CVE-2021-26713
MEDIUMAsterisk 16.0.0-16.16.0 and Certified Asterisk - Stack-based Buffer Overflow via WebRTC Hold/Unhold Requests
Title source: llmDescription
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/
Vendor Advisory x_refsource_misc
https://downloads.asterisk.org/pub/security/AST-2021-004.html
Vendor Advisory x_refsource_misc
https://issues.asterisk.org/jira/browse/ASTERISK-29205
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