CVE-2005-4321: The Internet Key Exchange version 1 (IKEv1) implementation in Apani Networks EpiForce 1.9 and earlier running

Q: How do I fix CVE-2005-4321?

epiforce agent: upgrade to newer than 1.9. Exact commands for each OS are on this page.

Q: Is CVE-2005-4321 being exploited?

CVE-2005-4321 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-2005-4321 affect?

CVE-2005-4321 affects epiforce agent. Severity is high (CVSS 7.8). The Internet Key Exchange version 1 (IKEv1) implementation in Apani Networks EpiForce 1.9 and earlier running IPSec, allow remote attackers to cause a denial of service (crash) via certain IKE packets, as demonstrated by the PROTOS ISAKMP T

This month

HIGH 7.8UPGRADE

CVE-2005-4321 is a high-severity flaw (CVSS 7.8) affecting epiforce agent. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Internet Key Exchange version 1 (IKEv1) implementation in Apani Networks EpiForce 1.9 and earlier running IPSec, allow remote attackers to cause a denial of service (crash) via certain IKE packets, as demonstrated by the PROTOS ISAKMP Test Suite for IKEv1. NOTE: due to the lack of details in the advisory, it is unclear which of CVE-2005-3666, CVE-2005-3667, and/or CVE-2005-3668 this issue applies to.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
EPSS exploit chance	2.6% (top 15%)
CISA exploited list	No
Published	2005-12-17
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: apani networks

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

Am I affected?

Timeline

2005-12-17 11:03 UTCPublished CVE record published
2026-06-16 22:18 UTCUpdated Record last modified

apani networks epiforce agent UPGRADE

Affected: <= 1.9

Fixed in: newer than 1.9

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy epiforce-agent || rpm -q epiforce-agent || epiforce-agent --version

2. UPGRADE to newer than 1.9 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade epiforce-agent

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade epiforce-agent

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-2005-4321?

epiforce agent: upgrade to newer than 1.9. Exact commands for each OS are on this page.

Is CVE-2005-4321 being exploited?

CVE-2005-4321 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-2005-4321 affect?

CVE-2005-4321 affects epiforce agent. Severity is high (CVSS 7.8). The Internet Key Exchange version 1 (IKEv1) implementation in Apani Networks EpiForce 1.9 and earlier running IPSec, allow remote attackers to cause a denial of service (crash) via certain IKE packets, as demonstrated by the PROTOS ISAKMP T

How urgent is CVE-2005-4321?

Priority 49/100. High severity

References

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