CVE-2012-4434: fwknop before 2.0.3 allow remote authenticated users to cause a denial of service (server crash) or possibly e

Q: How do I fix CVE-2012-4434?

fwknop: upgrade to 2.0.3. Exact commands for each OS are on this page.

Q: Is CVE-2012-4434 being exploited?

CVE-2012-4434 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2012-4434 affect?

CVE-2012-4434 affects fwknop. Severity is high (CVSS 8.8). fwknop before 2.0.3 allow remote authenticated users to cause a denial of service (server crash) or possibly execute arbitrary code.

Q: How urgent is CVE-2012-4434?

Priority 58/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2012-4434 is a high-severity flaw (CVSS 8.8) affecting fwknop. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

fwknop before 2.0.3 allow remote authenticated users to cause a denial of service (server crash) or possibly execute arbitrary code.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	3.3% (top 11%)
CISA exploited list	No
Weakness	CWE-276
Published	2020-01-09
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: cipherdyne

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-01-09 21:15 UTCPublished CVE record published
2026-06-16 23:45 UTCUpdated Record last modified

cipherdyne fwknop UPGRADE

Affected: < 2.0.3

Fixed in: 2.0.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy fwknop || rpm -q fwknop || fwknop --version

2. UPGRADE to 2.0.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade fwknop

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fwknop

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2012-4434?

fwknop: upgrade to 2.0.3. Exact commands for each OS are on this page.

Is CVE-2012-4434 being exploited?

CVE-2012-4434 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2012-4434 affect?

CVE-2012-4434 affects fwknop. Severity is high (CVSS 8.8). fwknop before 2.0.3 allow remote authenticated users to cause a denial of service (server crash) or possibly execute arbitrary code.

How urgent is CVE-2012-4434?

Priority 58/100. High severity; Public exploit reference

References

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