CVE-2019-11043VulnerabilityPublished 03/25/2022Updated 10/24/2026

CVE-2019-11043: PHP FastCGI Process Manager (FPM) Buffer Overflow Vulnerability

Affects PHP FastCGI Process Manager (FPM)Source CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 03/25/2022
KEV deadline: 04/15/2022
Ransomware: Used in ransomware campaigns
EPSS: 99.7% chance of exploitation in 30 days – higher than 99% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2019-11043 (opens in a new tab)

Description

CVE-2019-11043 is a high severity buffer overflow vulnerability in certain configurations of PHP FastCGI Process Manager (FPM). It allows remote attackers to cause the FPM module to write beyond allocated buffers, potentially leading to remote code execution. This vulnerability has been exploited in the wild and is associated with known ransomware campaigns.

Summary

CVE-2019-11043 affects some versions of PHP when configured with FastCGI Process Manager (FPM). The vulnerability arises from a buffer overflow condition that allows the FPM module to write past allocated memory buffers. This flaw can be exploited remotely to execute arbitrary code on the affected system. The vulnerability is identified as CWE-120 (Classic Buffer Overflow). It has been observed in active exploitation scenarios, including ransomware campaigns.

Impact

Successful exploitation of this vulnerability can lead to remote code execution on affected systems running vulnerable PHP FPM configurations. This can result in full system compromise, data loss, or deployment of ransomware. The vulnerability has been exploited in the wild, confirming its practical impact.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is confirmed, users should review PHP FPM configurations and consider applying any available vendor updates or workarounds. Monitoring vendor channels for patches is strongly recommended.

Weaknesses

CWE-120Buffer Copy without Size Check (opens in a new tab)

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 10:57:28 UTC

Weaknesses

References

Related threats