CVE-2021-26713
MEDIUM
Published Feb 19, 20215y ago · Modified Jun 17, 20262w ago
6.5 CVSS 3.1
Published Feb 19, 2021 5y ago
Last Modified Jun 17, 2026 2w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High
Threat Intelligence
No active exploitation signals — not in CISA KEV and no EPSS score yet.
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-787 Out-of-bounds Write Memory Safety
Affected Products 16
| Vendor | Product | Version | Range |
|---|---|---|---|
| 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 | any |
| digium | certified_asterisk | 16.8 | any |
| digium | certified_asterisk | 16.8 | any |
| digium | certified_asterisk | 16.8 | any |
| digium | certified_asterisk | 16.8 | any |
| digium | certified_asterisk | 16.8 | any |
| digium | certified_asterisk | 16.8 | any |
| digium | certified_asterisk | 16.8 | any |
| digium | certified_asterisk | 16.8 | any |
| digium | certified_asterisk | 16.8 | any |
| digium | certified_asterisk | 16.8 | any |
| digium | certified_asterisk | 16.8 | any |
| digium | certified_asterisk | 16.8 | any |
References 3
- downloads.asterisk.org https://downloads.asterisk.org/pub/security/
- downloads.asterisk.org https://downloads.asterisk.org/pub/security/AST-2021-004.html
- issues.asterisk.org https://issues.asterisk.org/jira/browse/ASTERISK-29205
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.