CVE-2023-40019

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 version 1.10.10, FreeSWITCH allows authorized users to cause a denial of service attack by sending re-INVITE with SDP containing duplicate codec names. When a call in FreeSWITCH completes codec negotiation, the `codec_string` channel variable is set with the result of the negotiation. On a subsequent re-negotiation, if an SDP is offered that contains codecs with the same names but with different formats, there may be too many codec matches detected by FreeSWITCH leading to overflows of its internal arrays. By abusing this vulnerability, an attacker is able to corrupt stack of FreeSWITCH leading to an undefined behavior of the system or simply crash it. Version 1.10.10 contains a patch for this issue.

• CWE-770

• https://github.com/signalwire/freeswitch/releases/tag/v1.10.10Release Notes
• https://github.com/signalwire/freeswitch/security/advisories/GHSA-gjj5-79p2-9g3qExploit, Vendor Advisory
• https://github.com/signalwire/freeswitch/releases/tag/v1.10.10Release Notes
• https://github.com/signalwire/freeswitch/security/advisories/GHSA-gjj5-79p2-9g3qExploit, Vendor Advisory

Published

Sep 15, 2023

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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