CVE-2019-11043Underflow 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.

9.8 CRITICALEPSS 99.78%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Last updated: 2026-06-17 02:12 UTC

OverviewCVSS details

9.8CRITICALCVSS 3.1

Score source: NVD
NVD status: Analyzed
Published: Oct 28, 2019
Assigner: php

Affected

PHP (PHP)

Versions: 7.1.x before 7.1.33 · 7.2.x before 7.2.24
Fixed in: 7.1.33, 7.2.24, 7.3.11

All affected versions →

Exploitation

Public exploit: Yes · 3 references
CISA KEV: Listed · Mar 25, 2022
KEV due date: Apr 15, 2022
Ransomware use: Known
SSVC: Exploitation active · Automatable no · Impact total

EPSS · FIRST, scored Nov 7

99.78%chance of exploitation in 30 days

Higher than 99.95% of CVEs

CVSS 3.1 · NVD

9.8Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

CVSS 3.1 · php (CNA)

8.7High

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

Attack vector: Network
Attack complexity: High
Privileges required: None
User interaction: None
Scope: Changed
Confidentiality impact: High
Integrity impact: High
Availability impact: None

CVSS 2.0 · NVD

7.5High

AV:N/AC:L/Au:N/C:P/I:P/A:P

Attack vector: Network
Attack complexity: Low
Authentication: None
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
9.8	CRITICAL	3.1NVD	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.7	HIGH	3.1php (CNA)	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
7.5	HIGH	2.0NVD	AV:N/AC:L/Au:N/C:P/I:P/A:P

CISA required action

⚡ Known exploited · remediation due Apr 15, 2022

Apply updates per vendor instructions.

Details

CVE ID: CVE-2019-11043
Status: Analyzed
Assigner (CNA): php
Published: Oct 28, 2019
Last modified: 2026-06-17 02:12 UTC
Weaknesses: CWE-120 · Buffer Overflow
CWE-787

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 13:07 UTC.