# CVE-2022-20968: Memory corruption in Cisco Session Initiation Protocol (SIP) Software

> An unauthenticated adjacent attacker can cause a stack overflow via crafted CDP packets, leading to remote code execution or denial of service on Cisco IP phones.

- **Severity:** High 8.1 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Dec 2022
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-39vj-2wxm-c37w

## What is CVE-2022-20968?

CVE-2022-20968 is a high-severity memory corruption vulnerability in Cisco Session Initiation Protocol (SIP) Software, published on 8 Dec 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability in the Cisco Discovery Protocol processing feature of Cisco IP Phone 7800 and 8800 Series firmware could allow an unauthenticated, adjacent attacker to cause a stack overflow on an affected device.

This vulnerability is due to insufficient input validation of received Cisco Discovery Protocol packets. An attacker could exploit this vulnerability by sending crafted Cisco Discovery Protocol traffic to an affected device. A successful exploit could allow the attacker to cause a stack overflow, resulting in possible remote code execution or a denial of service (DoS) condition on an affected device.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2022-20968?

It affects 13 products.


Products: Cisco Ip Phone 7811 Firmware, Cisco Ip Phone 7821 Firmware, Cisco Ip Phone 7832 Firmware, Cisco Ip Phone 7841 Firmware, Cisco Ip Phone 7861 Firmware, Cisco Ip Phone 8811 Firmware, Cisco Ip Phone 8831 Firmware, Cisco Ip Phone 8832 Firmware, Cisco Ip Phone 8841 Firmware, Cisco Ip Phone 8845 Firmware, Cisco Ip Phone 8851 Firmware, Cisco Ip Phone 8861 Firmware, Cisco Ip Phone 8865 Firmware.

## How do I fix CVE-2022-20968?

No fix has been published for CVE-2022-20968 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-20968 being exploited?

There is no known exploitation of CVE-2022-20968 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-20968 and fix it if it is affected.

What it is: CVE-2022-20968 is a high-severity memory corruption vulnerability in Cisco Session Initiation Protocol (SIP) Software, published on 8 Dec 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2022-20968 in the wild and no public exploit code.

Affected product: Cisco Session Initiation Protocol (SIP) Software. 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-2022-20968/ (Markdown: https://insights.sbomify.com/CVE-2022-20968/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-20968
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-20968
- OSV: https://osv.dev/vulnerability/CVE-2022-20968

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-20968/
Summaries are generated and may contain mistakes; the official description above is the record.