mb_strtolower (UTF-32LE): stack-buffer-overflow at php_unicode_tolower_full
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.4epss 4.8%
exploitation probability
4.8%top 9% of all CVEs
observed exploitation
nono source reports it
In PHP versions 7.3.x below 7.3.16 and 7.4.x below 7.4.4, while using mb_strtolower() function with UTF-32LE encoding, certain invalid strings could cause PHP to overwrite stack-allocated buffer. This could lead to memory corruption, crashes and potentially code execution.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
Affected products
PHP Group · PHPReferences
https://bugs.php.net/bug.php?id=79371https://security.netapp.com/advisory/ntap-20200403-0001/https://usn.ubuntu.com/4330-1/https://usn.ubuntu.com/4330-2/https://www.debian.org/security/2020/dsa-4719https://www.oracle.com/security-alerts/cpuoct2021.htmlhttps://www.php.net/ChangeLog-7.php#7.4.4https://www.tenable.com/security/tns-2021-14