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    CVE-2006-4020

    scanf.c in PHP 5.1.4 and earlier, and 4.4.3 and earlier, allows context-dependent attackers to execute arbitrary code via a sscanf PHP function call that performs argument swapping, which increments an index past the end of an array and triggers a buffer over-read.

    Published:Aug 4, 2006
    Last Modified:Apr 16, 2026
    EPS:Aug 8, 2006
    EPSS Score:0.0586
    CVSS Score:4.6

    Affected Products

    Vendor
    Php
    Product
    Php
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Application Stack
    Vendor
    Redhat
    Product
    Rhel Stronghold

    Exploits

    http://bugs.php.net/bug.php?id=38322http://www.plain-text.info/sscanf_bug.txthttp://www.securityfocus.com/archive/1/442438/30/0/threadedhttp://bugs.php.net/bug.php?id=38322http://www.plain-text.info/sscanf_bug.txthttp://www.securityfocus.com/archive/1/442438/30/0/threadedhttps://www.exploit-db.com/exploits/2193

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-14355 (CVSS 5.6) — In PHP versions 8.2.* before 8.2.32, 8.3.* before 8.3.32, 8.4.* before 8.4.23, 8.5.* before 8.5.8, the AES-WRA…
    CVE-2026-7263 (CVSS 6.3) — In PHP versions 8.4.* before 8.4.21 and 8.5.* before 8.5.6, DOMNode::C14N() method may process the XML data in…
    CVE-2026-6104 (CVSS 6.3) — In PHP versions 8.4.* before 8.4.21 and 8.5.* before 8.5.6, when an encoding name containing an embedded NUL b…
    CVE-2026-7258 (CVSS 6.3) — In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, some fu…
    CVE-2026-6722 (CVSS 9.5) — In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, the SOA…
    CVE-2026-7259 (CVSS 2.1) — In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, a misma…
    CVE-2026-7261 (CVSS 6.3) — In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, when So…
    CVE-2026-7262 (CVSS 2.9) — In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, when a …
    CVE-2025-14179 (CVSS 7.4) — In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, the PDO…
    CVE-2026-7568 (CVSS 6.3) — In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, the met…

    References

    ftp://patches.sgi.com/support/free/security/advisories/20061001-01-P.asc
    http://bugs.php.net/bug.php?id=38322
    http://rhn.redhat.com/errata/RHSA-2006-0688.html
    http://rhn.redhat.com/errata/RHSA-2006-0736.html
    http://secunia.com/advisories/21403
    http://secunia.com/advisories/21467
    http://secunia.com/advisories/21546
    http://secunia.com/advisories/21608
    http://secunia.com/advisories/21683
    http://secunia.com/advisories/21768
    http://secunia.com/advisories/21847
    http://secunia.com/advisories/22004
    http://secunia.com/advisories/22039
    http://secunia.com/advisories/22069
    http://secunia.com/advisories/22440
    http://secunia.com/advisories/22487
    http://secunia.com/advisories/22538
    http://secunia.com/advisories/23247
    http://security.gentoo.org/glsa/glsa-200608-28.xml
    http://securityreason.com/securityalert/1341
    http://securitytracker.com/id?1016984
    http://support.avaya.com/elmodocs2/security/ASA-2006-221.htm
    http://support.avaya.com/elmodocs2/security/ASA-2006-222.htm
    http://support.avaya.com/elmodocs2/security/ASA-2006-223.htm
    http://www.mandriva.com/security/advisories?name=MDKSA-2006:144
    http://www.novell.com/linux/security/advisories/2006_19_sr.html
    http://www.novell.com/linux/security/advisories/2006_20_sr.html
    http://www.novell.com/linux/security/advisories/2006_22_sr.html
    http://www.novell.com/linux/security/advisories/2006_52_php.html
    http://www.php.net/ChangeLog-5.php#5.1.5
    http://www.php.net/release_5_1_5.php
    http://www.plain-text.info/sscanf_bug.txt
    http://www.redhat.com/support/errata/RHSA-2006-0669.html
    http://www.redhat.com/support/errata/RHSA-2006-0682.html
    http://www.securityfocus.com/archive/1/442438/30/0/threaded
    http://www.securityfocus.com/bid/19415
    http://www.ubuntu.com/usn/usn-342-1
    http://www.vupen.com/english/advisories/2006/3193
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11062
    ftp://patches.sgi.com/support/free/security/advisories/20061001-01-P.asc
    http://bugs.php.net/bug.php?id=38322
    http://rhn.redhat.com/errata/RHSA-2006-0688.html
    http://rhn.redhat.com/errata/RHSA-2006-0736.html
    http://secunia.com/advisories/21403
    http://secunia.com/advisories/21467
    http://secunia.com/advisories/21546
    http://secunia.com/advisories/21608
    http://secunia.com/advisories/21683
    http://secunia.com/advisories/21768
    http://secunia.com/advisories/21847
    http://secunia.com/advisories/22004
    http://secunia.com/advisories/22039
    http://secunia.com/advisories/22069
    http://secunia.com/advisories/22440
    http://secunia.com/advisories/22487
    http://secunia.com/advisories/22538
    http://secunia.com/advisories/23247
    http://security.gentoo.org/glsa/glsa-200608-28.xml
    http://securityreason.com/securityalert/1341
    http://securitytracker.com/id?1016984
    http://support.avaya.com/elmodocs2/security/ASA-2006-221.htm
    http://support.avaya.com/elmodocs2/security/ASA-2006-222.htm
    http://support.avaya.com/elmodocs2/security/ASA-2006-223.htm
    http://www.mandriva.com/security/advisories?name=MDKSA-2006:144
    http://www.novell.com/linux/security/advisories/2006_19_sr.html
    http://www.novell.com/linux/security/advisories/2006_20_sr.html
    http://www.novell.com/linux/security/advisories/2006_22_sr.html
    http://www.novell.com/linux/security/advisories/2006_52_php.html
    http://www.php.net/ChangeLog-5.php#5.1.5
    http://www.php.net/release_5_1_5.php
    http://www.plain-text.info/sscanf_bug.txt
    http://www.redhat.com/support/errata/RHSA-2006-0669.html
    http://www.redhat.com/support/errata/RHSA-2006-0682.html
    http://www.securityfocus.com/archive/1/442438/30/0/threaded
    http://www.securityfocus.com/bid/19415
    http://www.ubuntu.com/usn/usn-342-1
    http://www.vupen.com/english/advisories/2006/3193
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11062

    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