CVE-2022-41860Network attack vector

Server crash via unchecked EAP-SIM lookup

Published Jan 17, 2023 · Updated Nov 3, 2025

Denial of service in FreeRADIUS Server 0.9.3 through 3.0.25 allows remote attackers to crash the server via an unknown EAP-SIM option. In unmap_eapsim_basictypes, a failed dictionary lookup returns a null value that the attribute-decoding loop dereferences without checking. Exposure requires manual EAP-SIM configuration because the module is disabled by default, and the documented consequence is limited to a server crash.

CVSS severity7.5
High
EPSS probability1.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in FreeRADIUS Server 0.9.3 through 3.0.25 allows remote attackers to crash the server via an unknown EAP-SIM option. In unmap_eapsim_basictypes, a failed dictionary lookup returns a null value that the attribute-decoding loop dereferences without checking. Exposure requires manual EAP-SIM configuration because the module is disabled by default, and the documented consequence is limited to a server crash.

The record

CVE
CVE-2022-41860
Published
Jan 17, 2023
Updated
Nov 3, 2025
Vendor
FreeRADIUS
Product
FreeRADIUS Server
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 17, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=All versions from 0.9.3 to 3.0.25

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FreeRADIUS · FreeRADIUS Serverversion=All versions from 0.9.3 to 3.0.25

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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