An issue was discovered in res_pjsip_t38.c in Sangoma Asterisk through 13.x and Certified…
Priority MEDIUM 47CWE-476Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- 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
An issue was discovered in res_pjsip_t38.c in Sangoma Asterisk through 13.x and Certified Asterisk through 13.21-x. If it receives a re-invite initiating T.38 faxing and has a port of 0 and no c line in the SDP, a NULL pointer dereference and crash will occur. This is different from CVE-2019-18940.
Why it matters now
EPSS 0.12789 96th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
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 · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:* | 13.0.0 – 13.29.1 | Vulnerable | Digium |
| cpe:2.3:a:digium:certified_asterisk:13.21:*:*:*:*:*:*:* | 13.21 | Vulnerable | Digium |
| cpe:2.3:a:digium:certified_asterisk:13.21:cert1:*:*:*:*:*:* | 13.21 cert1 | Vulnerable | Digium |
| cpe:2.3:a:digium:certified_asterisk:13.21:cert2:*:*:*:*:*:* | 13.21 cert2 | Vulnerable | Digium |
| cpe:2.3:a:digium:certified_asterisk:13.21:cert3:*:*:*:*:*:* | 13.21 cert3 | Vulnerable | Digium |
| cpe:2.3:a:digium:certified_asterisk:13.21:cert4:*:*:*:*:*:* | 13.21 cert4 | Vulnerable | Digium |
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Debian |
- cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:* Versions 13.0.0 – 13.29.1 Vulnerable ·Digium
- cpe:2.3:a:digium:certified_asterisk:13.21:*:*:*:*:*:*:* Versions 13.21 Vulnerable ·Digium
- cpe:2.3:a:digium:certified_asterisk:13.21:cert1:*:*:*:*:*:* Versions 13.21 cert1 Vulnerable ·Digium
- cpe:2.3:a:digium:certified_asterisk:13.21:cert2:*:*:*:*:*:* Versions 13.21 cert2 Vulnerable ·Digium
- cpe:2.3:a:digium:certified_asterisk:13.21:cert3:*:*:*:*:*:* Versions 13.21 cert3 Vulnerable ·Digium
- cpe:2.3:a:digium:certified_asterisk:13.21:cert4:*:*:*:*:*:* Versions 13.21 cert4 Vulnerable ·Digium
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2019-18976
- 2026-10-03 Alias added: GHSA-6fr3-g4mr-859f
References
Advisory 6
- https://www.asterisk.org/downloads/security-advisories
- https://www.cybersecurity-help.cz/vdb/SB2019112218?affChecked=1
- https://packetstormsecurity.com/files/155436/Asterisk-Project-Security-Advisory-AST-2019-008.html
- https://seclists.org/fulldisclosure/2019/Nov/20
- http://downloads.asterisk.org/pub/security/AST-2019-008.html
- [debian-lts-announce] 20220403 [SECURITY] [DLA 2969-1] asterisk security update
Sources
- CVE-2019-18976 · CVE Program
- CVE-2019-18976 · NVD
- FIRST EPSS
- GHSA-6fr3-g4mr-859f · GitHub Advisory Database · CC BY 4.0
- CVE-2019-18976 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences