CVE-2019-11043: PHP FastCGI Process Manager (FPM) Buffer Overflow Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on , 879 days after the CVE record was published.
- How likely is exploitation in the next 30 days?
- 99.7%
EPSS score, percentile 100 of all scored records
- How severe?
- 8.7 High
CVSS v3.1 base score, given by the CNA
- What should I do?
CISA deadline . Apply updates per vendor instructions.
- Which versions are affected?
Affected
- from 7.1.x to before 7.1.33
- from 7.2.x to before 7.2.24
- from 7.3.x to before 7.3.11
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of ; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of ; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
What to do
Required action, set by CISA
Apply updates per vendor instructions.
CISA due date for this action: .
Workaround (from the CVE record)
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.
Advisories and patches
- USN-4166-1
- DSA-4552
- DSA-4553
- USN-4166-2
- FEDORA-2019-4adc49a476
- RHSA-2019:3286
- RHSA-2019:3287
- RHSA-2019:3299
- RHSA-2019:3300
- FEDORA-2019-187ae3128d
- FEDORA-2019-7bb07c3b02
- openSUSE-SU-2019:2441
Linked from CISA's catalog entry
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Affected | from 7.1.x to before 7.1.33 |
| Affected | from 7.2.x to before 7.2.24 |
| Affected | from 7.3.x to before 7.3.11 |
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
About this vulnerability
In some versions of PHP in certain configurations of FPM setup, it is possible to cause FPM module to write past allocated buffers allowing the possibility of remote code execution.
Summary: CISA's KEV catalog, as of .
- CISA added CVE-2019-11043 to its Known Exploited Vulnerabilities (KEV) catalog on 25 Mar 2022.
- CISA marks it as known to be used in ransomware campaigns.
- The due date CISA sets for the required action is 15 Apr 2022.
- The CVE record was published on 28 Oct 2019, 879 days before it was added to KEV.
- The CVE record carries a CVSS v3.1 base score of 8.7 (High), given by its CNA.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 99.7% (percentile 100), as of 28 Oct 2026.
- CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact total.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of ; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of ; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of . About the data.
Description
Underflow in PHP-FPM can lead to RCE
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.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
Weakness
- CWE-120: Buffer Overflow
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.
Timeline
| Date | Event |
|---|---|
| CVE record published | |
| Added to CISA KEV | |
| CISA due date for the required action | |
| CVE record last updated |
References
15 more in the CVE record.
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- CVE-2024-4577: PHP-CGI OS Command Injection Vulnerability
- CVE-2012-1823: PHP-CGI Query String Parameter Vulnerability