CVE-2004-0607: The eay_check_x509cert function in KAME Racoon successfully verifies certificates even when OpenSSL validation

This week

HIGH 10.0WATCHLISTDOWNGRADEDOWNGRADEMITIGATE

CVE-2004-0607 is a high-severity flaw (CVSS 10.0) affecting ipsec-tools, racoon, enterprise linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The eay_check_x509cert function in KAME Racoon successfully verifies certificates even when OpenSSL validation fails, which could allow remote attackers to bypass authentication.

Why this priority

Critical severity
EPSS top 7%: very likely to be exploited
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	5.4% (top 7%)
CISA exploited list	No
Published	2004-12-06
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: ipsec-tools · kame · redhat

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

Am I affected?

Timeline

2004-12-06 05:00 UTCPublished CVE record published
2026-06-16 22:05 UTCUpdated Record last modified

ipsec-tools ipsec-tools DOWNGRADE

Affected: 0.3 · 0.3.1 · 0.3.2 · 0.3_rc1 · 0.3_rc2 · 0.3_rc3 · 0.3_rc4 · 0.3_rc5

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.3

1. Check installed version

apt-cache policy ipsec-tools || rpm -q ipsec-tools || ipsec-tools --version

2. No fixed release: DOWNGRADE to a release before 0.3 (Debian / Ubuntu)

apt-cache madison ipsec-tools sudo apt install ipsec-tools=<VERSION_BEFORE_0.3> sudo apt-mark hold ipsec-tools

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list ipsec-tools sudo dnf downgrade ipsec-tools-<VERSION_BEFORE_0.3> sudo dnf versionlock add ipsec-tools

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

kame racoon DOWNGRADE

Affected: all versions · 2003-07-11 · 2004-04-05 · 2004-04-07b · 2004-05-03

Fixed in: no fixed release known

Safe to downgrade to: a release before 2003-07-11

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2003-07-11 (Debian / Ubuntu)

apt-cache madison racoon sudo apt install racoon=<VERSION_BEFORE_2003-07-11> sudo apt-mark hold racoon

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list racoon sudo dnf downgrade racoon-<VERSION_BEFORE_2003-07-11> sudo dnf versionlock add racoon

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

redhat enterprise linux MITIGATE

Affected: 3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

redhat enterprise linux desktop MITIGATE

Affected: 3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2004-0607?

ipsec-tools: downgrade or apply the listed mitigation; racoon: downgrade or apply the listed mitigation; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2004-0607 being exploited?

CVE-2004-0607 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-2004-0607 affect?

CVE-2004-0607 affects ipsec-tools, racoon, enterprise linux. Severity is high (CVSS 10.0). The eay_check_x509cert function in KAME Racoon successfully verifies certificates even when OpenSSL validation fails, which could allow remote attackers to bypass authentication.

How urgent is CVE-2004-0607?

Priority 63/100. Critical severity; EPSS top 7%: very likely to be exploited; On your watchlist

Software pages

OpenSSL vulnerabilities

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References

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