Is CVE-2007-4657 being actively exploited?

CVE-2007-4657 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2007-4657?

CVE-2007-4657 has a CVSS 2.0 base score of 7.5 (HIGH).

CVE-2007-4657

HIGH · CVSS 7.5EPSS 3.0%EU EUVD

Multiple integer overflows in PHP 4 before 4.4.8, and PHP 5 before 5.2.4, allow remote attackers to obtain sensitive information (memory contents) or cause a denial of service (thread crash) via a large len value to the (1) strspn or (2) strcspn function, which triggers an out-of-bounds read. NOTE: this affects different product versions than CVE-2007-3996.

Key facts

CVSS score: 7.5 (v2.0)
Severity: HIGH
CVSS vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness (CWE): CWE-119
EPSS score: 3.0% (87th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2007-4639)
Published: September 4, 2007
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2007-4639 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.

View on the EU Vulnerability Database

Affected products

canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
debian / debian linux
debian / debian linux
php / php

References

http://secunia.com/advisories/26642(Third Party Advisory)
http://secunia.com/advisories/26822(Third Party Advisory)
http://secunia.com/advisories/26838(Third Party Advisory)
http://secunia.com/advisories/27102(Third Party Advisory)
http://secunia.com/advisories/27377(Third Party Advisory)
http://secunia.com/advisories/27864(Third Party Advisory)
http://secunia.com/advisories/28249(Third Party Advisory)
http://secunia.com/advisories/28318(Third Party Advisory)
http://secunia.com/advisories/28936(Third Party Advisory)
http://secunia.com/advisories/30288(Third Party Advisory)
http://secweb.se/en/advisories/php-strcspn-information-leak-vulnerability/(Third Party Advisory)
http://slackware.com/security/viewer.php?l=slackware-security&y=2008&m=slackware-security.335136(Mailing List, Third Party Advisory)
http://www.debian.org/security/2008/dsa-1444(Third Party Advisory)
http://www.debian.org/security/2008/dsa-1578(Third Party Advisory)
http://www.gentoo.org/security/en/glsa/glsa-200710-02.xml(Third Party Advisory)
http://www.php.net/ChangeLog-4.php(Vendor Advisory)
http://www.php.net/ChangeLog-5.php#5.2.4(Patch, Vendor Advisory)
http://www.php.net/releases/4_4_8.php(Vendor Advisory)
http://www.php.net/releases/5_2_4.php(Vendor Advisory)
http://www.trustix.org/errata/2007/0026/(Broken Link)
http://www.ubuntu.com/usn/usn-549-2(Broken Link)
http://www.vupen.com/english/advisories/2007/3023(Third Party Advisory)
http://www.vupen.com/english/advisories/2008/0059(Third Party Advisory)
https://exchange.xforce.ibmcloud.com/vulnerabilities/36388(Third Party Advisory, VDB Entry)
https://exchange.xforce.ibmcloud.com/vulnerabilities/39399(Third Party Advisory, VDB Entry)
https://issues.rpath.com/browse/RPL-1693(Broken Link)
https://issues.rpath.com/browse/RPL-1702(Broken Link)
https://launchpad.net/bugs/173043(Third Party Advisory)
https://usn.ubuntu.com/549-1/(Third Party Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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