1. Ubuntu Security Notices
  2. USN-8122-1

USN-8122-1: PJSIP vulnerabilities

Publication date

24 March 2026

Overview

Several security issues were fixed in PJSIP.

Releases

Packages

  • pjproject - multimedia communication library

Details

Youngsung Kim discovered that PJSIP did not properly parse numeric header
fields in SIP messages. A remote attacker could use this issue to cause
PJSIP to crash, resulting in a denial of service, or possibly execute
arbitrary code. This issue only affected Ubuntu 16.04 LTS. (CVE-2017-16872)

Peter Koletzki discovered that PJSIP did not properly handle certain
connection requests. A remote attacker could possibly use this issue to
cause PJSIP to enter an unrecoverable state and reject further connections,
resulting in a denial of service. This issue only affected Ubuntu 16.04
LTS. (CVE-2017-16875)

Alfred Farrugia, Sandro Gauci, and Kevin Harwell discovered that PJSIP did
not properly parse certain SDP messages. A remote attacker could possibly
use this issue to cause PJSIP to crash, resulting in a denial of service.
This issue only affected Ubuntu...

Youngsung Kim discovered that PJSIP did not properly parse numeric header
fields in SIP messages. A remote attacker could use this issue to cause
PJSIP to crash, resulting in a denial of service, or possibly execute
arbitrary code. This issue only affected Ubuntu 16.04 LTS. (CVE-2017-16872)

Peter Koletzki discovered that PJSIP did not properly handle certain
connection requests. A remote attacker could possibly use this issue to
cause PJSIP to enter an unrecoverable state and reject further connections,
resulting in a denial of service. This issue only affected Ubuntu 16.04
LTS. (CVE-2017-16875)

Alfred Farrugia, Sandro Gauci, and Kevin Harwell discovered that PJSIP did
not properly parse certain SDP messages. A remote attacker could possibly
use this issue to cause PJSIP to crash, resulting in a denial of service.
This issue only affected Ubuntu 16.04 LTS. (CVE-2018-1000098,
CVE-2018-1000099)

Lauri Vänskä discovered that PJSIP did not verify hostnames when reusing
TLS connections. If a remote attacker were able to intercept communication,
this flaw could possibly be exploited to view sensitive information.
(CVE-2020-15260)

It was discovered that PJSIP did not properly handle certain sequences of
SDP messages. A remote attacker could possibly use this issue to cause
PJSIP to crash, resulting in a denial of service. (CVE-2021-21375)

It was discovered that the SSL socket implementation in PJSIP contained a
race condition. A remote attacker could possibly use this issue to cause
PJSIP to crash, resulting in a denial of service. This issue was only
addressed in Ubuntu 18.04 LTS. (CVE-2021-32686)

It was discovered that PJSIP did not properly parse certain STUN messages.
A remote attacker could use this issue to cause PJSIP to crash, resulting
in a denial of service, or possibly execute arbitrary code.
(CVE-2021-37706)

Uriya Yavnieli discovered that PJSIP did not properly manage memory under
certain conditions. A remote attacker could use this issue to cause PJSIP
to crash, resulting in a denial of service, or possibly execute arbitrary
code. (CVE-2021-43299, CVE-2021-43300, CVE-2021-43301, CVE-2021-43302,
CVE-2021-43303)

It was discovered that PJSIP did not properly manage memory when processing
ICE session credentials. A remote attacker could use this issue to cause
PJSIP to crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2026-25994)

Update instructions

In general, a standard system update will make all the necessary changes.

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
18.04 LTS bionic libpj2 –  2.7.2~dfsg-1ubuntu0.1~esm1  
libpjmedia2 –  2.7.2~dfsg-1ubuntu0.1~esm1  
libpjnath2 –  2.7.2~dfsg-1ubuntu0.1~esm1  
libpjsip2 –  2.7.2~dfsg-1ubuntu0.1~esm1  
libpjsua2 –  2.7.2~dfsg-1ubuntu0.1~esm1  
python-pjproject –  2.7.2~dfsg-1ubuntu0.1~esm1  
16.04 LTS xenial libpj2 –  2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1  
libpjmedia2 –  2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1  
libpjnath2 –  2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1  
libpjsip2 –  2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1  
libpjsua2 –  2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1  

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References

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