CVE-2026-20230High· 8.6▾ Abyssal⚠ Exploited in the wildPoC availableA 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 forg…
▾ Abyssal zone — Critical with a public exploit or in-the-wild use
impact 47.3 · likelihood 17.6 · exploitation 25
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 1 source. Availability, not in-the-wild use.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Federal remediation due Jun 28, 2026
Last analysed / modified upstream
88%
3 GitHub repos (last check)
Added to the CISA catalog on Jun 25, 2026. Federal remediation due Jun 28, 2026. View catalog ↗
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.
unified_communications_manager >= 14.0, < 14su6unified_communications_manager >= 15.0, <= 15su4aUpgrade past the affected range:
unified_communications_manager 14su6Connected by shared product, vendor, weakness, or advisory.
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