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TI-2026-16259 Aliases CVE-2026-20045GHSA-h4w3-hxw6-99q7

Cisco Unified Communications Products Remote Code Execution Vulnerability

Priority CRITICAL 100Exploited in the wildCWE-94Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-94.

Summary

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.

Why it matters now

Exploitation Active In CISA KEV since 2026-01-21CISA due date 2026-02-11
EPSS 0.04541 91st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Active
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CiscoCisco Unified Communications Manager12.5(1)SU2; 12.5(1)SU1; 12.5(1); 12.5(1)SU3; 12.5(1)SU4; 14; 12.5(1)SU5; 14SU1; 12.5(1)SU6; 14SU2; 12.5(1)SU7; 12.5(1)SU7a; 14SU3; 12.5(1)SU8; 12.5(1)SU8a; 15; 15SU1; 14SU4; 14SU4a; 15SU1a; 12.5(1)SU9; 15SU2; 15.0.1.13010-1; 15.0.1.13011-1; 15.0.1.13012-1; 15.0.1.13013-1; 15.0.1.13014-1; 15.0.1.13015-1; 15.0.1.13016-1; 15.0.1.13017-1; 15SU3a—No fix listedCNA
CiscoCisco Unified Communications Manager IM and Presence Service12.5(1); 12.5(1)SU1; 12.5(1)SU2; 12.5(1)SU3; 12.5(1)SU4; 14; 12.5(1)SU5; 14SU1; 12.5(1)SU6; 14SU2; 14SU2a; 12.5(1)SU7; 14SU3; 12.5(1)SU8; 15; 15SU1; 14SU4; 12.5(1)SU9; 15SU2; 15SU3—No fix listedCNA
CiscoCisco Unity Connection12.5(1); 12.5(1)SU1; 12.5(1)SU2; 12.5(1)SU3; 12.5(1)SU4; 14; 12.5(1)SU5; 14SU1; 12.5(1)SU6; 14SU2; 12.5(1)SU7; 14SU3; 12.5(1)SU8; 14SU3a; 12.5(1)SU8a; 15; 15SU1; 14SU4; 12.5(1)SU9; 15SU2; 15SU3—No fix listedCNA
  • Cisco Unified Communications Manager VendorCisco Affected 12.5(1)SU2; 12.5(1)SU1; 12.5(1); 12.5(1)SU3; 12.5(1)SU4; 14; 12.5(1)SU5; 14SU1; 12.5(1)SU6; 14SU2; 12.5(1)SU7; 12.5(1)SU7a; 14SU3; 12.5(1)SU8; 12.5(1)SU8a; 15; 15SU1; 14SU4; 14SU4a; 15SU1a; 12.5(1)SU9; 15SU2; 15.0.1.13010-1; 15.0.1.13011-1; 15.0.1.13012-1; 15.0.1.13013-1; 15.0.1.13014-1; 15.0.1.13015-1; 15.0.1.13016-1; 15.0.1.13017-1; 15SU3a Fixed in — No fix listed CNA
  • Cisco Unified Communications Manager IM and Presence Service VendorCisco Affected 12.5(1); 12.5(1)SU1; 12.5(1)SU2; 12.5(1)SU3; 12.5(1)SU4; 14; 12.5(1)SU5; 14SU1; 12.5(1)SU6; 14SU2; 14SU2a; 12.5(1)SU7; 14SU3; 12.5(1)SU8; 15; 15SU1; 14SU4; 12.5(1)SU9; 15SU2; 15SU3 Fixed in — No fix listed CNA
  • Cisco Unity Connection VendorCisco Affected 12.5(1); 12.5(1)SU1; 12.5(1)SU2; 12.5(1)SU3; 12.5(1)SU4; 14; 12.5(1)SU5; 14SU1; 12.5(1)SU6; 14SU2; 12.5(1)SU7; 14SU3; 12.5(1)SU8; 14SU3a; 12.5(1)SU8a; 15; 15SU1; 14SU4; 12.5(1)SU9; 15SU2; 15SU3 Fixed in — No fix listed CNA

CPE configurations NVD · 6

CPEVersionsRoleVendor
cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:-:*:*:*12.5 to before 14su5VulnerableCisco
cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:session_management:*:*:*12.5 to before 14su5VulnerableCisco
cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:-:*:*:*15.0 – 15su3aVulnerableCisco
cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:session_management:*:*:*15.0 – 15su3aVulnerableCisco
cpe:2.3:a:cisco:unified_communications_manager_im_and_presence_service:*:*:*:*:*:*:*:*12.5 to before 14su5; 15.0 – 15su3aVulnerableCisco
cpe:2.3:a:cisco:unity_connection:*:*:*:*:*:*:*:*12.5 to before 14su5; 15.0 – 15su3VulnerableCisco
  • cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:-:*:*:* Versions 12.5 to before 14su5 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:session_management:*:*:* Versions 12.5 to before 14su5 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:-:*:*:* Versions 15.0 – 15su3a Vulnerable ·Cisco
  • cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:session_management:*:*:* Versions 15.0 – 15su3a Vulnerable ·Cisco
  • cpe:2.3:a:cisco:unified_communications_manager_im_and_presence_service:*:*:*:*:*:*:*:* Versions 12.5 to before 14su5; 15.0 – 15su3a Vulnerable ·Cisco
  • cpe:2.3:a:cisco:unity_connection:*:*:*:*:*:*:*:* Versions 12.5 to before 14su5; 15.0 – 15su3 Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-01-21 Added to CISA KEV
  2. 2026-10-02 Threatist record created from CVE-2026-20045
  3. 2026-10-03 Alias added: GHSA-h4w3-hxw6-99q7

References

Advisory 1

  • TI-2021-19919 Apache Log4j2 JNDI features do not protect against attacker controlled LDAP and other JNDI related endpoints KEVCVSS 3.1CRITICAL 10.0
  • TI-2026-16423 Cisco Unified Communications Manager Server-Side Request Forgery Vulnerability KEVCVSS 3.1HIGH 8.6
  • TI-2008-00019 Heap-based buffer overflow in the Certificate Trust List (CTL) Provider service… CVSS 2.0HIGH 10.0
  • TI-2013-05779 The TFTP service in Cisco Unified Communications Manager (aka CUCM or Unified CM) allows… CVSS 3.1HIGH 7.3
  • TI-2011-02932 Directory traversal vulnerability in Cisco Unified Communications Manager (CUCM) 5.x and… CVSS 2.0HIGH 7.8
  • TI-2011-01424 SQL injection vulnerability in Cisco Unified Communications Manager (aka CUCM, formerly… CVSS 2.0HIGH 8.5
See all 238 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences