A use-after-free in res_pjsip_pubsub.c in Sangoma Asterisk 16.28, 18.14, 19.6, and…
Priority LOW 32CWE-416Published · Updated
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 · CISA ADP. Fix status from CNA. Impact type from CWE-416 and the CVSS impact.
Summary
A use-after-free in res_pjsip_pubsub.c in Sangoma Asterisk 16.28, 18.14, 19.6, and certified/18.9-cert2 may allow a remote authenticated attacker to crash Asterisk (denial of service) by performing activity on a subscription via a reliable transport at the same time that Asterisk is also performing activity on that subscription.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01318 70th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
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 · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:* | 16.0.0 to before 16.29.1; 18.14.0 to before 18.15.1; 19.6.0 to before 19.7.1 | Vulnerable | Sangoma |
| cpe:2.3:a:sangoma:asterisk:20.0.0:*:*:*:*:*:*:* | 20.0.0 | Vulnerable | Sangoma |
| cpe:2.3:a:sangoma:certified_asterisk:18.9:cert2:*:*:*:*:*:* | 18.9 cert2 | Vulnerable | Sangoma |
- cpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:* Versions 16.0.0 to before 16.29.1; 18.14.0 to before 18.15.1; 19.6.0 to before 19.7.1 Vulnerable ·Sangoma
- cpe:2.3:a:sangoma:asterisk:20.0.0:*:*:*:*:*:*:* Versions 20.0.0 Vulnerable ·Sangoma
- cpe:2.3:a:sangoma:certified_asterisk:18.9:cert2:*:*:*:*:*:* Versions 18.9 cert2 Vulnerable ·Sangoma
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2022-42705
- 2026-10-03 Alias added: GHSA-89gw-96wv-f4r4
References
More Sangoma Asterisk vulnerabilities
- TI-2025-30244 Using malformed From header can forge identity with ";" or NULL in name portion CVSS 3.1HIGH 7.7
- TI-2025-00959 Asterisk Unsafe Shell Sourcing in safe_asterisk Leads to Local Privilege Escalation CVSS 4.0HIGH 7.0
- TI-2025-34699 Asterisk remotely exploitable leak of RTP UDP ports and internal resources CVSS 3.1MEDIUM 6.5
- TI-2025-31747 Asterisk is Vulnerable to Remote DoS and possible RCE Attacks During Memory Allocation CVSS 3.1MEDIUM 6.5
- TI-2024-35843 An issue in the action_listcategories() function of Sangoma Asterisk… CVSS 3.1MEDIUM 5.5
- TI-2025-30245 cli_permissions.conf: deny option does not work for disallowing shell commands CVSS 4.0MEDIUM 4.8
Sources
- CVE-2022-42705 · CVE Program
- CVE-2022-42705 · NVD
- FIRST EPSS
- GHSA-89gw-96wv-f4r4 · GitHub Advisory Database · CC BY 4.0
- CVE-2022-42705 · 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