Actively exploited in the wild
Cisco Unified Communications Manager Server-Side Request Forgery (SSRF) Vulnerability
Cisco - Unified Communications Manager · Listed in the CISA KEV since 2026-06-25. This indicates confirmed attacks in production environments.
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.
CVE-2026-20230
HighCVSS 8.6KEVExploitation Probability (EPSS)
Very high risk99th percentile - higher than 99% of all known CVEs
Summary
A vulnerability in Cisco Unified Communications Manager and Unified CM SME allows an unauthenticated remote attacker to perform SSRF attacks. The attacker can write files to the OS, potentially leading to root privilege escalation. WebDialer service must be enabled (disabled by default).
Risk Assessment
An attacker can gain OS access and escalate to root, leading to full device compromise and potentially the entire network.
Recommendation
Upgrade to the fixed version and disable WebDialer service if not needed.
Other vulnerabilities in Cisco Unified Communications Manager
See all- CVE-2017-6791High
A vulnerability in the Trust Verification Service (TVS) of Cisco Unified Communications Manager could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper handling of Transport Layer Security (TLS) traffic by the affected software.
- CVE-2017-6757High
A vulnerability in Cisco Unified Communications Manager 10.5(2.10000.5), 11.0(1.10000.10), and 11.5(1.10000.6) allows an authenticated, remote attacker to conduct a blind SQL injection attack. The issue is due to a failure to validate user-supplied input used in SQL queries that bypass protection filters.
- CVE-2016-6364High
The User Data Services (UDS) API implementation in Cisco Unified Communications Manager 11.5 allows remote attackers to bypass intended access restrictions and obtain sensitive information via unspecified API calls.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS