PT-2021-17106 · Sangoma+1 · Asterisk+1

Alexander Traud + 1 · CVE-2021-26712 · Published 2021-02-18 · Updated 2025-02-13

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Sangoma Asterisk versions 13.38.1 through 18.2.0 Certified Asterisk version 16.8-cert5

Description The issue is related to incorrect access controls in the res srtp.c module, allowing a remote unauthenticated attacker to prematurely terminate secure calls by replaying SRTP packets.

Recommendations For Sangoma Asterisk versions 13.38.1 through 18.2.0, update to a version that includes the fix for the incorrect access controls in the res srtp.c module. For Certified Asterisk version 16.8-cert5, update to a version that includes the fix for the incorrect access controls in the res srtp.c module. As a temporary workaround, consider restricting access to the res srtp.c module to minimize the risk of exploitation.

Fix

Related Identifiers

ALT-PU-2023-6874

ALT-PU-2025-2613

CVE-2021-26712

Affected Products

Alt Linux

Asterisk

References · 13

• https://osv.dev/vulnerability/CVE-2021-26712 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-26712 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-26712 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-26712 · Vendor Advisory
• https://downloads.asterisk.org/pub/security · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-26712 · Security Note
• https://downloads.asterisk.org/pub/security/AST-2021-003.html · Vendor Advisory
• https://osv.dev/vulnerability/ALPINE-CVE-2021-26712 · Vendor Advisory
• https://issues.asterisk.org/jira/browse/ASTERISK-29260 · Vendor Advisory
• http://packetstormsecurity.com/files/161473/Asterisk-Project-Security-Advisory-AST-2021-003.html · Note
• http://seclists.org/fulldisclosure/2021/Feb/59 · Note
• https://security.alpinelinux.org/vuln/CVE-2021-26712 · Note
• https://t.me/cibsecurity/23840 · Telegram Post