CVE-2019-11049
Low
No strong exploitation signal.
CVSS base
6.5
MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
EPSS — probability of exploitation (30 days)
4.2%
90.5th percentile
CISA KEV
Not listed
Weakness / dates
CWE-415
Published 2019-12-23 · modified 2026-08-17
CVSS breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
| Attack Vector | N | Network |
| Attack Complexity | H | High |
| Privileges Required | N | None |
| User Interaction | N | None |
| Scope | U | Unchanged |
| Confidentiality | N | None |
| Integrity | L | Low |
| Availability | H | High |
Timeline
- 2019-12-23 — Published (NVD)
- 2026-08-17 — Last modified (NVD)
Description
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.
Affected
References
- https://bugs.php.net/bug.php?id=78943
- https://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/27
- https://security.netapp.com/advisory/ntap-20200103-0002/
- https://www.debian.org/security/2020/dsa-4626
- https://www.tenable.com/security/tns-2021-14
- https://bugs.php.net/bug.php?id=78943
- https://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/27
- https://security.netapp.com/advisory/ntap-20200103-0002/
- https://www.debian.org/security/2020/dsa-4626
- https://www.tenable.com/security/tns-2021-14