CVE-2021-37706
What it is
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. In affected versions if the incoming STUN message contains an ERROR-CODE attribute, the header length is not checked before performing a subtraction operation, potentially resulting in an integer underflow scenario. This issue affects all users that use STUN. A malicious actor located within the victim’s network may forge and send a specially crafted UDP (STUN) message that could remotely execute arbitrary code on the victim’s machine. Users are advised to upgrade as soon as possible. There are no known workarounds.
At a glance
- Exploitability
- Can be exploited over the network without logging in. Limited direct impact.
- Exploit odds
- 4.9% chance of exploitation in the next 30 days (EPSS).
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 4.9% in the next 30 days (EPSS).
- Severity: 7.3 HIGH (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 4.9% · EPSS, next 30 days
- Weakness
- CWE-191
- Record status
- Modified
Affected
- Teluu Pjsip ≤ 2.11.1
- Asterisk Certified Asterisk < 16.8.0
- Asterisk Certified Asterisk 16.8.0
- Sangoma Asterisk < 16.24.1
- Sangoma Asterisk < 18.10.1
- Sangoma Asterisk < 19.2.1
- Debian Linux 9.0
- Debian Linux 10.0
Attack profile CVSS 3.1 · 7.3
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2021-37706.md and follow it. Check whether this project is affected by CVE-2021-37706. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- http://seclists.org/fulldisclosure/2022/Mar/0
- https://github.com/pjsip/pjproject/commit/15663e3f37091069b8c98a7fce680dc04bc8e865
- https://github.com/pjsip/pjproject/security/advisories/GHSA-2qpg-f6wf-w984
- http://seclists.org/fulldisclosure/2022/Mar/0
- https://github.com/pjsip/pjproject/commit/15663e3f37091069b8c98a7fce680dc04bc8e865
- https://github.com/pjsip/pjproject/security/advisories/GHSA-2qpg-f6wf-w984
References
- http://packetstormsecurity.com/files/166225/Asterisk-Project-Security-Advisory-AST-2022-004.html
- http://seclists.org/fulldisclosure/2022/Mar/0
- https://github.com/pjsip/pjproject/commit/15663e3f37091069b8c98a7fce680dc04bc8e865
- https://github.com/pjsip/pjproject/security/advisories/GHSA-2qpg-f6wf-w984
- https://lists.debian.org/debian-lts-announce/2022/03/msg00035.html
- https://lists.debian.org/debian-lts-announce/2022/11/msg00021.html
- https://lists.debian.org/debian-lts-announce/2023/08/msg00038.html
- https://security.gentoo.org/glsa/202210-37
- https://www.debian.org/security/2022/dsa-5285
- http://packetstormsecurity.com/files/166225/Asterisk-Project-Security-Advisory-AST-2022-004.html
- http://seclists.org/fulldisclosure/2022/Mar/0
- https://github.com/pjsip/pjproject/commit/15663e3f37091069b8c98a7fce680dc04bc8e865
- https://github.com/pjsip/pjproject/security/advisories/GHSA-2qpg-f6wf-w984
- https://lists.debian.org/debian-lts-announce/2022/03/msg00035.html
- https://lists.debian.org/debian-lts-announce/2022/11/msg00021.html
- https://lists.debian.org/debian-lts-announce/2023/08/msg00038.html
- https://lists.debian.org/debian-lts-announce/2024/09/msg00030.html
- https://security.gentoo.org/glsa/202210-37
- https://www.debian.org/security/2022/dsa-5285