Cisco Unified Communications Manager Server-Side Request Forgery Vulnerability
Affects Cisco Unified Communications Manager and Unified CM SME devices with the WebDialer service enabled. No fixed release is listed in the checked facts.
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Actively exploited
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: active
- Automatable: no
- Technical impact: total
Summary
Cisco Unified Communications Manager and Cisco Unified Communications Manager Session Management Edition are affected, and an unauthenticated remote attacker could abuse them to make the server send forged requests, potentially writing files to the underlying operating system that could later be used to gain root-level control, though this requires the WebDialer service to be enabled.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
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.
Timeline
- CVE published
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- CISA SSVC assessment
Exploitation: active · Automatable: no · Technical impact: total
- CISA remediation deadline
Due date for US federal agencies to patch
- Record last updated
- EPSS reached 10%
FIRST estimates at least a 10% chance of exploitation in the next 30 days
Affected versions
- Cisco Cisco Unified Communications Manager
14, 14SU1, 14SU2, 14SU3, 15, 15SU1, 14SU4, 14SU4a, 15SU1a, 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, 14SU5, 15SU4, 15SU4a
References 1
sec.cloudapps.cisco.com
Questions about CVE-2026-20230
What does this mean?
The flaw is a server-side request forgery through an affected device. It can also let files be written to the underlying operating system, which could later be used to gain root.Source: sec.cloudapps.cisco.com
Am I affected, and how do I check?
The advisory covers Cisco Unified CM and Unified CM SME devices that have the WebDialer service enabled. To check a device, look at whether WebDialer is enabled on it.Source: sec.cloudapps.cisco.com
What should I do about it?
The checked facts do not list a fixed release, so no upgrade target is given. Check Cisco's advisory for the first fixed version.Source: sec.cloudapps.cisco.com
Is it being exploited?
Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2026-06-25, which means it has evidence of attacks. No public exploit code is tracked.Source: cisa.gov, cve.now feed data
What if there's no patch?
The checked facts give no workaround. The advisory ties the issue to the WebDialer service being enabled, so that service is the setting to review while no fix is available.Source: sec.cloudapps.cisco.com