CASCACascade Atlas

Evidence dossier

CVE-2026-20045

Cisco Unified Communications Products Remote Code Execution Vulnerability

64.7–83.7Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

A vulnerability in Cisco Unified Communications Manager (Unified CM), Cisco Unified Communications Manager Session Management Edition (Unified CM SME), Cisco Unified Communications Manager IM & Presence Service (Unified CM IM&P), Cisco Unity Connection, and Cisco Webex Calling Dedicated Instance could allow an unauthenticated, remote attacker to execute arbitrary commands on the underlying operating system of an affected device.  This vulnerability is due to improper validation of user-supplied input in HTTP requests. An attacker could exploit this vulnerability by sending a sequence of crafted HTTP requests to the web-based management interface of an affected device. A successful exploit could allow the attacker to obtain user-level access to the underlying operating system and then elevate privileges 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.

State
PUBLISHED
Published
Jan 21, 2026
Updated
Feb 26, 2026
Evidence coverage
72%
CISA KEVCatalog member

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

FIRST EPSS4.31%

2026-07-18 · v2026.06.15 · percentile 90.1%

Source stateConflict visible

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 Products Remote Code Execution Vulnerability

CISA KEVoriginal assertion
observed_exploitation

Cisco Unified Communications Products Code Injection Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.043070000000; percentile 0.900610000000

Applicability

Cited product scope

Trace impact →
CiscoCisco Unified Communications Manager
[{"status": "affected", "version": "12.5(1)SU2"}, {"status": "affected", "version": "12.5(1)SU1"}, {"status": "affected", "version": "12.5(1)"}, {"status": "affected", "version": "12.5(1)SU3"}, {"status": "affected", "version": "12.5(1)SU4"}, {"status": "affected", "version": "14"}, {"status": "affected", "version": "12.5(1)SU5"}, {"status": "affected", "version": "14SU1"}, {"status": "affected", "version": "12.5(1)SU6"}, {"status": "affected", "version": "14SU2"}, {"status": "affected", "version": "12.5(1)SU7"}, {"status": "affected", "version": "12.5(1)SU7a"}, {"status": "affected", "version": "14SU3"}, {"status": "affected", "version": "12.5(1)SU8"}, {"status": "affected", "version": "12.5(1)SU8a"}, {"status": "affected", "version": "15"}, {"status": "affected", "version": "15SU1"}, {"status": "affected", "version": "14SU4"}, {"status": "affected", "version": "14SU4a"}, {"status": "affected", "version": "15SU1a"}, {"status": "affected", "version": "12.5(1)SU9"}, {"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"}]unknown
CiscoCisco Unified Communications Manager IM and Presence Service
[{"status": "affected", "version": "12.5(1)"}, {"status": "affected", "version": "12.5(1)SU1"}, {"status": "affected", "version": "12.5(1)SU2"}, {"status": "affected", "version": "12.5(1)SU3"}, {"status": "affected", "version": "12.5(1)SU4"}, {"status": "affected", "version": "14"}, {"status": "affected", "version": "12.5(1)SU5"}, {"status": "affected", "version": "14SU1"}, {"status": "affected", "version": "12.5(1)SU6"}, {"status": "affected", "version": "14SU2"}, {"status": "affected", "version": "14SU2a"}, {"status": "affected", "version": "12.5(1)SU7"}, {"status": "affected", "version": "14SU3"}, {"status": "affected", "version": "12.5(1)SU8"}, {"status": "affected", "version": "15"}, {"status": "affected", "version": "15SU1"}, {"status": "affected", "version": "14SU4"}, {"status": "affected", "version": "12.5(1)SU9"}, {"status": "affected", "version": "15SU2"}, {"status": "affected", "version": "15SU3"}]unknown
CiscoCisco Unity Connection
[{"status": "affected", "version": "12.5(1)"}, {"status": "affected", "version": "12.5(1)SU1"}, {"status": "affected", "version": "12.5(1)SU2"}, {"status": "affected", "version": "12.5(1)SU3"}, {"status": "affected", "version": "12.5(1)SU4"}, {"status": "affected", "version": "14"}, {"status": "affected", "version": "12.5(1)SU5"}, {"status": "affected", "version": "14SU1"}, {"status": "affected", "version": "12.5(1)SU6"}, {"status": "affected", "version": "14SU2"}, {"status": "affected", "version": "12.5(1)SU7"}, {"status": "affected", "version": "14SU3"}, {"status": "affected", "version": "12.5(1)SU8"}, {"status": "affected", "version": "14SU3a"}, {"status": "affected", "version": "12.5(1)SU8a"}, {"status": "affected", "version": "15"}, {"status": "affected", "version": "15SU1"}, {"status": "affected", "version": "14SU4"}, {"status": "affected", "version": "12.5(1)SU9"}, {"status": "affected", "version": "15SU2"}, {"status": "affected", "version": "15SU3"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:-:*:*:*; start including 12.5; end excluding 14su5supported
Unknown vendorUnknown product
cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:-:*:*:*; start including 15.0; end including 15su3asupported
Unknown vendorUnknown product
cpe:2.3:a:cisco:unified_communications_manager_im_and_presence_service:*:*:*:*:*:*:*:*; start including 12.5; end excluding 14su5supported
Unknown vendorUnknown product
cpe:2.3:a:cisco:unified_communications_manager_im_and_presence_service:*:*:*:*:*:*:*:*; start including 15.0; end including 15su3asupported
Unknown vendorUnknown product
cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:session_management:*:*:*; start including 12.5; end excluding 14su5supported
Unknown vendorUnknown product
cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:session_management:*:*:*; start including 15.0; end including 15su3asupported
Unknown vendorUnknown product
cpe:2.3:a:cisco:unity_connection:*:*:*:*:*:*:*:*; start including 12.5; end excluding 14su5supported
Unknown vendorUnknown product
cpe:2.3:a:cisco:unity_connection:*:*:*:*:*:*:*:*; start including 15.0; end including 15su3supported

Assessments

CVSS by origin

9.8
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.2
psirt@cisco.comCVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
8.2
ciscoCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/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.