{"id":"UBUNTU-CVE-2021-46837","details":"res_pjsip_t38 in Sangoma Asterisk 16.x before 16.16.2, 17.x before 17.9.3, and 18.x before 18.2.2, and Certified Asterisk before 16.8-cert7, allows an attacker to trigger a crash by sending an m=image line and zero port in a response to a T.38 re-invite initiated by Asterisk. This is a re-occurrence of the CVE-2019-15297 symptoms but not for exactly the same reason. The crash occurs because there is an append operation relative to the active topology, but this should instead be a replace operation.","modified":"2026-04-22T15:03:20.743368Z","published":"2022-08-30T07:15:00Z","upstream":["CVE-2021-46837"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-46837"},{"type":"REPORT","url":"https://downloads.asterisk.org/pub/security/AST-2021-006.html"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-46837"}],"affected":[{"package":{"name":"asterisk","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/asterisk@1:13.1.0~dfsg-1.1ubuntu4.1+esm1?arch=source&distro=esm-apps/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:13.1.0~dfsg-1.1ubuntu3","1:13.1.0~dfsg-1.1ubuntu4","1:13.1.0~dfsg-1.1ubuntu4.1","1:13.1.0~dfsg-1.1ubuntu4.1+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1:13.1.0~dfsg-1.1ubuntu4.1+esm1","binary_name":"asterisk"},{"binary_name":"asterisk-config","binary_version":"1:13.1.0~dfsg-1.1ubuntu4.1+esm1"},{"binary_name":"asterisk-dahdi","binary_version":"1:13.1.0~dfsg-1.1ubuntu4.1+esm1"},{"binary_name":"asterisk-mobile","binary_version":"1:13.1.0~dfsg-1.1ubuntu4.1+esm1"},{"binary_name":"asterisk-modules","binary_version":"1:13.1.0~dfsg-1.1ubuntu4.1+esm1"},{"binary_name":"asterisk-mp3","binary_version":"1:13.1.0~dfsg-1.1ubuntu4.1+esm1"},{"binary_name":"asterisk-mysql","binary_version":"1:13.1.0~dfsg-1.1ubuntu4.1+esm1"},{"binary_name":"asterisk-ooh323","binary_version":"1:13.1.0~dfsg-1.1ubuntu4.1+esm1"},{"binary_name":"asterisk-voicemail","binary_version":"1:13.1.0~dfsg-1.1ubuntu4.1+esm1"},{"binary_name":"asterisk-voicemail-imapstorage","binary_version":"1:13.1.0~dfsg-1.1ubuntu4.1+esm1"},{"binary_name":"asterisk-voicemail-odbcstorage","binary_version":"1:13.1.0~dfsg-1.1ubuntu4.1+esm1"},{"binary_name":"asterisk-vpb","binary_version":"1:13.1.0~dfsg-1.1ubuntu4.1+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-46837.json"}},{"package":{"name":"asterisk","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/asterisk@1:13.18.3~dfsg-1ubuntu4?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:13.17.2~dfsg-1ubuntu1","1:13.17.2~dfsg-2ubuntu1","1:13.18.1~dfsg-1ubuntu1","1:13.18.3~dfsg-1ubuntu1","1:13.18.3~dfsg-1ubuntu2","1:13.18.3~dfsg-1ubuntu3","1:13.18.3~dfsg-1ubuntu4"],"ecosystem_specific":{"binaries":[{"binary_name":"asterisk","binary_version":"1:13.18.3~dfsg-1ubuntu4"},{"binary_name":"asterisk-config","binary_version":"1:13.18.3~dfsg-1ubuntu4"},{"binary_name":"asterisk-dahdi","binary_version":"1:13.18.3~dfsg-1ubuntu4"},{"binary_name":"asterisk-mobile","binary_version":"1:13.18.3~dfsg-1ubuntu4"},{"binary_name":"asterisk-modules","binary_version":"1:13.18.3~dfsg-1ubuntu4"},{"binary_name":"asterisk-mp3","binary_version":"1:13.18.3~dfsg-1ubuntu4"},{"binary_name":"asterisk-mysql","binary_version":"1:13.18.3~dfsg-1ubuntu4"},{"binary_name":"asterisk-ooh323","binary_version":"1:13.18.3~dfsg-1ubuntu4"},{"binary_name":"asterisk-tests","binary_version":"1:13.18.3~dfsg-1ubuntu4"},{"binary_name":"asterisk-voicemail","binary_version":"1:13.18.3~dfsg-1ubuntu4"},{"binary_name":"asterisk-voicemail-imapstorage","binary_version":"1:13.18.3~dfsg-1ubuntu4"},{"binary_name":"asterisk-voicemail-odbcstorage","binary_version":"1:13.18.3~dfsg-1ubuntu4"},{"binary_name":"asterisk-vpb","binary_version":"1:13.18.3~dfsg-1ubuntu4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-46837.json"}},{"package":{"name":"asterisk","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/asterisk@1:16.2.1~dfsg-2ubuntu1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:16.2.1~dfsg-2build2","1:16.2.1~dfsg-2build3","1:16.2.1~dfsg-2ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"asterisk","binary_version":"1:16.2.1~dfsg-2ubuntu1"},{"binary_version":"1:16.2.1~dfsg-2ubuntu1","binary_name":"asterisk-config"},{"binary_name":"asterisk-dahdi","binary_version":"1:16.2.1~dfsg-2ubuntu1"},{"binary_name":"asterisk-mobile","binary_version":"1:16.2.1~dfsg-2ubuntu1"},{"binary_name":"asterisk-modules","binary_version":"1:16.2.1~dfsg-2ubuntu1"},{"binary_name":"asterisk-mp3","binary_version":"1:16.2.1~dfsg-2ubuntu1"},{"binary_version":"1:16.2.1~dfsg-2ubuntu1","binary_name":"asterisk-mysql"},{"binary_name":"asterisk-ooh323","binary_version":"1:16.2.1~dfsg-2ubuntu1"},{"binary_name":"asterisk-tests","binary_version":"1:16.2.1~dfsg-2ubuntu1"},{"binary_name":"asterisk-voicemail","binary_version":"1:16.2.1~dfsg-2ubuntu1"},{"binary_name":"asterisk-voicemail-imapstorage","binary_version":"1:16.2.1~dfsg-2ubuntu1"},{"binary_name":"asterisk-voicemail-odbcstorage","binary_version":"1:16.2.1~dfsg-2ubuntu1"},{"binary_version":"1:16.2.1~dfsg-2ubuntu1","binary_name":"asterisk-vpb"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-4683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