Detections
Analytics

Ubuntu 16.04 LTS / 18.04 LTS : PJSIP vulnerabilities (USN-8122-1)

critical Nessus Plugin ID 303754

Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8122-1 advisory.

 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 Vnsk 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)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

See Also

https://ubuntu.com/security/notices/USN-8122-1

Plugin Details

Severity: Critical

ID: 303754

File Name: ubuntu_USN-8122-1.nasl

Version: 1.1

Type: local

Agent: unix

Published: 3/25/2026

Updated: 3/25/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 9.3

Temporal Score: 7.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2021-37706

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

CVSS Score Source: CVE-2026-25994

CVSS v4

Risk Factor: Critical

Base Score: 9.3

Threat Score: 8.9

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS Score Source: CVE-2026-25994

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:16.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libpj2, p-cpe:/a:canonical:ubuntu_linux:libpjlib-util2, p-cpe:/a:canonical:ubuntu_linux:libpjmedia-audiodev2, p-cpe:/a:canonical:ubuntu_linux:libpjmedia-videodev2, p-cpe:/a:canonical:ubuntu_linux:libpjnath2, p-cpe:/a:canonical:ubuntu_linux:libpjsip-simple2, p-cpe:/a:canonical:ubuntu_linux:libpjsua2, p-cpe:/a:canonical:ubuntu_linux:libpjsua2-2v5, p-cpe:/a:canonical:ubuntu_linux:python-pjproject, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libpjmedia-codec2, p-cpe:/a:canonical:ubuntu_linux:libpjmedia2, p-cpe:/a:canonical:ubuntu_linux:libpjproject-dev, p-cpe:/a:canonical:ubuntu_linux:libpjsip-ua2, p-cpe:/a:canonical:ubuntu_linux:libpjsip2

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 3/24/2026

Vulnerability Publication Date: 11/17/2017

Reference Information

CVE: CVE-2017-16872, CVE-2017-16875, CVE-2018-1000098, CVE-2018-1000099, CVE-2020-15260, CVE-2021-21375, CVE-2021-32686, CVE-2021-37706, CVE-2021-43299, CVE-2021-43300, CVE-2021-43301, CVE-2021-43302, CVE-2021-43303, CVE-2026-25994

USN: 8122-1