CVE-2021-26713

MEDIUM
Published Feb 19, 20215y ago · Modified Jun 17, 20262w ago
6.5 CVSS 3.1
Medium
Find Similar
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
6.5
Exploitability
2.8
Impact
3.6
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

VendorProductVersionRange
digiumasterisk*≥16.0.0  –  <16.16.1
digiumasterisk*≥17.0.0  –  <17.9.2
digiumasterisk*≥18.0.0  –  <18.2.1
digiumcertified_asterisk16.8any
digiumcertified_asterisk16.8any
digiumcertified_asterisk16.8any
digiumcertified_asterisk16.8any
digiumcertified_asterisk16.8any
digiumcertified_asterisk16.8any
digiumcertified_asterisk16.8any
digiumcertified_asterisk16.8any
digiumcertified_asterisk16.8any
digiumcertified_asterisk16.8any
digiumcertified_asterisk16.8any
digiumcertified_asterisk16.8any
digiumcertified_asterisk16.8any

References 3

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.