CVE-2004-2645: Unspecified vulnerability in ASN.1 Compiler (asn1c) before 0.9.7 has unknown impact and attack vectors when pr

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HIGH 10.0DOWNGRADE

CVE-2004-2645 is a high-severity flaw (CVSS 10.0) affecting asn.1 compiler. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Unspecified vulnerability in ASN.1 Compiler (asn1c) before 0.9.7 has unknown impact and attack vectors when processing "CHOICE" types with "indefinite length structures."

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	1.9% (top 20%)
CISA exploited list	No
Published	2004-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: asn.1 compiler

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 22:10 UTCUpdated Record last modified

asn.1 compiler asn.1 compiler DOWNGRADE

Affected: 0.9.4 · 0.9.5 · 0.9.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.9.4

1. Check installed version

apt-cache policy asn.1-compiler || rpm -q asn.1-compiler || asn.1-compiler --version

2. No fixed release: DOWNGRADE to a release before 0.9.4 (Debian / Ubuntu)

apt-cache madison asn.1-compiler sudo apt install asn.1-compiler=<VERSION_BEFORE_0.9.4> sudo apt-mark hold asn.1-compiler

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

dnf --showduplicates list asn.1-compiler sudo dnf downgrade asn.1-compiler-<VERSION_BEFORE_0.9.4> sudo dnf versionlock add asn.1-compiler

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-2004-2645?

asn.1 compiler: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2004-2645 being exploited?

CVE-2004-2645 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-2004-2645 affect?

CVE-2004-2645 affects asn.1 compiler. Severity is high (CVSS 10.0). Unspecified vulnerability in ASN.1 Compiler (asn1c) before 0.9.7 has unknown impact and attack vectors when processing "CHOICE" types with "indefinite length structures."

How urgent is CVE-2004-2645?

Priority 55/100. Critical severity

Related CVEs

CVE-2004-2644 HIGH 10.0 DOWNGRADE Unspecified vulnerability in ASN.1 Compiler (asn1c) before 0.9.7 has unknown impact and attack vectors when pr

References

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