Cisco Unified Communications Manager Server-Side Request Forgery (SSRF) Vulnerability
CiscoUnified Communications Manager
- Exploited in the wild
- In CISA KEV since 25 Jun
- Vendor fix available
Passed 118 days ago
CISA KEV · added 25 Jun
Higher than 100% of scored CVEs
Description NVD
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.
CISA required action
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.
Coverage 16 articles · 7 outlets
See the full timelineShow as table
- Cisco Warns of Exploit in Manager SSRF Flaw CVE-2026-20230SecurityWeek
- Cisco Unified CM RCE Flaw Exploited in the Wild as PoC Code Goes PublicSecurityOnline
- Cisco SD-WAN Zero-Day Exploited in AttacksSecurityOnline · mentions it in passing
- CISA adds critical PTC Windchill, Cisco UC flaws to KEV listSecurity Affairs · mentions it in passing
- CISA Adds Cisco UC Manager SSRF Flaw to KEV CatalogCISA · official notice
- PTC Windchill flaw spotted; Claude Fable 5 hints at AWS returnSecurityOnline · mentions it in passing
- Cisco and PTC flaws under active attack, CISA adds to KEV listSecurityOnline
- Cisco CUCM flaw allows hackers to gain root access in 24 hoursDark Reading
- Cisco Manager SSRF Flaw Exploited, CISA Adds CVE‑2026‑20230 to KEVCISA · official notice
- Cisco CUCM CVE-2026-20230 SSRF flaw lets attackers gain rootSecurity Affairs
- Cisco Unified CM flaw lets hackers gain root access via SSRFSecurityWeek
- Cisco patches SSRF flaw in Unified CM enabling root accessSOCRadar
- Cisco Patches CVE-2026-20230 in Unified CM as Exploit Code Goes PublicThe Hacker News
- Cisco Fixes CVE-2026-20230 SSRF Flaw in Unified CM, Root Risk.Security Affairs
- Cisco patches CVE-2026-20230 UC Manager flaw enabling root accessSecurityWeek
- Cisco Unified CM SSRF flaw exposes systems to remote takeoverSecurityOnline · first in our coverage