CVE-2025-67779

React vulnerability

CVSS

7.5

EPSS

19.2%

EPSS pct

97th

Exploited

No known

It was found that the fix addressing CVE-2025-55184 in React Server Components was incomplete and does not prevent a denial of service attack in a specific case. React Server Components versions 19.0.2, 19.1.3 and 19.2.2 are affected, allowing unsafe deserialization of payloads from HTTP requests to Server Function endpoints. This can cause an infinite loop that hangs the server process and may prevent future HTTP requests from being served.

Affected vendor

Facebook

Affected product

React

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness type (CWE)

CWE-502 — Deserialization of Untrusted Data
CWE-400 — Uncontrolled Resource Consumption

Published

2025-12-12

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to availability.

Its EPSS score of 19.2% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 97% of all scored CVEs.

Check your external exposure to CVE-2025-67779

Confirm whether Facebook React is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2025-67779.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2025-67779

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2025-67779 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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