HOMEVULNERABILITIESCVE-2019-11049
CRITICAL

CVE-2019-11049

CWE-415Published: December 23, 2019· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2019-11049 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Debian1 product(s)
debian linux
Fedora1 product(s)
fedora
Microsoft1 product(s)
windows
PHP1 product(s)
php
tenable1 product(s)
securitycenter
Source: NVD CPE · 7 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://bugs.php.net/bug.php?id=78943
PATCHhttps://bugs.php.net/bug.php?id=78943
ADVISORYhttps://seclists.org/bugtraq/2020/Feb/27
ADVISORYhttps://security.netapp.com/advisory/ntap-20200103-0002/
ADVISORYhttps://www.debian.org/security/2020/dsa-4626
ADVISORYhttps://www.tenable.com/security/tns-2021-14
ADVISORYhttps://seclists.org/bugtraq/2020/Feb/27
ADVISORYhttps://security.netapp.com/advisory/ntap-20200103-0002/
ADVISORYhttps://www.debian.org/security/2020/dsa-4626
ADVISORYhttps://www.tenable.com/security/tns-2021-14

All References (14)

→
https://bugs.php.net/bug.php?id=78943Mailing List · Patch · Vendor Advisory
→
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/27Mailing List · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20200103-0002/Third Party Advisory
→
https://www.debian.org/security/2020/dsa-4626Third Party Advisory
→
https://www.tenable.com/security/tns-2021-14Third Party Advisory
→
https://bugs.php.net/bug.php?id=78943Mailing List · Patch · Vendor Advisory
→
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/27Mailing List · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20200103-0002/Third Party Advisory
→
https://www.debian.org/security/2020/dsa-4626Third Party Advisory
→
https://www.tenable.com/security/tns-2021-14Third Party Advisory

Quick Facts

CVE IDCVE-2019-11049
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-415
CISA KEVNo
Affected5 vendor(s)
PublishedDec 23, 2019

Related CVEs (CWE-415)

CVE-2018-0101
10.0
CVE-2016-5768
9.8
CVE-2018-12782
9.8
CVE-2017-14952
9.8
CVE-2016-3132
9.8
CVE-2018-17825
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-11049 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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