# CVE-2011-2562: Denial of service in n/a

> Remote attackers can cause a service outage in Cisco Unified Communications Manager by sending a malicious SIP INVITE message.

- **Severity:** High 7.8 (`AV:N/AC:L/Au:N/C:N/I:N/A:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 29 Aug 2011
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-838r-v649-h68x

## What is CVE-2011-2562?

CVE-2011-2562 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

Unspecified vulnerability in Cisco Unified Communications Manager (aka CUCM, formerly CallManager) 6.x before 6.1(5)su2, 7.x before 7.1(5b)su3, 8.x before 8.0(3a)su1, and 8.5 before 8.5(1) allows remote attackers to cause a denial of service (service outage) via a SIP INVITE message, aka Bug ID CSCth43256.

## Which versions are affected by CVE-2011-2562?

It affects 1 product.


Products: Cisco Unified Communications Manager.

## How do I fix CVE-2011-2562?

No fix has been published for CVE-2011-2562 yet. Limit exposure of the affected software until one is available.

## Is CVE-2011-2562 being exploited?

There is no known exploitation of CVE-2011-2562 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Unified Communications Manager

- [CVE-2026-20230](https://insights.sbomify.com/CVE-2026-20230/): Cisco Unified Communications Manager Server-Side Request Forgery (SSRF) (high 8.6, exploited in the wild)
- [CVE-2026-20045](https://insights.sbomify.com/CVE-2026-20045/): Cisco Unified Communications Products Code Injection (high 8.2, exploited in the wild)
- [CVE-2025-20309](https://insights.sbomify.com/CVE-2025-20309/): Cisco Unified Communications Manager Static SSH Credentials Vulnerability (critical 10.0)
- [CVE-2011-1643](https://insights.sbomify.com/CVE-2011-1643/): Information disclosure in n/a (critical 10.0)
- [CVE-2024-20253](https://insights.sbomify.com/CVE-2024-20253/): Deserialization in Cisco Packaged Contact Center Enterprise (critical 9.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2011-2562 and fix it if it is affected.

What it is: CVE-2011-2562 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.
Exploitation: There is no known exploitation of CVE-2011-2562 in the wild and no public exploit code.

Affected product: Cisco Unified Communications Manager. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2011-2562/ (Markdown: https://insights.sbomify.com/CVE-2011-2562/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2011-2562
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2011-2562
- OSV: https://osv.dev/vulnerability/CVE-2011-2562

---
From sbomify Insights: https://insights.sbomify.com/CVE-2011-2562/
Summaries are generated and may contain mistakes; the official description above is the record.