Buffer overflow in the run_last_args function in client/fwknop.c in fwknop before 2.0.3…
Priority LOW 21CWE-119Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Medium
- Impact type
- Code execution
- Confidentiality · integrity · availability
- Partial · Partial · Partial
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.
Summary
Buffer overflow in the run_last_args function in client/fwknop.c in fwknop before 2.0.3, when processing --last, might allow local users to cause a denial of service (client crash) and possibly execute arbitrary code via many .fwknop.run arguments.
Why it matters now
EPSS 0.00656 51st 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 · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:cipherdyne:fwknop:*:*:*:*:*:*:*:* | up to 2.0.2 | Vulnerable | Cipherdyne |
| cpe:2.3:a:cipherdyne:fwknop:2.0:*:*:*:*:*:*:* | 2.0 | Vulnerable | Cipherdyne |
| cpe:2.3:a:cipherdyne:fwknop:2.0.1:*:*:*:*:*:*:* | 2.0.1 | Vulnerable | Cipherdyne |
- cpe:2.3:a:cipherdyne:fwknop:*:*:*:*:*:*:*:* Versions up to 2.0.2 Vulnerable ·Cipherdyne
- cpe:2.3:a:cipherdyne:fwknop:2.0:*:*:*:*:*:*:* Versions 2.0 Vulnerable ·Cipherdyne
- cpe:2.3:a:cipherdyne:fwknop:2.0.1:*:*:*:*:*:*:* Versions 2.0.1 Vulnerable ·Cipherdyne
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2012-4436
- 2026-10-03 Alias added: GHSA-f5j9-5h8m-c8mw
- 2026-10-13 EPSS moved to the 50th–90th percentile
References
More Cipherdyne Fwknop vulnerabilities
- TI-2012-03776 Incorrect default permissions in fwknop CVSS 3.1HIGH 8.8
- TI-2012-03777 fwknop before 2.0.3 does not properly validate IP addresses, which allows remote… CVSS 2.0MEDIUM 4.0
Sources
- CVE-2012-4436 · CVE Program
- CVE-2012-4436 · NVD
- FIRST EPSS
- GHSA-f5j9-5h8m-c8mw · GitHub Advisory Database · CC BY 4.0
- CVE-2012-4436 · 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