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cve recordhighexploited in the wildzero day3 of 3 cataloguesransomwareexploit reported

CVE-2025-55182

Meta · React Server Components · Meta React Server Components Remote Code Execution Vulnerability

· Added to CISA KEV
CVSS—
Severityhigh
Weakness—
EPSS99.8%100.0th percentile
Exploited3 KEV sources
Ransomware useKnown
Federal fix dueDec 12, 2025
patch window

Called exploited the same day it was disclosed.

Measured from the CVE publication date to the earliest of 3 KEV catalogues that list it.

The life of this vulnerability

  1. CVE published
  2. First KEV listingsame day
  3. Last KEV listing2d
  4. Last sighting9mo

Gaps are compressed to equal steps. The elapsed time is printed under each.

Which catalogues call it exploited

Sources3 of 3
Listings differ by2 d
Strongest claimconfirmed

3 catalogues list it. CIRCL aggregates the others and is shown but not counted.

Public exploitation evidence

674 public reports collected from VulnCheck and CIRCL, first on Dec 3, 2025. Each links to its original source. We have not verified them.

Description

Meta React Server Components contains a remote code execution vulnerability that could allow unauthenticated remote code execution by exploiting a flaw in how React decodes payloads sent to React Server Function endpoints. Please note CVE-2025-66478 has been rejected, but it is associated with CVE-2025- 55182.

Required action (CISA)

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

References

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Our coverage of CVE-2025-55182

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