{"id":"UBUNTU-CVE-2021-37706","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 STUN message contains an ERROR-CODE attribute, the header length is not checked before performing a subtraction operation, potentially resulting in an integer underflow scenario. This issue affects all users that use STUN. A malicious actor located within the victim’s network may forge and send a specially crafted UDP (STUN) message that could remotely execute arbitrary code on the victim’s machine. Users are advised to upgrade as soon as possible. There are no known workarounds.","modified":"2026-04-22T12:58:56.071434Z","published":"2021-12-22T18:15:00Z","related":["USN-6422-1","USN-6422-2","USN-8122-1"],"upstream":["CVE-2021-37706"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-37706"},{"type":"REPORT","url":"https://github.com/pjsip/pjproject/security/advisories/GHSA-2qpg-f6wf-w984"},{"type":"REPORT","url":"https://github.com/pjsip/pjproject/commit/15663e3f37091069b8c98a7fce680dc04bc8e865"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6422-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6422-2"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-37706"},{"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":{"availability":"Available 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with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-37706.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-2021-37706.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_version":"20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1","binary_name":"jami-daemon"},{"binary_name":"ring","binary_version":"20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1"},{"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-2021-37706.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:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}