CVE-2021-26713

MEDIUM

Asterisk 16.0.0-16.16.0 and Certified Asterisk - Stack-based Buffer Overflow via WebRTC Hold/Unhold Requests

Title source: llm
STIX 2.1

Description

A stack-based buffer overflow in res_rtp_asterisk.c in Sangoma Asterisk before 16.16.1, 17.x before 17.9.2, and 18.x before 18.2.1 and Certified Asterisk before 16.8-cert6 allows an authenticated WebRTC client to cause an Asterisk crash by sending multiple hold/unhold requests in quick succession. This is caused by a signedness comparison mismatch.

References (3)

Core 3
Core References
Vendor Advisory x_refsource_misc
https://downloads.asterisk.org/pub/security/

Scores

CVSS v3 6.5
EPSS 0.0185
EPSS Percentile 76.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Details

CWE
CWE-787
Status published
Products (2)
digium/asterisk 16.0.0 - 16.16.1
digium/certified_asterisk 16.8 (13 CPE variants)
Published Feb 19, 2021
Tracked Since Feb 18, 2026