CVE-2021-26717
7.5
HIGH
CVSS 3.1
EPSS 0.42%
Description
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.
How to fix CVE-2021-26717
To remediate CVE-2021-26717, upgrade the affected package to a fixed version below.
- —upgrade to 16.16.1-r0 or later
- —upgrade to 1:16.16.1~dfsg-1 or later
Is CVE-2021-26717 being exploited?
Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 16.16.1-r0
- from 0, < 1:16.16.1~dfsg-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |