CVE-2021-37706 — Integer Underflow (Wrap or Wraparound) in Pjproject

CWE-191 — Integer Underflow (Wrap or Wraparound)9 documents4 sources
Severity
9.8CRITICALNVD
EPSS
0.2%
top 52.38%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
7
Sangoma AsteriskAsterisk Certified AsteriskPjsip Pjproject+4 more
Timeline
PublishedDec 22
Latest updateMar 24

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 sen…

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 3.9 | Impact: 5.9

Affected Packages8 packages

▶Ubuntupjsip/pjproject< 2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1+1
▶NVDteluu/pjsip2.11.1
▶CVEListV5pjsip/pjproject2.11.1
▶debiandebian/ring< asterisk 1:16.28.0~dfsg-0+deb11u1 (bullseye)
▶debiandebian/asterisk< asterisk 1:16.28.0~dfsg-0+deb11u1 (bullseye)

Also affects: Debian Linux 10.0, 9.0

Patches

Patch: seclists.org ↗Patch: github.com ↗Patch: github.com ↗

🔴Vulnerability Details

4
OSV
pjproject vulnerabilities↗2026-03-24
▶
OSV
ring vulnerabilities↗2023-10-24
▶
OSV
ring vulnerabilities↗2023-10-09
▶
OSV
CVE-2021-37706: PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, ST↗2021-12-22
▶

📋Vendor Advisories

4
Ubuntu
PJSIP vulnerabilities↗2026-03-24
▶
Ubuntu
Ring vulnerabilities↗2023-10-24
▶
Ubuntu
Ring vulnerabilities↗2023-10-09
▶
Debian
CVE-2021-37706: asterisk - PJSIP is a free and open source multimedia communication library written in C la...↗2021
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CVE-2021-37706 — Integer Underflow (Wrap or Wraparound) | cvebase