CVE-2021-24033Public exploitNetwork attack vector

Command execution via shell-interpolated port value

Published Mar 9, 2021 · Updated Aug 3, 2024

OS command injection in Meta Platforms, Inc. react-dev-utils before 11.0.4 allows remote attackers to execute commands via a crafted port value. getProcessForPort concatenates its port argument into an lsof command string passed to child_process.execSync, allowing shell metacharacters to alter the command. Exposure requires custom code to call the utility with user-controlled input; standard react-scripts usage does not expose the flaw.

CVSS severity5.6
Medium
EPSS probability3.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

OS command injection in Meta Platforms, Inc. react-dev-utils before 11.0.4 allows remote attackers to execute commands via a crafted port value. getProcessForPort concatenates its port argument into an lsof command string passed to child_process.execSync, allowing shell metacharacters to alter the command. Exposure requires custom code to call the utility with user-controlled input; standard react-scripts usage does not expose the flaw.

The record

CVE
CVE-2021-24033
Published
Mar 9, 2021
Updated
Aug 3, 2024
Vendor
Meta Platforms, Inc.
Product
react-dev-utils
Classifications
CWE-78, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 9, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <11.0.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Meta Platforms, Inc. · react-dev-utilsversion=unspecified <11.0.4

Published CVSS scores

5.6GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo