VulnerabilityModified

CVE-2021-26712

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.

HIGH 7.5EPSS 3.63%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (3.63%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

CVSS 3.1: 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 3.63% probability · 89th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Affected: digium/asterisk · digium/certified asterisk
Source: cve@mitre.org

EPSS trend

EPSS 3.6% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

References

http://packetstormsecurity.com/files/161473/Asterisk-Project-Security-Advisory-AST-2021-003.htmlThird Party Advisory
http://seclists.org/fulldisclosure/2021/Feb/59Mailing List, Third Party Advisory
https://downloads.asterisk.org/pub/security/Vendor Advisory
https://downloads.asterisk.org/pub/security/AST-2021-003.htmlVendor Advisory
https://issues.asterisk.org/jira/browse/ASTERISK-29260Issue Tracking, Patch, Vendor Advisory
http://packetstormsecurity.com/files/161473/Asterisk-Project-Security-Advisory-AST-2021-003.htmlThird Party Advisory
http://seclists.org/fulldisclosure/2021/Feb/59Mailing List, Third Party Advisory
https://downloads.asterisk.org/pub/security/Vendor Advisory
https://downloads.asterisk.org/pub/security/AST-2021-003.htmlVendor Advisory
https://issues.asterisk.org/jira/browse/ASTERISK-29260Issue Tracking, Patch, Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.