CVE-2011-2561 Denial of service in n/a
Remote attackers can cause a service outage in Cisco Unified Communications Manager by sending crafted SIP calls using the g729ar8 codec.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2011-2561?
CVE-2011-2561 is a high-severity denial of service vulnerability in Cisco Unified Communications Manager, published on 29 Aug 2011. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The SIP process in Cisco Unified Communications Manager (aka CUCM, formerly CallManager) 7.x before 7.1(5b)su4 and 8.x before 8.0(1) does not properly handle SDP data within a SIP call in certain situations related to use of the g729ar8 codec for a Media Termination Point (MTP), which allows remote attackers to cause a denial of service (service outage) via a crafted call, aka Bug ID CSCtc61990.
Weakness: CWE-399
Which versions are affected by CVE-2011-2561?
It affects 1 product.
Products include Cisco Unified Communications Manager.
How do I fix CVE-2011-2561?
No fix has been published for CVE-2011-2561 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2011-2561 being exploited?
There is no known exploitation of CVE-2011-2561 in the wild and no public exploit code.
Other vulnerabilities in Cisco Unified Communications Manager
- CVE-2026-20230 Cisco Unified Communications Manager Server-Side Request Forgery (SSRF)
- CVE-2026-20045 Cisco Unified Communications Products Code Injection
- CVE-2025-20309 Cisco Unified Communications Manager Static SSH Credentials Vulnerability
- CVE-2011-1643 Information disclosure in n/a
- CVE-2024-20253 Deserialization in Cisco Packaged Contact Center Enterprise
Sources
Also known as GHSA-jxqj-hhh8-m26w.