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Ubuntu 18.04 PJSIP Critical Denial Of Service Vuln USN-8122

Linuxsecurity •LinuxSecurity Advisories • March 24, 2026

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS Summary: Several security issues were fixed in PJSIP. Software Description: - 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

The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS libpj2 2.7.2~dfsg-1ubuntu0.1~esm1 Available with Ubuntu Pro libpjmedia2 2.7.2~dfsg-1ubuntu0.1~esm1 Available with Ubuntu Pro libpjnath2 2.7.2~dfsg-1ubuntu0.1~esm1 Available with Ubuntu Pro libpjsip2 2.7.2~dfsg-1ubuntu0.1~esm1 Available with Ubuntu Pro libpjsua2 2.7.2~dfsg-1ubuntu0.1~esm1 Available with Ubuntu Pro python-pjproject 2.7.2~dfsg-1ubuntu0.1~esm1 Available with Ubuntu Pro Ubuntu 16.04 LTS libpj2 2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1 Available with Ubuntu Pro libpjmedia2 2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1 Available with Ubuntu Pro libpjnath2 2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1 Available with Ubuntu Pro libpjsip2 2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1 Available with Ubuntu Pro libpjsua2 2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1 Available with Ubuntu Pro In general, a standard system update will make all the necessary changes.

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

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

The full story

This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Critical PJSIP Vulnerabilities Affecting Ubuntu 16.04 and 18.04 LTS Multiple vulnerabilities in the PJSIP library have been identified, affecting Ubuntu 16.04 and 18.04 LTS. Youngsung Kim discovered a flaw that allows remote attackers to crash PJSIP by improperly parsing numeric header fields in SIP messages (CVE-2017-16872). Peter Koletzki found another vulnerability that could lead to denial of service by mishandling connection requests (CVE-2017-16875). Additionally, other issues were reported that could also cause crashes or denial of service. These vulnerabilities primarily impact Ubuntu 16.04 LTS, with some implications for Ubuntu 18.04 LTS. Users are advised to update to the latest package versions to mitigate these risks. The vulnerabilities could allow attackers to execute arbitrary code or disrupt services, emphasizing the need for immediate action. 2 sources 72

Extracted Entities

Ubuntu 18.04 PJSIP Critical Denial Of Service Vuln USN-8122

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Extracted Entities

Attack Types (1)

Companies (1)

CVEs (14)