CASCACascade Atlas

Evidence dossier

CVE-2026-20230

Cisco Unified Communications Manager Server-Side Request Forgery Vulnerability

74.4–89.4Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

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%
CISA KEVCatalog member

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

FIRST EPSS41.69%

2026-07-18 · v2026.06.15 · percentile 98.5%

Source stateNo scored conflict

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

ciscooriginal assertion
container

Cisco Unified Communications Manager Server-Side Request Forgery Vulnerability

CISA KEVoriginal assertion
observed_exploitation

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

FIRST EPSSoriginal assertion
model_probability

Probability 0.416940000000; percentile 0.985310000000

Applicability

Cited product scope

Trace impact →
CiscoCisco Unified Communications Manager
[{"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"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:-:*:*:*; start including 14.0; end excluding 14su6supported
Unknown vendorUnknown product
cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:-:*:*:*; start including 15.0; end including 15su4asupported
Unknown vendorUnknown product
cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:session_management:*:*:*; start including 14.0; end excluding 14su6supported
Unknown vendorUnknown product
cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:session_management:*:*:*; start including 15.0; end including 15su4asupported

Assessments

CVSS by origin

8.6
psirt@cisco.comCVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
8.6
ciscoCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

Limitations and unknowns

  • 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; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • 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.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.