---
title: "Critical React RCE Vulnerability Exploited in the Wild—Patch Now"
short_title: "Critical React RCE flaw actively exploited"
description: "CISA adds CVE-2025-55182, a critical React Server Components RCE vulnerability, to its KEV Catalog. Learn mitigation steps and protect your systems."
author: "Vitus"
date: 2025-01-24
categories: [Cybersecurity, Vulnerabilities]
tags: [cve-2025-55182, react, rce, cisa, known-exploited-vulnerabilities]
score: 0.92
cve_ids: [CVE-2025-55182]
---
TL;DR
CISA has added CVE-2025-55182, a critical Remote Code Execution (RCE) vulnerability in Meta’s React Server Components, to its Known Exploited Vulnerabilities (KEV) Catalog due to evidence of active exploitation. Federal agencies must patch immediately, while all organizations are urged to prioritize remediation to mitigate risks of cyberattacks.
---
Main Content
The Cybersecurity and Infrastructure Security Agency (CISA) has escalated its response to a critical security flaw in Meta’s React Server Components, designating it as an actively exploited threat. The vulnerability, tracked as CVE-2025-55182, allows attackers to execute arbitrary code remotely, posing severe risks to organizations worldwide. This addition to CISA’s Known Exploited Vulnerabilities (KEV) Catalog underscores the urgency of applying mitigations and patches to prevent potential breaches.
Key Points
- CVE-2025-55182 is a Remote Code Execution (RCE) vulnerability in React Server Components, enabling attackers to take control of affected systems.
- CISA has confirmed active exploitation of this flaw, adding it to the KEV Catalog to mandate federal agency action.
- Binding Operational Directive (BOD) 22-01 requires Federal Civilian Executive Branch (FCEB) agencies to remediate the vulnerability by the specified due date.
- While BOD 22-01 applies only to federal agencies, CISA strongly recommends all organizations prioritize patching to reduce exposure to cyberattacks.
Technical Details
CVE-2025-55182 affects React Server Components, a popular framework for building dynamic web applications. The vulnerability stems from improper input validation, allowing attackers to craft malicious requests that execute arbitrary code on the server. This flaw is particularly dangerous because it can be exploited remotely without authentication, making it a prime target for cybercriminals.
For more technical insights, refer to the [React Blog: Critical Security Vulnerability in React Server Components](https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components).
Impact Assessment
The exploitation of CVE-2025-55182 can lead to:
- Unauthorized remote code execution, granting attackers full control over affected systems.
- Data breaches, as compromised servers may expose sensitive information.
- Lateral movement within networks, enabling attackers to escalate privileges and target additional systems.
- Disruption of services, particularly for organizations relying on React-based applications for critical operations.
Given the widespread use of React, this vulnerability could impact thousands of applications, including those in finance, healthcare, and government sectors.
Affected Systems
- React Server Components deployed in internet-accessible environments.
- Applications using unpatched versions of React Server Components.
- Systems where mitigations have not been applied as outlined in the [React security advisory](https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components).
Mitigation Steps
1. Apply Patches Immediately: Update all affected React Server Components to the latest secure version.
2. Check for Compromise: Review logs and monitor for signs of unauthorized access or exploitation, particularly in internet-facing instances.
3. Isolate Critical Systems: Temporarily restrict access to vulnerable systems until patches are applied.
4. Follow CISA Guidelines: Adhere to the remediation timelines and best practices outlined in [BOD 22-01](https://www.cisa.gov/binding-operational-directive-22-01).
5. Enhance Monitoring: Deploy intrusion detection systems (IDS) and endpoint protection to detect and block exploitation attempts.
Conclusion
The addition of CVE-2025-55182 to CISA’s KEV Catalog highlights the critical nature of this vulnerability and the immediate threat it poses to organizations. While federal agencies are required to act, all businesses and developers using React Server Components must prioritize patching to safeguard their systems. Proactive measures, such as monitoring for signs of compromise and applying mitigations, are essential to reducing the risk of exploitation.
Stay vigilant, patch promptly, and follow CISA’s guidelines to protect your infrastructure from this and future threats.
---
References
[^1]: CISA. "[CISA Adds One Known Exploited Vulnerability to Catalog](https://www.cisa.gov/news-events/alerts/2025/12/05/cisa-adds-one-known-exploited-vulnerability-catalog)". Retrieved 2025-01-24.
[^2]: React Blog. "[Critical Security Vulnerability in React Server Components](https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components)". Retrieved 2025-01-24.
[^3]: CVE Details. "[CVE-2025-55182](https://www.cve.org/CVERecord?id=CVE-2025-55182)". Retrieved 2025-01-24.