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CVE-2021-26717

Status Candidate

Overview

An issue was discovered in Sangoma Asterisk 16.x before 16.16.1, 17.x before 17.9.2, and 18.x before 18.2.1 and Certified Asterisk before 16.8-cert6. When re-negotiating for T.38, if the initial remote response was delayed just enough, Asterisk would send both audio and T.38 in the SDP. If this happened, and the remote responded with a declined T.38 stream, then Asterisk would crash.

Related Files

Asterisk Project Security Advisory - AST-2021-002
Posted Feb 19, 2021
Authored by Kevin Harwell, Gregory Massel | Site asterisk.org

When re-negotiating for T.38 if the initial remote response was delayed just enough Asterisk would send both audio and T.38 in the SDP. If this happened, and the remote responded with a declined T.38 stream then Asterisk would crash.

tags | advisory, remote
advisories | CVE-2021-26717
SHA-256 | 2a9795115e2a46d96ffa9cb29f66fab90c91d64bdafcfd927d79e02c48f5c8b5
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