{"id":"UBUNTU-CVE-2021-21375","details":"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 PJSIP version 2.10 and earlier, after an initial INVITE has been sent, when two 183 responses are received, with the first one causing negotiation failure, a crash will occur. This results in a denial of service.","modified":"2026-04-22T14:33:23.018885Z","published":"2021-03-10T23:15:00Z","related":["USN-8122-1"],"upstream":["CVE-2021-21375"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-21375"},{"type":"REPORT","url":"https://github.com/pjsip/pjproject/commit/97b3d7addbaa720b7ddb0af9bf6f3e443e664365"},{"type":"REPORT","url":"https://github.com/pjsip/pjproject/security/advisories/GHSA-hvq6-f89p-frvp"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-21375"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8122-1"}],"affected":[{"package":{"name":"pjproject","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/pjproject@2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1?arch=source&distro=esm-apps/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1"}]}],"versions":["2.1.0.0.ast20130823-1","2.1.0.0.ast20130823-1+deb8u1build0.16.04.1"],"ecosystem_specific":{"binaries":[{"binary_name":"libpj2","binary_version":"2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1"},{"binary_name":"libpjlib-util2","binary_version":"2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1"},{"binary_name":"libpjmedia-audiodev2","binary_version":"2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1"},{"binary_name":"libpjmedia-codec2","binary_version":"2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1"},{"binary_name":"libpjmedia-videodev2","binary_version":"2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1"},{"binary_name":"libpjmedia2","binary_version":"2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1"},{"binary_name":"libpjnath2","binary_version":"2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1"},{"binary_name":"libpjsip-simple2","binary_version":"2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1"},{"binary_name":"libpjsip-ua2","binary_version":"2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1"},{"binary_name":"libpjsip2","binary_version":"2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1"},{"binary_name":"libpjsua2","binary_version":"2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-21375.json"}},{"package":{"name":"pjproject","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/pjproject@2.7.2~dfsg-1ubuntu0.1~esm1?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.7.2~dfsg-1ubuntu0.1~esm1"}]}],"versions":["2.6~dfsg-2","2.7~dfsg-1","2.7.1~dfsg-1","2.7.1~dfsg-1build1","2.7.2~dfsg-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libpj2","binary_version":"2.7.2~dfsg-1ubuntu0.1~esm1"},{"binary_name":"libpjlib-util2","binary_version":"2.7.2~dfsg-1ubuntu0.1~esm1"},{"binary_name":"libpjmedia-audiodev2","binary_version":"2.7.2~dfsg-1ubuntu0.1~esm1"},{"binary_name":"libpjmedia-codec2","binary_version":"2.7.2~dfsg-1ubuntu0.1~esm1"},{"binary_name":"libpjmedia-videodev2","binary_version":"2.7.2~dfsg-1ubuntu0.1~esm1"},{"binary_name":"libpjmedia2","binary_version":"2.7.2~dfsg-1ubuntu0.1~esm1"},{"binary_name":"libpjnath2","binary_version":"2.7.2~dfsg-1ubuntu0.1~esm1"},{"binary_name":"libpjsip-simple2","binary_version":"2.7.2~dfsg-1ubuntu0.1~esm1"},{"binary_name":"libpjsip-ua2","binary_version":"2.7.2~dfsg-1ubuntu0.1~esm1"},{"binary_name":"libpjsip2","binary_version":"2.7.2~dfsg-1ubuntu0.1~esm1"},{"binary_name":"libpjsua2","binary_version":"2.7.2~dfsg-1ubuntu0.1~esm1"},{"binary_name":"libpjsua2-2v5","binary_version":"2.7.2~dfsg-1ubuntu0.1~esm1"},{"binary_name":"python-pjproject","binary_version":"2.7.2~dfsg-1ubuntu0.1~esm1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-21375.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}