{"id":"CVE-2026-116789","title":"FreeSWITCH: DTLS-SRTP peer certificate is not bound to the SDP fingerprint when FreeSWITCH is the DTLS server","summary":"FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to 1.11.2, dtls_state_setup() compared a peer ce…","severity":"high","cvss":7.4,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","cvssSource":"cna","cwe":["CWE-295","CWE-300"],"vendor":"signalwire","product":"freeswitch","affected":["freeswitch < 1.11.2"],"published":"2026-11-05","updated":"2026-11-05","sourceUpdated":"2026-11-05T19:29:17.061Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-116789","references":[{"url":"https://github.com/signalwire/freeswitch/security/advisories/GHSA-8ghv-ccjr-4cx9","label":"https://github.com/signalwire/freeswitch/security/advisories/GHSA-8ghv-ccjr-4cx9"},{"url":"https://github.com/signalwire/freeswitch/commit/ea74c0acb8b85c5fc50158cd592a1b80c4edf6a6","label":"https://github.com/signalwire/freeswitch/commit/ea74c0acb8b85c5fc50158cd592a1b80c4edf6a6"},{"url":"https://github.com/signalwire/freeswitch/releases/tag/v1.11.2","label":"https://github.com/signalwire/freeswitch/releases/tag/v1.11.2"}],"tags":["cve.org"],"ingestedAt":"2026-11-05T22:38:31.548Z","slug":"CVE-2026-116789","body":"## Overview\n\nFreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to 1.11.2, dtls_state_setup() compared a peer certificate with the SDP a=fingerprint only when FreeSWITCH was the DTLS client, not when it held the DTLS server role. An unauthenticated peer able to reach the negotiated media port could complete the DTLS-SRTP handshake with an unrelated certificate, obtain the leg's SRTP keys, decrypt and inject media, and displace the legitimate endpoint; on ICE-enabled legs the peer also needs the connectivity-check credentials from SDP, which generally requires signaling visibility or a position on its path. WebRTC and SIP DTLS-SRTP legs are affected whenever the peer selects the active role, while FreeSWITCH client-role handshakes already perform fingerprint validation. Version 1.11.2 introduces the remediation, which requires rtp_dtls_client_cert_verify_mode=fingerprint.\n\n## Affected\n\n- `freeswitch < 1.11.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":40.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}