# CVE-2022-23547: Heap buffer overflow in pjproject when decoding STUN message

> A heap buffer overflow in PJSIP allows attackers to execute code or cause denial of service via crafted STUN messages.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 23 Dec 2022
- **Updated:** 4 Nov 2025
- **Also known as:** DEBIAN-CVE-2022-23547, UBUNTU-CVE-2022-23547

## What is CVE-2022-23547?

CVE-2022-23547 is a medium-severity memory corruption vulnerability in pjsip pjproject, published on 23 Dec 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. This issue is similar to GHSA-9pfh-r8x4-w26w. Possible buffer overread when parsing a certain STUN message. The vulnerability affects applications that uses STUN including PJNATH and PJSUA-LIB. The patch is available as commit in the master branch.

Weakness: CWE-125 (Out-of-bounds Read), CWE-122 (Heap-based Buffer Overflow)

## Which versions are affected by CVE-2022-23547?

It affects 1 product.


Products: Pjsip Pjsip.

## How do I fix CVE-2022-23547?

Apply the vendor's patch.

## Is CVE-2022-23547 being exploited?

There is no known exploitation of CVE-2022-23547 in the wild and no public exploit code.

## Other vulnerabilities in pjsip pjproject

- [CVE-2026-28799](https://insights.sbomify.com/CVE-2026-28799/): PJSIP: Heap use-after-free in PJSIP presence subscription termination handler (high 8.7)
- [CVE-2026-29068](https://insights.sbomify.com/CVE-2026-29068/): PJSIP: Stack buffer overflow in Opus codec parser (high 8.7)
- [CVE-2026-40614](https://insights.sbomify.com/CVE-2026-40614/): PJSIP: Heap buffer overflow in Opus codec decoding (high 8.5)
- [CVE-2026-32945](https://insights.sbomify.com/CVE-2026-32945/): PJSIP is vulnerable to Heap-based Buffer Overflow through DNS parser (high 8.4)
- [CVE-2026-40892](https://insights.sbomify.com/CVE-2026-40892/): PJSIP: Stack buffer overflow in pjsip_auth_create_digest2() (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-23547 and fix it if it is affected.

What it is: CVE-2022-23547 is a medium-severity memory corruption vulnerability in pjsip pjproject, published on 23 Dec 2022. 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-2022-23547 in the wild and no public exploit code.

Affected product: pjsip pjproject. 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-2022-23547/ (Markdown: https://insights.sbomify.com/CVE-2022-23547/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-23547
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-23547
- OSV: https://osv.dev/vulnerability/CVE-2022-23547

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-23547/
Summaries are generated and may contain mistakes; the official description above is the record.