{"id":"ALPINE-CVE-2021-26906","details":"An issue was discovered in res_pjsip_session.c in Digium Asterisk through 13.38.1; 14.x, 15.x, and 16.x through 16.16.0; 17.x through 17.9.1; and 18.x through 18.2.0, and Certified Asterisk through 16.8-cert5. An SDP negotiation vulnerability in PJSIP allows a remote server to potentially crash Asterisk by sending specific SIP responses that cause an SDP negotiation failure.","modified":"2026-09-15T08:17:46.631692783Z","published":"2021-02-18T20:15:12.743Z","upstream":["CVE-2021-26906"],"references":[{"type":"ADVISORY","url":"https://security.alpinelinux.org/vuln/CVE-2021-26906"}],"affected":[{"package":{"name":"asterisk","ecosystem":"Alpine:v3.12","purl":"pkg:apk/alpine/asterisk?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"13.0.0"},{"fixed":"16.16.1-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-26906.json"}},{"package":{"name":"asterisk","ecosystem":"Alpine:v3.13","purl":"pkg:apk/alpine/asterisk?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"13.0.0"},{"fixed":"18.2.1-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-26906.json"}},{"package":{"name":"asterisk","ecosystem":"Alpine:v3.14","purl":"pkg:apk/alpine/asterisk?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"13.0.0"},{"fixed":"18.2.1-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-26906.json"}},{"package":{"name":"asterisk","ecosystem":"Alpine:v3.15","purl":"pkg:apk/alpine/asterisk?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"13.0.0"},{"fixed":"18.2.1-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-26906.json"}},{"package":{"name":"asterisk","ecosystem":"Alpine:v3.16","purl":"pkg:apk/alpine/asterisk?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"13.0.0"},{"fixed":"18.2.1-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-26906.json"}},{"package":{"name":"asterisk","ecosystem":"Alpine:v3.17","purl":"pkg:apk/alpine/asterisk?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"13.0.0"},{"fixed":"18.2.1-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-26906.json"}},{"package":{"name":"asterisk","ecosystem":"Alpine:v3.18","purl":"pkg:apk/alpine/asterisk?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"13.0.0"},{"fixed":"18.2.1-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-26906.json"}},{"package":{"name":"asterisk","ecosystem":"Alpine:v3.19","purl":"pkg:apk/alpine/asterisk?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"13.0.0"},{"fixed":"18.2.1-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-26906.json"}},{"package":{"name":"asterisk","ecosystem":"Alpine:v3.20","purl":"pkg:apk/alpine/asterisk?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"13.0.0"},{"fixed":"18.2.1-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-26906.json"}},{"package":{"name":"asterisk","ecosystem":"Alpine:v3.21","purl":"pkg:apk/alpine/asterisk?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"13.0.0"},{"fixed":"18.2.1-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-26906.json"}},{"package":{"name":"asterisk","ecosystem":"Alpine:v3.22","purl":"pkg:apk/alpine/asterisk?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"13.0.0"},{"fixed":"18.2.1-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-26906.json"}},{"package":{"name":"asterisk","ecosystem":"Alpine:v3.23","purl":"pkg:apk/alpine/asterisk?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"13.0.0"},{"fixed":"18.2.1-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-26906.json"}},{"package":{"name":"asterisk","ecosystem":"Alpine:v3.24","purl":"pkg:apk/alpine/asterisk?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"13.0.0"},{"fixed":"18.2.1-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-26906.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}