CVE-2004-0401: Unknown vulnerability in libtasn1 0.1.x before 0.1.2, and 0.2.x before 0.2.7, related to the DER parsing funct

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HIGH 10.0DOWNGRADE

CVE-2004-0401 is a high-severity flaw (CVSS 10.0) affecting libtasn1. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Unknown vulnerability in libtasn1 0.1.x before 0.1.2, and 0.2.x before 0.2.7, related to the DER parsing functions.

Why this priority

Critical severity

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

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	2.0% (top 20%)
CISA exploited list	No
Published	2004-07-07
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: free software foundation inc.

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

Am I affected?

Timeline

2004-07-07 04:00 UTCPublished CVE record published
2026-06-16 22:05 UTCUpdated Record last modified

free software foundation inc. libtasn1 DOWNGRADE

Affected: 0.1 · 0.1.0 · 0.1.1 · 0.2.0 · 0.2.1 · 0.2.2 · 0.2.3 · 0.2.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.1

1. Check installed version

apt-cache policy libtasn1 || rpm -q libtasn1 || libtasn1 --version

2. No fixed release: DOWNGRADE to a release before 0.1 (Debian / Ubuntu)

apt-cache madison libtasn1 sudo apt install libtasn1=<VERSION_BEFORE_0.1> sudo apt-mark hold libtasn1

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

dnf --showduplicates list libtasn1 sudo dnf downgrade libtasn1-<VERSION_BEFORE_0.1> sudo dnf versionlock add libtasn1

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-2004-0401?

libtasn1: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2004-0401 being exploited?

CVE-2004-0401 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-2004-0401 affect?

CVE-2004-0401 affects libtasn1. Severity is high (CVSS 10.0). Unknown vulnerability in libtasn1 0.1.x before 0.1.2, and 0.2.x before 0.2.7, related to the DER parsing functions.

How urgent is CVE-2004-0401?

Priority 55/100. Critical severity

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References

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