CVE-2021-26713 - CVE House
Back to Database
Status published Medium CVE-2021-26713

A stack-based buffer overflow in res_rtp_asterisk.c in Sangoma Asterisk before...

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2021-26713

Credits & Attribution

No credits recorded in the NVD database.

References

More from digium

View All →
CVE-2022-26651
An issue was discovered in Asterisk through 19.x and Certified...
Critical 9.8
CVE-2022-26499
An SSRF issue was discovered in Asterisk through 19.x. When...
Critical 9.1
CVE-2022-26498
An issue was discovered in Asterisk through 19.x. When using...
High 7.5
CVE-2021-32558
An issue was discovered in Sangoma Asterisk 13.x before 13.38.3,...
High 7.5
CVE-2021-31878
An issue was discovered in PJSIP in Asterisk before 16.19.1...
Medium 6.5

Affected Vendor

Affected Software

asterisk, certified asterisk
Vulnerable Versions:
16.0.0, 17.0.0, 18.0.0, 16.8

Timeline

Official Publish: February 19th, 2021
Last Modified: August 3rd, 2024
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.