CVE-2021-46837
MEDIUM
Published Aug 30, 20223y ago · Modified Jun 17, 20262w ago
6.5 CVSS 3.1
Published Aug 30, 2022 3y ago
Last Modified Jun 17, 2026 2w ago
Description
res_pjsip_t38 in Sangoma Asterisk 16.x before 16.16.2, 17.x before 17.9.3, and 18.x before 18.2.2, and Certified Asterisk before 16.8-cert7, allows an attacker to trigger a crash by sending an m=image line and zero port in a response to a T.38 re-invite initiated by Asterisk. This is a re-occurrence of the CVE-2019-15297 symptoms but not for exactly the same reason. The crash occurs because there is an append operation relative to the active topology, but this should instead be a replace operation.
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-476 NULL Pointer Dereference Memory Safety
Affected Products 13
| Vendor | Product | Version | Range |
|---|---|---|---|
| asterisk | certified_asterisk | 16.8.0 | any |
| asterisk | certified_asterisk | 16.8.0 | any |
| asterisk | certified_asterisk | 16.8.0 | any |
| asterisk | certified_asterisk | 16.8.0 | any |
| asterisk | certified_asterisk | 16.8.0 | any |
| asterisk | certified_asterisk | 16.8.0 | any |
| asterisk | certified_asterisk | 16.8.0 | any |
| digium | asterisk | * | ≥16.0.0 – <16.16.2 |
| digium | asterisk | * | ≥17.0.0 – <17.9.3 |
| digium | asterisk | * | ≥18.0.0 – <18.2.2 |
| debian | debian_linux | 9.0 | any |
| debian | debian_linux | 10.0 | any |
| debian | debian_linux | 11.0 | any |
References 3
- downloads.asterisk.org https://downloads.asterisk.org/pub/security/AST-2021-006.html
- lists.debian.org https://lists.debian.org/debian-lts-announce/2022/11/msg00021.html
- debian.org https://www.debian.org/security/2022/dsa-5285
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.