CVE-2021-26906
5.9
MEDIUM
CVSS 3.1
EPSS 0.81%
Description
An issue was discovered in res_pjsip_session.c in Digium Asterisk through 13.38.1; 14.x, 15.x, and 16.x through 16.16.0; 17.x through 17.9.1; and 18.x through 18.2.0, and Certified Asterisk through 16.8-cert5. An SDP negotiation vulnerability in PJSIP allows a remote server to potentially crash Asterisk by sending specific SIP responses that cause an SDP negotiation failure.
How to fix CVE-2021-26906
To remediate CVE-2021-26906, 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-2021-26906 being exploited?
Low — EPSS is 0.8%, 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 | MEDIUM5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |