CVE-2009-3111

FreeRADIUS < 1.1.8 - Denial of Service via Zero-Length Tunnel-Password Attribute

Title source: llm

Exploitation Summary

EIP tracks 1 public exploit for CVE-2009-3111. PoCs published by Matthew Gillespie.

AI-analyzed exploit summary This exploit sends a malformed Radius packet with an invalid authenticator and a zero-length attribute to trigger a denial-of-service (DoS) in FreeRadius. The PoC leverages Scapy to craft and send the malicious packet to the target host.

Description

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.

Exploits (1)

exploitdb WORKING POC VERIFIED

by Matthew Gillespie · pythondosmultiple

https://www.exploit-db.com/exploits/9642

View Code ZIP pw:eip

This exploit sends a malformed Radius packet with an invalid authenticator and a zero-length attribute to trigger a denial-of-service (DoS) in FreeRadius. The PoC leverages Scapy to craft and send the malicious packet to the target host.

Classification

Working Poc 95%

Attack Type

Dos

Complexity

Trivial

Reliability

Reliable

Target: FreeRadius (versions affected by CVE-2009-3111)

No auth needed

Prerequisites: Network access to the target FreeRadius server · Scapy library with Radius support

MITRE ATT&CK

T1499 - Endpoint Denial of Service

devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (13)

Core 13

Core References

Third Party Advisory, VDB Entry vdb-entry x_refsource_bid

http://www.securityfocus.com/bid/36263

Mailing List vendor-advisory x_refsource_suse

http://lists.opensuse.org/opensuse-security-announce/2009-11/msg00004.html

Patch x_refsource_confirm

http://github.com/alandekok/freeradius-server/commit/860cad9e02ba344edb0038419e415fe05a9a01f4

View Patch ZIP pw:eip

Various Sources mailing-list x_refsource_mlist

https://lists.freeradius.org/pipermail/freeradius-users/2009-September/msg00242.html

Third Party Advisory third-party-advisory x_refsource_secunia

http://secunia.com/advisories/36509

Third Party Advisory, VDB Entry vdb-entry signature x_refsource_oval

https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9919

Various Sources x_refsource_misc

http://intevydis.com/vd-list.shtml

Third Party Advisory vdb-entry x_refsource_vupen

http://www.vupen.com/english/advisories/2009/3184

Mailing List vendor-advisory x_refsource_suse

http://lists.opensuse.org/opensuse-security-announce/2009-10/msg00001.html

Mailing List vendor-advisory x_refsource_apple

http://lists.apple.com/archives/security-announce/2009/Nov/msg00000.html

Patch mailing-list x_refsource_mlist

http://www.openwall.com/lists/oss-security/2009/09/09/1

Vendor Advisory vendor-advisory x_refsource_redhat

http://www.redhat.com/support/errata/RHSA-2009-1451.html

Vendor Advisory x_refsource_confirm

http://support.apple.com/kb/HT3937

Scores

EPSS 0.1118

EPSS Percentile 95.4%

Details

Status published

Products (21)

freeradius/freeradius 0.2

freeradius/freeradius 0.3

freeradius/freeradius 0.4

freeradius/freeradius 0.5

freeradius/freeradius 0.8

freeradius/freeradius 0.8.1

freeradius/freeradius 0.9

freeradius/freeradius 0.9.1

freeradius/freeradius 0.9.2

freeradius/freeradius 0.9.3

... and 11 more

Published Sep 09, 2009

Tracked Since Feb 18, 2026