CASCACascade Atlas

Evidence dossier

CVE-2026-20230

Cisco Unified Communications Manager Server-Side Request Forgery Vulnerability

Exploited in the wild (CISA KEV since Jun 25, 2026). cisco reports CVSS 3.1 8.6. EPSS estimates 88.2% exploit likelihood as of Aug 27, 2026.

80.3–87.1Priority evidence range
Evidence current through Aug 27, 2026, 6:09 PM UTC

As of Aug 27, 2026

Normalized restatement

A vulnerability in Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) could allow an unauthenticated, remote attacker to conduct server-side request forgery (SSRF) attacks through an affected device. This vulnerability is due to improper input validation for specific HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to write files to the underlying operating system that could be used later to elevate to root. Note: Cisco has assigned this security advisory a Security Impact Rating (SIR) of Critical rather than High as the score indicates. The reason is that exploitation of this vulnerability could result in an attacker elevating privileges to root. Note: To exploit this vulnerability, the WebDialer service must be enabled. WebDialer is disabled by default.

State
PUBLISHED
Published
Jun 3, 2026
Updated
Jul 1, 2026
Evidence coverage
85%

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 Unified Communications Manager Server-Side Request Forgery Vulnerability

    Inspect raw assertion
    Field
    container
    Value
    Cisco Unified Communications Manager Server-Side Request Forgery Vulnerability
    Original evidence ↗
  3. Source dateFirst observed by CASCA
    CISA KEV

    Exploitation cataloged: Cisco Unified Communications Manager Server-Side Request Forgery (SSRF) Vulnerability

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    Cisco Unified Communications Manager Server-Side Request Forgery (SSRF) Vulnerability
    Original evidence ↗
  4. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 88.2% probability · 99.76th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.882000000000; percentile 0.997550000000
    Original evidence ↗
ExploitationCatalog member

CISA KEV · catalog date Jun 25, 2026 · first observed Jul 19, 2026

Exploit likelihood88.20%

FIRST EPSS · score date Aug 27, 2026 · 99.8th percentile · first observed Aug 27, 2026

SeverityCVSS 8.6

cisco · 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 Unified Communications Manager Server-Side Request Forgery Vulnerability

Inspect raw assertion
Field
container
Value
Cisco Unified Communications Manager Server-Side Request Forgery Vulnerability
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CISA KEVOriginal assertion
Exploitation cataloged

Cisco Unified Communications Manager Server-Side Request Forgery (SSRF) Vulnerability

Inspect raw assertion
Field
observed_exploitation
Value
Cisco Unified Communications Manager Server-Side Request Forgery (SSRF) Vulnerability
Source dateFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

88.2% probability · 99.76th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.882000000000; percentile 0.997550000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
4Underlying assertions
1Canonical products
4Target 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

cisco · source assertedCiscoCisco Unified Communications ManagerDirect source scope
Affected: 14Affected: 14SU1Affected: 14SU2Affected: 14SU3Affected: 15Affected: 15SU1Affected: 14SU4Affected: 14SU4aAffected: 15SU1aAffected: 15SU2Affected: 15.0.1.13010-1Affected: 15.0.1.13011-1Affected: 15.0.1.13012-1Affected: 15.0.1.13013-1Affected: 15.0.1.13014-1Affected: 15.0.1.13015-1Affected: 15.0.1.13016-1Affected: 15.0.1.13017-1Affected: 15SU3aAffected: 14SU5Affected: 15SU4Affected: 15SU4a
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "14"}, {"status": "affected", "version": "14SU1"}, {"status": "affected", "version": "14SU2"}, {"status": "affected", "version": "14SU3"}, {"status": "affected", "version": "15"}, {"status": "affected", "version": "15SU1"}, {"status": "affected", "version": "14SU4"}, {"status": "affected", "version": "14SU4a"}, {"status": "affected", "version": "15SU1a"}, {"status": "affected", "version": "15SU2"}, {"status": "affected", "version": "15.0.1.13010-1"}, {"status": "affected", "version": "15.0.1.13011-1"}, {"status": "affected", "version": "15.0.1.13012-1"}, {"status": "affected", "version": "15.0.1.13013-1"}, {"status": "affected", "version": "15.0.1.13014-1"}, {"status": "affected", "version": "15.0.1.13015-1"}, {"status": "affected", "version": "15.0.1.13016-1"}, {"status": "affected", "version": "15.0.1.13017-1"}, {"status": "affected", "version": "15SU3a"}, {"status": "affected", "version": "14SU5"}, {"status": "affected", "version": "15SU4"}, {"status": "affected", "version": "15SU4a"}]
NVD CPE · APPLICATIONciscounified_communications_managerVulnerable target · 4 assertions
Any version (unconstrained) (>= 14.0, < 14su6); Any version (unconstrained) (>= 15.0, <= 15su4a)Canonical identity product-54fee77d40dd7771ad0e84af29bd7f6cdcf7db09a6aaa9bb1b2b75a1aa9f75f3Linked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:-:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 0
    Logic
    OR
    Version bounds
    from including 14.0; through excluding 14su6
    Match ID
    9e708402-3d51-4165-8a97-2b3e68116553
  2. cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:-:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 2
    Logic
    OR
    Version bounds
    from including 15.0; through including 15su4a
    Match ID
    efbe275e-8043-4f8b-abe8-48774cf11648
  3. cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:session_management:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 3
    Logic
    OR
    Version bounds
    from including 15.0; through including 15su4a
    Match ID
    06300542-9590-4fe0-8054-7bd15b2cb3ba
  4. cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:session_management:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 1
    Logic
    OR
    Version bounds
    from including 14.0; through excluding 14su6
    Match ID
    321d5cc9-ecfc-42fd-aab4-465e3bc399da

Affected-product evidence

Accepted scope and product mapping

0 canonical links · 2 source-reported links

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
f12b7b06-ca50-46eb-babc-047bff7a5527
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
Nvd cpe vulnerable target
Assertions
4
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
034a08a2-6618-46f9-b714-72f2eb4e656c195bf0f7-d494-430c-bb18-1f53ab6e8c56480c8319-3680-4373-ab47-4bdb6933eb00b61296ac-b1ec-4909-bae5-bad5d127f1db

Assessments

CVSS by origin

8.6
psirt@cisco.comCVSS 3.1 · role Secondary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
8.6
ciscoCVSS 3.1 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

Direct CVE/CNA normalized decisions

8.6Priority eligible

cisco

CVSS 3.1 · Primary · Original assertion · rank 1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
Validation
Valid match
Recomputed
8.6
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.