CVE-2004-0403: Racoon before 20040408a allows remote attackers to cause a denial of service (memory consumption) via an ISAKM

Q: How do I fix CVE-2004-0403?

racoon: upgrade to newer than 2004-04-08a. Exact commands for each OS are on this page.

Q: Is CVE-2004-0403 being exploited?

CVE-2004-0403 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-2004-0403 affect?

CVE-2004-0403 affects racoon. Severity is medium (CVSS 5.0). Racoon before 20040408a allows remote attackers to cause a denial of service (memory consumption) via an ISAKMP packet with a large length field.

Q: How urgent is CVE-2004-0403?

Priority 44/100. Public exploit reference

This month

MEDIUM 5.0UPGRADE

CVE-2004-0403 is a medium-severity flaw (CVSS 5.0) affecting racoon. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Racoon before 20040408a allows remote attackers to cause a denial of service (memory consumption) via an ISAKMP packet with a large length field.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	2.9% (top 13%)
CISA exploited list	No
Published	2004-06-01
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: kame

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

Am I affected?

Timeline

2004-06-01 04:00 UTCPublished CVE record published
2026-06-16 22:05 UTCUpdated Record last modified

kame racoon UPGRADE

Affected: <= 2004-04-08a

Fixed in: newer than 2004-04-08a

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2004-04-08a (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade racoon

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-2004-0403?

racoon: upgrade to newer than 2004-04-08a. Exact commands for each OS are on this page.

Is CVE-2004-0403 being exploited?

CVE-2004-0403 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-2004-0403 affect?

CVE-2004-0403 affects racoon. Severity is medium (CVSS 5.0). Racoon before 20040408a allows remote attackers to cause a denial of service (memory consumption) via an ISAKMP packet with a large length field.

How urgent is CVE-2004-0403?

Priority 44/100. Public exploit reference

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CVE-2004-0164 MEDIUM 5.0 DOWNGRADE KAME IKE daemon (racoon) does not properly handle hash values, which allows remote attackers to delete certifi
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References

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