CVE-2006-1354: Unspecified vulnerability in FreeRADIUS 1.0.0 up to 1.1.0 allows remote attackers to bypass authentication or

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HIGH 7.5DOWNGRADE

CVE-2006-1354 is a high-severity flaw (CVSS 7.5) affecting freeradius. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Unspecified vulnerability in FreeRADIUS 1.0.0 up to 1.1.0 allows remote attackers to bypass authentication or cause a denial of service (server crash) via "Insufficient input validation" in the EAP-MSCHAPv2 state machine module.

Why this priority

High severity

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	2.8% (top 13%)
CISA exploited list	No
Published	2006-03-22
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: freeradius

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

Am I affected?

Timeline

2006-03-22 02:02 UTCPublished CVE record published
2026-06-16 22:22 UTCUpdated Record last modified

freeradius freeradius DOWNGRADE

Affected: 1.0.0 · 1.0.1 · 1.0.2 · 1.0.3 · 1.0.4 · 1.0.5 · 1.1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison freeradius sudo apt install freeradius=<VERSION_BEFORE_1.0.0> sudo apt-mark hold freeradius

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

dnf --showduplicates list freeradius sudo dnf downgrade freeradius-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add freeradius

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-2006-1354?

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

Is CVE-2006-1354 being exploited?

CVE-2006-1354 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-2006-1354 affect?

CVE-2006-1354 affects freeradius. Severity is high (CVSS 7.5). Unspecified vulnerability in FreeRADIUS 1.0.0 up to 1.1.0 allows remote attackers to bypass authentication or cause a denial of service (server crash) via "Insufficient input validation" in the EAP-MSCHAPv2 state machine module.

How urgent is CVE-2006-1354?

Priority 48/100. High severity

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References

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