res_pjsip_t38 in Sangoma Asterisk 16.x before 16.16.2, 17.x before 17.9.3, and 18.x…
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-476.
Summary
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 11
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:asterisk:certified_asterisk:16.8.0:-:*:*:*:*:*:* | 16.8.0 | Vulnerable | asterisk |
| cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert1:*:*:*:*:*:* | 16.8.0 cert1 | Vulnerable | asterisk |
| cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert2:*:*:*:*:*:* | 16.8.0 cert2 | Vulnerable | asterisk |
| cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert3:*:*:*:*:*:* | 16.8.0 cert3 | Vulnerable | asterisk |
| cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert4:*:*:*:*:*:* | 16.8.0 cert4 | Vulnerable | asterisk |
| cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert5:*:*:*:*:*:* | 16.8.0 cert5 | Vulnerable | asterisk |
| cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert6:*:*:*:*:*:* | 16.8.0 cert6 | Vulnerable | asterisk |
| cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:* | 16.0.0 to before 16.16.2; 17.0.0 to before 17.9.3; 18.0.0 to before 18.2.2 | Vulnerable | Digium |
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Debian |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Debian |
- cpe:2.3:a:asterisk:certified_asterisk:16.8.0:-:*:*:*:*:*:* Versions 16.8.0 Vulnerable ·asterisk
- cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert1:*:*:*:*:*:* Versions 16.8.0 cert1 Vulnerable ·asterisk
- cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert2:*:*:*:*:*:* Versions 16.8.0 cert2 Vulnerable ·asterisk
- cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert3:*:*:*:*:*:* Versions 16.8.0 cert3 Vulnerable ·asterisk
- cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert4:*:*:*:*:*:* Versions 16.8.0 cert4 Vulnerable ·asterisk
- cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert5:*:*:*:*:*:* Versions 16.8.0 cert5 Vulnerable ·asterisk
- cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert6:*:*:*:*:*:* Versions 16.8.0 cert6 Vulnerable ·asterisk
- cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:* Versions 16.0.0 to before 16.16.2; 17.0.0 to before 17.9.3; 18.0.0 to before 18.2.2 Vulnerable ·Digium
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-46837
- 2026-10-03 Alias added: GHSA-544v-7w28-m77x
References
Sources
- CVE-2021-46837 · CVE Program
- CVE-2021-46837 · NVD
- FIRST EPSS
- GHSA-544v-7w28-m77x · GitHub Advisory Database · CC BY 4.0
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