CVE-2026-116789 (GCVE-0-2026-116789)

Vulnerability from cvelistv5 – Published: 2026-11-05 19:29 – Updated: 2026-11-09 22:43
VLAI
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 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.
Severity
7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-09 22:43 UTC
CWE
  • CWE-295 - Improper Certificate Validation
  • CWE-300 - Channel Accessible by Non-Endpoint
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7802 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
signalwire freeswitch Affected: < 1.11.2
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

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