CVE-2012-4435

fwknop before 2.0.3 does not properly validate IP addresses, which allows remote authenticated...

4.0 MediumFix available

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.

Exploit likelihood

2.33%Up 1.1 points since Feb 4, 2022

What each source reports

NVD Score used 4.0

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.

Record: CVE-2012-4435
CVSS 2.0: 4.0 MediumAV:N/AC:L/Au:S/C:N/I:N/A:P
Weakness: CWE-20
Updated: 2026-11-02

CVE List No score

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.

Record: CVE-2012-4435
Updated: 2026-11-02

EUVDEUVD-2012-4369 No score

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.

Record: EUVD-2012-4369
Updated: 2026-11-03

GitHub AdvisoriesGHSA-jvjc-qf53-pgj7 No score

fwknop before 2.0.3 does not properly validate IP addresses, which allows remote authenticated...

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.

Record: GHSA-jvjc-qf53-pgj7
Weakness: CWE-20
Updated: 2026-11-02

OSV No score

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.

Record: CVE-2012-4435
Updated: 2026-11-02

OSVDEBIAN-CVE-2012-4435 No score

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.

Record: DEBIAN-CVE-2012-4435
Updated: 2026-11-02

Affected products

cipherdyne fwknop

Affected packages

Affected packages
Package	Affected	Fixed
`fwknop` Debian:12	before 2.0.3-1	2.0.3-1
`fwknop` Debian:13	before 2.0.3-1	2.0.3-1
`fwknop` Debian:14	before 2.0.3-1	2.0.3-1

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2012-4435 is a medium vulnerability (CVSS 4.0) in Cipherdyne Fwknop, published October 22, 2012. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.33%, the 83rd percentile. Fixed in fwknop 2.0.3-1.

References

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