{"id":"UBUNTU-CVE-2021-43804","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 affected versions if the incoming RTCP BYE message contains a reason's length, this declared length is not checked against the actual received packet size, potentially resulting in an out-of-bound read access. This issue affects all users that use PJMEDIA and RTCP. A malicious actor can send a RTCP BYE message with an invalid reason length. Users are advised to upgrade as soon as possible. There are no known workarounds.","modified":"2026-04-22T14:59:44.180920Z","published":"2021-12-22T18:15:00Z","related":["USN-6422-1"],"upstream":["CVE-2021-43804"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-43804"},{"type":"REPORT","url":"https://github.com/pjsip/pjproject/security/advisories/GHSA-3qx3-cg72-wrh9"},{"type":"REPORT","url":"https://github.com/pjsip/pjproject/commit/8b621f192cae14456ee0b0ade52ce6c6f258af1e"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6422-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-43804"}],"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"}]}],"versions":["2.1.0.0.ast20130823-1","2.1.0.0.ast20130823-1+deb8u1build0.16.04.1","2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1"],"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_version":"2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1","binary_name":"libpjmedia2"},{"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_version":"2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1","binary_name":"libpjsua2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-43804.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"}]}],"versions":["2.6~dfsg-2","2.7~dfsg-1","2.7.1~dfsg-1","2.7.1~dfsg-1build1","2.7.2~dfsg-1","2.7.2~dfsg-1ubuntu0.1~esm1"],"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_version":"2.7.2~dfsg-1ubuntu0.1~esm1","binary_name":"libpjsip-ua2"},{"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"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-43804.json"}},{"package":{"name":"ring","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/ring@20180228.1.503da2b~ds1-1ubuntu0.1~esm1?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"20180228.1.503da2b~ds1-1ubuntu0.1~esm1"}]}],"versions":["20170803.2.5fcfe3f~dfsg1-1","20171024.1.eadbdeb~ds1-1","20171129.2.cf5bbff~ds1-1","20171129.2.cf5bbff~ds1-2","20180119.1.9e06f94~ds1-1","20180119.1.9e06f94~ds1-3","20180222.1.7bffde2~ds2-2","20180228.1.503da2b~ds1-1","20180228.1.503da2b~ds1-1build1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"ring","binary_version":"20180228.1.503da2b~ds1-1ubuntu0.1~esm1"},{"binary_name":"ring-daemon","binary_version":"20180228.1.503da2b~ds1-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-43804.json"}},{"package":{"name":"ring","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/ring@20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1"}]}],"versions":["20190215.1.f152c98~ds1-1","20190215.1.f152c98~ds1-1build1","20190215.1.f152c98~ds1-1build2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"jami","binary_version":"20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1"},{"binary_name":"jami-daemon","binary_version":"20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1"},{"binary_version":"20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1","binary_name":"ring"},{"binary_name":"ring-daemon","binary_version":"20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-43804.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"},{"type":"Ubuntu","score":"medium"}]}