic
    OR
    Version bounds
    from including 9.13; through excluding 9.13.1.21
    Match ID
    5b74c14f-c95b-4af5-a255-1ca824aa7fde
  4. cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    1 · node/0 · match 0
    Logic
    OR
    Version bounds
    through excluding 9.8.4.34
    Match ID
    a0362f9b-b1b5-405a-a984-09b29b173888
  5. cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    1 · node/0 · match 1
    Logic
    OR
    Version bounds
    from including 9.9; through excluding 9.9.2.85
    Match ID
    8a9bffbc-f577-47cd-83e8-a6227b17d557
  6. cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    1 · node/0 · match 5
    Logic
    OR
    Version bounds
    from including 9.15; through excluding 9.15.1.15
    Match ID
    9d2794f2-bc8f-42cc-910a-203be7b3475f
NVD CPE · OPERATING SYSTEMciscofirepower_threat_defenseVulnerable target · 3 assertions
Any version (unconstrained) (< 6.4.0.12); Any version (unconstrained) (>= 6.5.0, < 6.6.4); Any version (unconstrained) (>= 6.7.0, < 6.7.0.2)Canonical identity product-13f1bd4dd017fa483ac95529d418ebd255c9ece9a794658a77bfe0471ab82e89Linked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:o:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 1
    Logic
    OR
    Version bounds
    from including 6.5.0; through excluding 6.6.4
    Match ID
    3da331cb-9d54-47f9-b48a-36268278c2ee
  2. cpe:2.3:o:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 2
    Logic
    OR
    Version bounds
    from including 6.7.0; through excluding 6.7.0.2
    Match ID
    05a1a309-650a-4e6c-afce-cd0fb62492d6
  3. cpe:2.3:o:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 0
    Logic
    OR
    Version bounds
    through excluding 6.4.0.12
    Match ID
    2449a498-7072-4c05-8ba9-614a950b3c3e

Affected-product evidence

Accepted scope and product mapping

2 canonical links · 1 source-reported links

Mapping establishedEvidence supported

vendor-0774b265c0e837e737aaf99ed0f2450c048e61f34267ca59d8623878b839334e · product-13f1bd4dd017fa483ac95529d418ebd255c9ece9a794658a77bfe0471ab82e89

Source class
Nvd cpe vulnerable target
Assertions
3
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
080165ce-0041-40b6-8ceb-07bba89c45ce89d9be61-f3ee-4b85-b4b6-4dca770ca253ad01b69b-f57e-4db6-9cad-f6bc12acf39f
Mapping establishedEvidence supported

vendor-0774b265c0e837e737aaf99ed0f2450c048e61f34267ca59d8623878b839334e · product-4f9b01b0d2b49f62a97941ed22de23d9f3ec08f598a5617c413c154933c87a27

Source class
Nvd cpe vulnerable target
Assertions
6
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
5e5a0826-112f-48a9-b88f-67b9a07a4f5e6c1d05ee-a1d1-4c7b-a42a-0dee4904bff6867a1791-de85-4aa1-8724-eea068a176bf8af0711f-70b8-49d5-a09d-fcdf16e3b042b7d880b8-cf5f-4fa7-8f5d-9ac4847aefd2deb8dbeb-57cc-400e-8c8f-9b3d0d53ce75
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
2367b2ff-9801-4f3d-a55c-64b0e5621e07

Assessments

CVSS by origin

6.1
NVDCVSS 3.1 · role Primary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
2.6
NVDCVSS 2.0 · role Primary · priority eligiblevalid_matchAV:N/AC:H/Au:N/C:N/I:P/A:N
6.1
psirt@cisco.comCVSS 3.1 · role Secondary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1
ciscoCVSS 3.1 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Direct CVE/CNA normalized decisions

6.1Priority eligible

cisco

CVSS 3.1 · Primary · Original assertion · rank 1

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Validation
Valid match
Recomputed
6.1
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.