mail() may release string with refcount==1 twice
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.5epss 4.2%
exploitation probability
4.2%top 10% of all CVEs
observed exploitation
nono source reports it
In PHP versions 7.3.x below 7.3.13 and 7.4.0 on Windows, when supplying custom headers to mail() function, due to mistake introduced in commit 78f4b4a2dcf92ddbccea1bb95f8390a18ac3342e, if the header is supplied in lowercase, this can result in double-freeing certain memory locations.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Affected products
PHP Group · PHPReferences
https://bugs.php.net/bug.php?id=78943https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/N7GCOAE6KVHYJ3UQ4KLPLTGSLX6IRVRN/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XWRQPYXVG43Q7DXMXH6UVWMKWGUW552F/https://seclists.org/bugtraq/2020/Feb/27https://security.netapp.com/advisory/ntap-20200103-0002/https://www.debian.org/security/2020/dsa-4626https://www.tenable.com/security/tns-2021-14