CVE-2006-0459

Name: CVE-2006-0459
Creator: NVD / NIST
Published: 2006-03-29T23:02:00+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 4.77%

Last modified Jun 16, 2026

CVE-2006-0459 is a vulnerability of currently unknown severity. flex.skl in Will Estes and John Millaway Fast Lexical Analyzer Generator (flex) before 2.5.33 does not allocate enough memory for grammars containing (1) REJECT statements or (2) trailing context rules, which causes flex to generate code that contains a buffer overflow that might allow context-dependent attackers to execute arbitrary code.. EPSS estimates a 4.77% chance of exploitation in the next 30 days.

Description

flex.skl in Will Estes and John Millaway Fast Lexical Analyzer Generator (flex) before 2.5.33 does not allocate enough memory for grammars containing (1) REJECT statements or (2) trailing context rules, which causes flex to generate code that contains a buffer overflow that might allow context-dependent attackers to execute arbitrary code.

Metrics

EPSS Probability

4.77%

90.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-119

Affected Software

Vendor	Product	Versions
Westes	Flex	<= 2.5.32

References

http://prdownloads.sourceforge.net/flex/flex-2.5.33.tar.bz2?downloadProduct
http://secunia.com/advisories/19071Patch, Vendor Advisory
http://secunia.com/advisories/19126Vendor Advisory
http://secunia.com/advisories/19228Vendor Advisory
http://secunia.com/advisories/19424Patch, Vendor Advisory
http://securityreason.com/securityalert/570Third Party Advisory
http://sourceforge.net/mailarchive/forum.php?thread_name=20060223020346.GA11231%40tabitha.home.tldz.org&forum_name=flex-announceRelease Notes
http://www.gentoo.org/security/en/glsa/glsa-200603-07.xmlThird Party Advisory
http://www.osvdb.org/23440Broken Link, Patch
http://www.securityfocus.com/bid/16896Patch, Third Party Advisory, VDB Entry
http://www.us.debian.org/security/2006/dsa-1020Patch, Vendor Advisory
http://www.vupen.com/english/advisories/2006/0770Broken Link, URL Repurposed
https://exchange.xforce.ibmcloud.com/vulnerabilities/24995VDB Entry
https://usn.ubuntu.com/260-1/Third Party Advisory
http://prdownloads.sourceforge.net/flex/flex-2.5.33.tar.bz2?downloadProduct
http://secunia.com/advisories/19071Patch, Vendor Advisory
http://secunia.com/advisories/19126Vendor Advisory
http://secunia.com/advisories/19228Vendor Advisory
http://secunia.com/advisories/19424Patch, Vendor Advisory
http://securityreason.com/securityalert/570Third Party Advisory
http://sourceforge.net/mailarchive/forum.php?thread_name=20060223020346.GA11231%40tabitha.home.tldz.org&forum_name=flex-announceRelease Notes
http://www.gentoo.org/security/en/glsa/glsa-200603-07.xmlThird Party Advisory
http://www.osvdb.org/23440Broken Link, Patch
http://www.securityfocus.com/bid/16896Patch, Third Party Advisory, VDB Entry
http://www.us.debian.org/security/2006/dsa-1020Patch, Vendor Advisory
http://www.vupen.com/english/advisories/2006/0770Broken Link, URL Repurposed
https://exchange.xforce.ibmcloud.com/vulnerabilities/24995VDB Entry
https://usn.ubuntu.com/260-1/Third Party Advisory

Timeline

Published: Mar 29, 2006
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2006-0459?

How severe is CVE-2006-0459?

Severity scoring for CVE-2006-0459 is pending analysis. The EPSS model estimates a 4.77% probability of exploitation in the next 30 days.

How do I fix CVE-2006-0459?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2006-0459?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST