fwknop before 2.0.3 does not properly validate IP addresses, which allows remote…
Priority LOW 23CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Partial
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA.
Summary
fwknop before 2.0.3 does not properly validate IP addresses, which allows remote authenticated users to cause a denial of service (server crash) via a long IP address.
Why it matters now
EPSS 0.02329 83rd 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-2012-4435
- 2026-10-03 Alias added: GHSA-jvjc-qf53-pgj7
References
Other 5
- [oss-security] 20120919 CVE Request -- fwknop 2.0.3: Multiple security issues
- [oss-security] 20120919 Re: CVE Request -- fwknop 2.0.3: Multiple security issues
- http://www.cipherdyne.org/cgi-bin/gitweb.cgi?p=fwknop.git%3Ba=commitdiff%3Bh=263fa01f2af1d336961df320f1c7a9ea84ddac9a
- http://www.cipherdyne.org/cgi-bin/gitweb.cgi?p=fwknop.git%3Ba=commitdiff%3Bh=f4c16bc47fc24a96b63105556b62d61c1ba7d799
- [oss-security] 20120919 Re: CVE Request -- fwknop 2.0.3: Multiple security issues
More Cipherdyne Fwknop vulnerabilities
- TI-2012-03776 Incorrect default permissions in fwknop CVSS 3.1HIGH 8.8
- TI-2012-03778 Buffer overflow in the run_last_args function in client/fwknop.c in fwknop before 2.0.3… CVSS 2.0MEDIUM 4.4
Sources
- CVE-2012-4435 · CVE Program
- CVE-2012-4435 · NVD
- FIRST EPSS
- GHSA-jvjc-qf53-pgj7 · GitHub Advisory Database · CC BY 4.0
- CVE-2012-4435 · 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