CVE-2021-26712

7.5 HIGH 4% exploit odds Fix listed

What it is

Incorrect access controls in res_srtp.c in Sangoma Asterisk 13.38.1, 16.16.0, 17.9.1, and 18.2.0 and Certified Asterisk 16.8-cert5 allow a remote unauthenticated attacker to prematurely terminate secure calls by replaying SRTP packets.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of service disruption.
Exploit odds: 3.6% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2021-02-18 21:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 03:43 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 3.6% in the next 30 days (EPSS).
Severity: 7.5 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2021-02-18 21:15 UTC
Last modified: 2026-06-17 03:43 UTC
Exploit probability: 3.6% · EPSS, next 30 days
Record status: Modified

Affected

Digium Asterisk ≤ 13.38.2
Digium Asterisk < 16.16.1
Digium Asterisk < 17.9.2
Digium Asterisk < 18.2.1
Digium Certified Asterisk 16.8

Attack profile CVSS 3.1 · 7.5

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Is it in your code?

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Read https://cve-list.com/agent/cve/CVE-2021-26712.md and follow it. Check whether this project is affected by CVE-2021-26712. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record