CVE-2021-26713
Last modified
CVE-2021-26713 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 1.85% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Digium | Asterisk | >= 16.0.0, < 16.16.1 |
| Digium | Asterisk | >= 17.0.0, < 17.9.2 |
| Digium | Asterisk | >= 18.0.0, < 18.2.1 |
| Digium | Certified Asterisk | 16.8 |
References
- https://downloads.asterisk.org/pub/security/Vendor Advisory
- https://issues.asterisk.org/jira/browse/ASTERISK-29205Vendor Advisory
- https://downloads.asterisk.org/pub/security/Vendor Advisory
- https://issues.asterisk.org/jira/browse/ASTERISK-29205Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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