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Vulnerability record · CVE-2007-2727 · published 16 May 2007

CVE-2007-2727: Php vulnerability

Php · Php

The mcrypt_create_iv function in ext/mcrypt/mcrypt.c in PHP before 4.4.7, 5.2.1, and possibly 5.0.x and other PHP 5 versions, calls php_rand_r with an uninitialized seed variable and therefore always generates the same initialization vector (IV), which might allow context-dependent attackers to decrypt certain data more easily because of the guessable encryption keys.

2.6 CVSS 2.0 Low EPSS 1.9% · top 21.2%
2.6CVSS 2.0 base score
1.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
20References, 2 tagged exploit
16 Jun 2026Last modified by NVD

Description

The mcrypt_create_iv function in ext/mcrypt/mcrypt.c in PHP before 4.4.7, 5.2.1, and possibly 5.0.x and other PHP 5 versions, calls php_rand_r with an uninitialized seed variable and therefore always generates the same initialization vector (IV), which might allow context-dependent attackers to decrypt certain data more easily because of the guessable encryption keys.

AV:N/AC:H/Au:N/C:P/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://blog.php-security.org/archives/80-Watching-the-PHP-CVS.html Vendor Advisory
http://bugs.php.net/bug.php?id=40999 Vendor Advisory
http://cvs.php.net/viewvc.cgi/php-src/ext/mcrypt/mcrypt.c?r1=1.91.2.3.2.9&r2=1.91.2.3.2.10 Vendor Advisory
http://osvdb.org/36087 Broken Link
http://secunia.com/advisories/26895 Broken Link
http://www.fortheloot.com/public/mcrypt.patch ExploitPatchThird Party Advisory
http://www.mandriva.com/security/advisories?name=MDKSA-2007:187 Broken Link
http://www.novell.com/linux/security/advisories/2007_15_sr.html Third Party Advisory
http://www.php.net/ChangeLog-5.php Vendor Advisory
http://www.securityfocus.com/bid/23984 Third Party AdvisoryVDB Entry
http://blog.php-security.org/archives/80-Watching-the-PHP-CVS.html Vendor Advisory
http://bugs.php.net/bug.php?id=40999 Vendor Advisory
http://cvs.php.net/viewvc.cgi/php-src/ext/mcrypt/mcrypt.c?r1=1.91.2.3.2.9&r2=1.91.2.3.2.10 Vendor Advisory
http://osvdb.org/36087 Broken Link
http://secunia.com/advisories/26895 Broken Link
http://www.fortheloot.com/public/mcrypt.patch ExploitPatchThird Party Advisory
http://www.mandriva.com/security/advisories?name=MDKSA-2007:187 Broken Link
http://www.novell.com/linux/security/advisories/2007_15_sr.html Third Party Advisory
http://www.php.net/ChangeLog-5.php Vendor Advisory
http://www.securityfocus.com/bid/23984 Third Party AdvisoryVDB Entry

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2007-2727), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.