An issue was discovered in Asterisk Open Source 13.12.x and 13.13.x before 13.13.1 and…
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 3.0 · NVD. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.
Summary
An issue was discovered in Asterisk Open Source 13.12.x and 13.13.x before 13.13.1 and 14.x before 14.2.1. If an SDP offer or answer is received with the Opus codec and with the format parameters separated using a space the code responsible for parsing will recursively call itself until it crashes. This occurs as the code does not properly handle spaces separating the parameters. This does NOT require the endpoint to have Opus configured in Asterisk. This also does not require the endpoint to be authenticated. If guest is enabled for chan_sip or anonymous in chan_pjsip an SDP offer or answer is still processed and the crash occurs.
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 · 9
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:digium:asterisk:13.12:*:*:*:*:*:*:* | 13.12 | Vulnerable | Digium |
| cpe:2.3:a:digium:asterisk:13.13:*:*:*:*:*:*:* | 13.13 | Vulnerable | Digium |
| cpe:2.3:a:digium:asterisk:14.0:*:*:*:*:*:*:* | 14.0 | Vulnerable | Digium |
| cpe:2.3:a:digium:asterisk:14.1:*:*:*:*:*:*:* | 14.1 | Vulnerable | Digium |
| cpe:2.3:a:digium:asterisk:14.01:*:*:*:*:*:*:* | 14.01 | Vulnerable | Digium |
| cpe:2.3:a:digium:asterisk:14.1.1:*:*:*:*:*:*:* | 14.1.1 | Vulnerable | Digium |
| cpe:2.3:a:digium:asterisk:14.1.2:*:*:*:*:*:*:* | 14.1.2 | Vulnerable | Digium |
| cpe:2.3:a:digium:asterisk:14.02:*:*:*:*:*:*:* | 14.02 | Vulnerable | Digium |
| cpe:2.3:a:digium:asterisk:14.2:*:*:*:*:*:*:* | 14.2 | Vulnerable | Digium |
- cpe:2.3:a:digium:asterisk:13.12:*:*:*:*:*:*:* Versions 13.12 Vulnerable ·Digium
- cpe:2.3:a:digium:asterisk:13.13:*:*:*:*:*:*:* Versions 13.13 Vulnerable ·Digium
- cpe:2.3:a:digium:asterisk:14.0:*:*:*:*:*:*:* Versions 14.0 Vulnerable ·Digium
- cpe:2.3:a:digium:asterisk:14.1:*:*:*:*:*:*:* Versions 14.1 Vulnerable ·Digium
- cpe:2.3:a:digium:asterisk:14.01:*:*:*:*:*:*:* Versions 14.01 Vulnerable ·Digium
- cpe:2.3:a:digium:asterisk:14.1.1:*:*:*:*:*:*:* Versions 14.1.1 Vulnerable ·Digium
- cpe:2.3:a:digium:asterisk:14.1.2:*:*:*:*:*:*:* Versions 14.1.2 Vulnerable ·Digium
- cpe:2.3:a:digium:asterisk:14.02:*:*:*:*:*:*:* Versions 14.02 Vulnerable ·Digium
- cpe:2.3:a:digium:asterisk:14.2:*:*:*:*:*:*:* Versions 14.2 Vulnerable ·Digium
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2016-9937
- 2026-10-03 Alias added: GHSA-6qm8-8j44-j9h2
References
More Digium Asterisk vulnerabilities
- TI-2006-05256 Integer overflow in the get_input function in the Skinny channel driver (chan_skinny.c)… CVSS 2.0HIGH 7.5
- TI-2017-12542 An issue was discovered in chan_skinny.c in Asterisk Open Source 13.18.2 and older… CVSS 3.0HIGH 7.5
- TI-2023-27195 Asterisk susceptible to Denial of Service via DTLS Hello packets during call initiation CVSS 3.1HIGH 7.5
- TI-2017-13083 An issue was discovered in Asterisk 13.18.4 and older, 14.7.4 and older, 15.1.4 and… CVSS 3.0HIGH 7.5
- TI-2019-13459 An issue was discovered in manager.c in Sangoma Asterisk through 13.x, 16.x, 17.x and… CVSS 3.1HIGH 8.8
- TI-2018-05283 A Buffer Overflow issue was discovered in Asterisk through 13.19.1, 14.x through 14.7.5… CVSS 3.0HIGH 7.5
Sources
- CVE-2016-9937 · CVE Program
- CVE-2016-9937 · NVD
- FIRST EPSS
- GHSA-6qm8-8j44-j9h2 · GitHub Advisory Database · CC BY 4.0
- CVE-2016-9937 · 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