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CVE-2025-66478

Not in CISA KEVMetasploit moduleCVE-2025-66478

Not confirmed exploited. 1 of 8 rule sources name it.

Edge rules
1/8
Our test
No exploit yet
CVSS
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EPSS
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Posts, 14d
02026-10-21: 0 posts2026-10-22: 0 posts2026-10-23: 0 posts2026-10-24: 0 posts2026-10-25: 0 posts2026-10-26: 0 posts2026-10-27: 0 posts2026-10-28: 0 posts2026-10-29: 0 posts2026-10-30: 0 posts2026-10-31: 0 posts2026-11-01: 0 posts2026-11-02: 0 posts2026-11-03: 0 posts
Published
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Ask about CVE-2025-66478: who's covered, what to patch first, how vendors compare. I cite sources and won't help with attacks.

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Public exploits

1 found
1 Metasploit0 Exploit-DB0 Scanner template0 GitHub PoCs

Links are to third-party code: never run it outside an isolated lab.

Timeline

  1. 2025-12-03
    Metasploit module published
    Unauthenticated RCE in React Server Components (React2Shell)
  2. 2025-12-04
    F5 ships a rule
    React Server Components RCE

Social

2026-10-21: 0 posts2026-10-22: 0 posts2026-10-23: 0 posts2026-10-24: 0 posts2026-10-25: 0 posts2026-10-26: 0 posts2026-10-27: 0 posts2026-10-28: 0 posts2026-10-29: 0 posts2026-10-30: 0 posts2026-10-31: 0 posts2026-11-01: 0 posts2026-11-02: 0 posts2026-11-03: 0 posts

No posts seen yet on X, Bluesky, Mastodon, Hacker News or GitHub.

Vendor statements

Quoted
CloudflareWAF Managed RulesNo public claim

We found no public statement from this vendor naming this CVE. That is not proof of no protection: generic rules may still catch it. Each row gives the rule ID and its default action. The feed starts in January 2025, so older rules are missing.

AWSAWS WAF Managed RulesNo public claim

We found no public statement from this vendor naming this CVE. That is not proof of no protection: generic rules may still catch it. AWS often describes a vulnerability without naming its CVE (for example "Log4j"). We count only entries that name the CVE, so AWS coverage is understated.

Microsoft AzureFront Door and Application Gateway WAF (DRS)No public claim

We found no public statement from this vendor naming this CVE. That is not proof of no protection: generic rules may still catch it. The rule tables name CVEs but carry no dates, so Azure is left out of every time-to-rule figure.

Google CloudCloud Armor preconfigured WAF rulesNo public claim

We found no public statement from this vendor naming this CVE. That is not proof of no protection: generic rules may still catch it. Google names few CVEs: the release notes start in May 2024 and the rules reference lists CVEs without dates. Its cve-canary rules are opt-in.

FastlyNext-Gen WAF virtual patchesNo public claim

We found no public statement from this vendor naming this CVE. That is not proof of no protection: generic rules may still catch it. The feed holds only the latest 25 changes, so history builds up from the day we started reading it.

F5Attack signatures (Distributed Cloud WAF)3 quotesRule published

First dated 2025-12-04.

2025-12-04New rule200204048Source
Added: signature 200204048 "React Server Components RCE" (Server Side Code Injection, risk High), systems: Node.js, JavaScript, ReactJS. References: CVE-2025-55182, CVE-2025-66478.
2025-12-12Updated200204048Source
Updated: signature 200204048 "React Server Components RCE" (Server Side Code Injection, risk High), systems: Node.js, JavaScript, ReactJS. References: CVE-2025-55182, CVE-2025-66478.
2025-12-12Updated200204050Source
Updated: signature 200204050 "Next.js RSC Remote Code Execution" (Server Side Code Injection, risk High), systems: Node.js, JavaScript, ReactJS. References: CVE-2025-55182, CVE-2025-66478.
AkamaiApp & API Protector (Adaptive Security Engine)No public source

This vendor publishes no machine-readable rule changelog we can check.

OWASP CRSCore Rule Set (open source, used inside many WAFs)No public claim

We found no public statement from this vendor naming this CVE. That is not proof of no protection: generic rules may still catch it. CRS rarely names CVEs: it relies on generic detections. Our own lab measures what it actually blocks.