CVE-2004-2283: Unknown vulnerability in DansGuardian before 2.6.1-13 allows remote attackers to bypass URL filters via a craf

Routine

MEDIUM 5.0DOWNGRADE

CVE-2004-2283 is a medium-severity flaw (CVSS 5.0) affecting dansguardian. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Unknown vulnerability in DansGuardian before 2.6.1-13 allows remote attackers to bypass URL filters via a crafted request that causes a page to be added to the clean page cache.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.4% (top 27%)
CISA exploited list	No
Published	2004-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: daniel barron

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

Am I affected?

Timeline

2004-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:09 UTCUpdated Record last modified

daniel barron dansguardian DOWNGRADE

Affected: 2.6.1.8 · 2.6.1.9 · 2.6.1.10 · 2.6.1.11 · 2.6.1.12

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.6.1.8

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.6.1.8 (Debian / Ubuntu)

apt-cache madison dansguardian sudo apt install dansguardian=<VERSION_BEFORE_2.6.1.8> sudo apt-mark hold dansguardian

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

dnf --showduplicates list dansguardian sudo dnf downgrade dansguardian-<VERSION_BEFORE_2.6.1.8> sudo dnf versionlock add dansguardian

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.

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-2004-2283?

dansguardian: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2004-2283 being exploited?

CVE-2004-2283 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-2004-2283 affect?

CVE-2004-2283 affects dansguardian. Severity is medium (CVSS 5.0). Unknown vulnerability in DansGuardian before 2.6.1-13 allows remote attackers to bypass URL filters via a crafted request that causes a page to be added to the clean page cache.

How urgent is CVE-2004-2283?

Priority 36/100. No elevated risk signals yet.

Related CVEs

CVE-2004-2282 MEDIUM 5.0 DOWNGRADE DansGuardian before 2.7.7-2 allows remote attackers to bypass URL filters via a ".." in the request.
CVE-2004-2065 HIGH 7.5 DOWNGRADE DansGuardian 2.8 and earlier allows remote attackers to bypass the extension filtering rule via a hex encoded
CVE-2003-1506 MEDIUM 4.3 DOWNGRADE Cross-site scripting (XSS) vulnerability in dansguardian.pl in Adelix CensorNet 3.0 through 3.2 allows remote
CVE-2002-1599 HIGH 7.5 DOWNGRADE DansGuardian before 2.4.5-1 allows remote attackers to bypass content filtering rules via hex-encoded URLs.

References

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