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CVE-2019-11043Underflow in PHP-FPM can lead to RCE

Description

In PHP versions 7.1.x below 7.1.33, 7.2.x below 7.2.24 and 7.3.x below 7.3.11 in certain configurations of FPM setup it is possible to cause FPM module to write past allocated buffers into the space reserved for FCGI protocol data, thus opening the possibility of remote code execution.

Exploited in the wild

CISA lists this vulnerability in its Known Exploited Vulnerabilities catalog as PHP FastCGI Process Manager (FPM) Buffer Overflow Vulnerability.

Added
25 Mar 2022
Fix due (US federal)
15 Apr 2022
Used by ransomware
Known

Apply updates per vendor instructions.

ENISA's EU Vulnerability Database lists it as exploited, from CISA's KEV, since 25 Mar 2022.

Public exploit

An exploit or proof of concept is public: anyone can try it against an unpatched system. The public collections list a Metasploit module, a Nuclei template and 2 Exploit-DB entries for it. CISA's SSVC rates its exploitation: it is being exploited.

Show the exploits4

Metasploit modules1 module

Nuclei templates1 template

Exploit-DB2 entries

Modules, templates and exploits as listed by the Metasploit Framework (BSD-3-Clause), ProjectDiscovery's Nuclei templates (MIT) and the Exploit Database (GPLv2), read once a day. Where the data comes from

Timeline

  1. ID reserved

    By php

  2. · 7 months later

    Published

  3. · 2 years later

    Added to CISA KEV

    Known exploited, also by ransomware

  4. · 4 years later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2019-11043, by who scored it
Scored byCVSSScoreVector
phpCNA (assigner)3.1High8.7CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
NVDNVD · Analyzed3.1Critical9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
99.8% · top 0.1% of all CVEs (15 Nov 2026)
CISA SSVC
Exploitation: active · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.7.

Affected products

  • PHP · PHP

    • affected 7.1.x – < 7.1.33
    • affected 7.2.x – < 7.2.24
    • affected 7.3.x – < 7.3.11

What to do

Workaround: Configuring nginx (or other server that implements the front-end part of the FPM protocol) to check for the existence of the target file before passing it to PHP FPM (e.g. "try_files $uri =404" or "if (-f $uri)" in nginx) for would prevent this vulnerability from happening.

Exploitation: Exploit described at https://github.com/neex/phuip-fpizdam

References

References28

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .