CVE-2021-37706

CRITICAL
Published Dec 22, 20214y ago · Modified Jun 17, 20262w ago
9.8 CVSS 3.1
Critical
Find Similar
Published Dec 22, 2021 4y ago
Last Modified Jun 17, 2026 2w ago

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. 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.

CVSS Details

Base Score
9.8
Exploitability
3.9
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

No active exploitation signals — not in CISA KEV and no EPSS score yet.

Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-191

Affected Products 20

VendorProductVersionRange
teluupjsip* ≤2.11.1
asteriskcertified_asterisk* <16.8.0
asteriskcertified_asterisk16.8.0any
asteriskcertified_asterisk16.8.0any
asteriskcertified_asterisk16.8.0any
asteriskcertified_asterisk16.8.0any
asteriskcertified_asterisk16.8.0any
asteriskcertified_asterisk16.8.0any
asteriskcertified_asterisk16.8.0any
asteriskcertified_asterisk16.8.0any
asteriskcertified_asterisk16.8.0any
asteriskcertified_asterisk16.8.0any
asteriskcertified_asterisk16.8.0any
asteriskcertified_asterisk16.8.0any
asteriskcertified_asterisk16.8.0any
sangomaasterisk*≥16.0.0  –  <16.24.1
sangomaasterisk*≥18.0.0  –  <18.10.1
sangomaasterisk*≥19.0.0  –  <19.2.1
debiandebian_linux9.0any
debiandebian_linux10.0any

References 10

  • packetstormsecurity.com http://packetstormsecurity.com/files/166225/Asterisk-Project-Security-Advisory-AST-2022-004.html
    Third Party AdvisoryVDB Entry
  • seclists.org http://seclists.org/fulldisclosure/2022/Mar/0
    Mailing ListPatchThird Party Advisory
  • github.com https://github.com/pjsip/pjproject/commit/15663e3f37091069b8c98a7fce680dc04bc8e865
    PatchThird Party Advisory
  • github.com https://github.com/pjsip/pjproject/security/advisories/GHSA-2qpg-f6wf-w984
    PatchThird Party Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2022/03/msg00035.html
    Mailing ListThird Party Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2022/11/msg00021.html
    Mailing ListThird Party Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2023/08/msg00038.html
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2024/09/msg00030.html
  • security.gentoo.org https://security.gentoo.org/glsa/202210-37
    Third Party Advisory
  • debian.org https://www.debian.org/security/2022/dsa-5285
    Third Party Advisory

Remediation

  • seclists.org http://seclists.org/fulldisclosure/2022/Mar/0
    Mailing ListPatchThird Party Advisory
  • github.com https://github.com/pjsip/pjproject/commit/15663e3f37091069b8c98a7fce680dc04bc8e865
    PatchThird Party Advisory
  • github.com https://github.com/pjsip/pjproject/security/advisories/GHSA-2qpg-f6wf-w984
    PatchThird Party Advisory