PatchTheCVECVE-2009-3111: The rad_decode function in FreeRADIUS before 1.1.8 allows remote attackers to cause a denial of service (radiu
CVE-2009-3111 is a medium-severity flaw (CVSS 5.0) affecting freeradius. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
The rad_decode function in FreeRADIUS before 1.1.8 allows remote attackers to cause a denial of service (radiusd crash) via zero-length Tunnel-Password attributes, as demonstrated by a certain module in VulnDisco Pack Professional 7.6 through 8.11. NOTE: this is a regression error related to CVE-2003-0967.
Why this priority
- EPSS top 4%: very likely to be exploited
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.0 (Medium) |
| EPSS exploit chance | 11.2% (top 4%) |
| CISA exploited list | No |
| Published | 2009-09-09 |
| Last modified | 2026-06-16 |
Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
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-2009-3111?
freeradius: upgrade to newer than 1.1.7. Exact commands for each OS are on this page.
Is CVE-2009-3111 being exploited?
CVE-2009-3111 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-2009-3111 affect?
CVE-2009-3111 affects freeradius. Severity is medium (CVSS 5.0). The rad_decode function in FreeRADIUS before 1.1.8 allows remote attackers to cause a denial of service (radiusd crash) via zero-length Tunnel-Password attributes, as demonstrated by a certain module in VulnDisco Pack Professional 7.6 throu
How urgent is CVE-2009-3111?
Priority 46/100. EPSS top 4%: very likely to be exploited; Public exploit reference
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