CVE-2022-41860: In freeradius, when an EAP-SIM supplicant sends an unknown SIM option, the server will try to look that option

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HIGH 7.5REMOTEUPGRADE

CVE-2022-41860 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.

In freeradius, when an EAP-SIM supplicant sends an unknown SIM option, the server will try to look that option up in the internal dictionaries. This lookup will fail, but the SIM code will not check for that failure. Instead, it will dereference a NULL pointer, and cause the server to crash.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 31%)
CISA exploited list	No
Weakness	CWE-476
Published	2023-01-17
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: freeradius

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-01-17 18:15 UTCPublished CVE record published
2026-06-17 05:03 UTCUpdated Record last modified

freeradius freeradius UPGRADE

Affected: >= 0.9.3 and <= 3.0.25

Fixed in: newer than 3.0.25

Safe to downgrade to: a release before 0.9.3

1. Check installed version

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

2. UPGRADE to newer than 3.0.25 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade freeradius

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade freeradius

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 0.9.3 (Debian / Ubuntu)

apt-cache madison freeradius sudo apt install freeradius=<VERSION_BEFORE_0.9.3> sudo apt-mark hold freeradius

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list freeradius sudo dnf downgrade freeradius-<VERSION_BEFORE_0.9.3> 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-2022-41860?

freeradius: upgrade to newer than 3.0.25. Exact commands for each OS are on this page.

Is CVE-2022-41860 being exploited?

CVE-2022-41860 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-2022-41860 affect?

CVE-2022-41860 affects freeradius. Severity is high (CVSS 7.5). In freeradius, when an EAP-SIM supplicant sends an unknown SIM option, the server will try to look that option up in the internal dictionaries. This lookup will fail, but the SIM code will not check for that failure. Instead, it will derefe

How urgent is CVE-2022-41860?

Priority 48/100. High severity; Remotely exploitable, no login, no user action

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References

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