Red Alert: “React2Shell” Threatens Web Applications
As reported by Hispasec based on the Cisco advisory, we are facing one of the most severe vulnerabilities of the year: CVE-2025-55182. With a CVSS score of 10.0, this flaw allows Remote Code Execution (RCE) without authentication on servers running modern React and Next.js components.
The situation is critical due to the widespread adoption of these frameworks. It is estimated that up to 40% of cloud environments could be affected. Advanced threat groups are already actively exploiting this flaw (known as “React2Shell”) to compromise infrastructures, leveraging insecure deserialization in the React Server Components Flight protocol.
Summary of Affected Technologies
| Product | Affected Versions | Risk |
|---|---|---|
| React Server Components | React 19 (react-server-dom-* packages) | Critical (Unauthenticated RCE) |
| Next.js | v15.x and v16.x (with App Router) | Critical (CVSS 10.0) |
| Other Frameworks | Redwood SDK, Waku, RSC plugins for Vite | Critical |
Agility and Visibility
These types of “Zero-Day” (or near-zero) vulnerabilities demonstrate why security cannot be a manual step at the end of development. At TeraLevel, we approach this crisis through automation and continuous monitoring. It is not enough to know a patch exists; you must have the capability to deploy it to production in minutes, not days.
The main challenge is not just updating the code, but quickly identifying which assets in your cloud infrastructure are publicly exposed and running the vulnerable versions of these frameworks.
How We Shield Your Environment Against React2Shell
TeraLevel helps mitigate the risk of CVE-2025-55182 through a comprehensive DevSecOps strategy:
- Automated Patch Deployment: Thanks to our optimized CI/CD pipelines, we can update React and Next.js dependencies and redeploy full applications massively and securely, ensuring the patch reaches production immediately.
- Perimeter Protection (WAF): While patches are being applied, we configure specific rules in your Web Application Firewalls (WAF) on AWS or Google Cloud to block malicious traffic patterns associated with this exploit.
- 24/7 Security Monitoring: Our proactive monitoring service detects anomalous command execution attempts on your servers, allowing us to react to an intrusion even if the patch has not yet been deployed.
Response speed is the difference between a scare and a data breach. Is your infrastructure prepared to react to a level 10 vulnerability?