CVE-2004-0466: WebConnect 6.5, 6.4.4, and possibly earlier versions allows remote attackers to cause a denial of service (han

This month

MEDIUM 5.0DOWNGRADE

CVE-2004-0466 is a medium-severity flaw (CVSS 5.0) affecting webconnect. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

WebConnect 6.5, 6.4.4, and possibly earlier versions allows remote attackers to cause a denial of service (hang) via a URL containing an MS-DOS device name such as (1) AUX, (2) CON, (3) PRN, (4) COM1, or (5) LPT1.

Why this priority

EPSS top 10%: very likely to be exploited

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	4.0% (top 10%)
CISA exploited list	No
Published	2004-02-21
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: openconnect

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

Am I affected?

Timeline

2004-02-21 05:00 UTCPublished CVE record published
2026-06-16 22:05 UTCUpdated Record last modified

openconnect webconnect DOWNGRADE

Affected: 6.4.4 · 6.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.4.4

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 6.4.4 (Debian / Ubuntu)

apt-cache madison webconnect sudo apt install webconnect=<VERSION_BEFORE_6.4.4> sudo apt-mark hold webconnect

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

dnf --showduplicates list webconnect sudo dnf downgrade webconnect-<VERSION_BEFORE_6.4.4> sudo dnf versionlock add webconnect

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-2004-0466?

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

Is CVE-2004-0466 being exploited?

CVE-2004-0466 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-2004-0466 affect?

CVE-2004-0466 affects webconnect. Severity is medium (CVSS 5.0). WebConnect 6.5, 6.4.4, and possibly earlier versions allows remote attackers to cause a denial of service (hang) via a URL containing an MS-DOS device name such as (1) AUX, (2) CON, (3) PRN, (4) COM1, or (5) LPT1.

How urgent is CVE-2004-0466?

Priority 40/100. EPSS top 10%: very likely to be exploited

Related CVEs

CVE-2004-0465 MEDIUM 5.0 DOWNGRADE Directory traversal vulnerability in jretest.html in WebConnect 6.5 and 6.4.4, and possibly earlier versions,

References

← Back to latest CVEs