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    CVE-2006-0459

    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.

    Published:Mar 29, 2006
    Last Modified:Apr 16, 2026
    EPS:Mar 29, 2006
    EPSS Score:0.0397
    CVSS Score:7.5

    Affected Products

    Vendor
    Westes
    Product
    Flex

    Exploits

    No exploit reference

    References

    http://prdownloads.sourceforge.net/flex/flex-2.5.33.tar.bz2?download
    http://secunia.com/advisories/19071
    http://secunia.com/advisories/19126
    http://secunia.com/advisories/19228
    http://secunia.com/advisories/19424
    http://securityreason.com/securityalert/570
    http://sourceforge.net/mailarchive/forum.php?thread_name=20060223020346.GA11231%40tabitha.home.tldz.org&forum_name=flex-announce
    http://www.gentoo.org/security/en/glsa/glsa-200603-07.xml
    http://www.osvdb.org/23440
    http://www.securityfocus.com/bid/16896
    http://www.us.debian.org/security/2006/dsa-1020
    http://www.vupen.com/english/advisories/2006/0770
    https://exchange.xforce.ibmcloud.com/vulnerabilities/24995
    https://usn.ubuntu.com/260-1/
    http://prdownloads.sourceforge.net/flex/flex-2.5.33.tar.bz2?download
    http://secunia.com/advisories/19071
    http://secunia.com/advisories/19126
    http://secunia.com/advisories/19228
    http://secunia.com/advisories/19424
    http://securityreason.com/securityalert/570
    http://sourceforge.net/mailarchive/forum.php?thread_name=20060223020346.GA11231%40tabitha.home.tldz.org&forum_name=flex-announce
    http://www.gentoo.org/security/en/glsa/glsa-200603-07.xml
    http://www.osvdb.org/23440
    http://www.securityfocus.com/bid/16896
    http://www.us.debian.org/security/2006/dsa-1020
    http://www.vupen.com/english/advisories/2006/0770
    https://exchange.xforce.ibmcloud.com/vulnerabilities/24995
    https://usn.ubuntu.com/260-1/

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High