Description
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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | freeradius | 1.1.0-1.2 | — |
| Debian 13 | freeradius | 1.1.0-1.2 | — |
| Debian 12 | freeradius | 1.1.0-1.2 | — |
| Debian 3.1 | freeradius | 1.0.2-4sarge1 | DSA-1089-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 4 | freeradius +3 | 1.0.1-3.RHEL4.3 | RHSA-2006:0271 |
| RHEL 3 | freeradius | 1.0.1-2.RHEL3.2 | RHSA-2006:0271 |
Advisories 2
- RHSA-2006:0271 Red Hat Security Advisory: freeradius security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-1089-1 freeradius - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
References
- GLSA-200604-03 vendor-advisory
- freeradius-eap-mschapv2-auth-bypass(25352) vdb-entry
- 19300 third-party-advisory
- SUSE-SA:2006:019 vendor-advisory
- 17171 vdb-entry
- 20461 third-party-advisory
- 19405 third-party-advisory
- 19811 third-party-advisory
- ADV-2006-1016 vdb-entry
- oval:org.mitre.oval:def:10156 vdb-entry signature
- http://www.freeradius.org/security.html
- DSA-1089 vendor-advisory
- 1015795 vdb-entry
- RHSA-2006:0271 vendor-advisory
- 19527 third-party-advisory
- 2006-0020 vendor-advisory
- MDKSA-2006:060 vendor-advisory
- 19518 third-party-advisory