CVE-2007-2727: 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...

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.

Metrics

EPSS Probability

1.86%

76.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Php	Php	>= 4.4.0, < 4.4.7
Php	Php	>= 5.0.0, < 5.2.2
Php	Php	4.0.1
Php	Php	4.0.2
Php	Php	4.0.3
Php	Php	4.0.4
Php	Php	4.0.5
Php	Php	4.0.6
Php	Php	4.0.7
Php	Php	4.1.0
Php	Php	4.1.1
Php	Php	4.1.2
Php	Php	4.2.0
Php	Php	4.2.1
Php	Php	4.2.2
Php	Php	4.2.3
Php	Php	4.3.0
Php	Php	4.3.1
Php	Php	4.3.2
Php	Php	4.3.3
Php	Php	4.3.4
Php	Php	4.3.5
Php	Php	4.3.6
Php	Php	4.3.7
Php	Php	4.3.8
Php	Php	4.3.9
Php	Php	4.3.10
Php	Php	4.3.11

References

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

Timeline

Published: May 16, 2007
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2007-2727?

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.

How severe is CVE-2007-2727?

Severity scoring for CVE-2007-2727 is pending analysis. The EPSS model estimates a 1.86% probability of exploitation in the next 30 days.

How do I fix CVE-2007-2727?

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.

How Strix Helps

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