CVE-2025-55182CampaignPublished 5 Dec 2025Updated 4 Jan 2026

CVE-2025-55182: Meta React Server Components · China-nexus cyber threat groups rapidly exploit React2Shell vulnerability

Affects Meta React Server ComponentsSource AlienVault OTX General

Authoritative record:CVE-2025-55182· Critical 10.0

Exploited in the wild · used in ransomware campaigns · KEV due 12 Dec 2025 · public exploit available (Metasploit, Exploit-DB) · 99% EPSS : block it and hunt for it in your logs now.

Data as of 25 Oct 2026, 21:29 UTC

CVSS base score

10.0Critical

How severe the flaw is on the 0–10 CVSS scale.

KEV deadline: 12 Dec 2025 US federal agencies must patch by this date; a sensible deadline for everyone else.
Ransomware: Used in ransomware campaigns
EPSS: 99.8% chance of exploitation in 30 days – higher than 99% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

t = 0 is the CVE’s publication on cve.org

Disclosed: evidence found.
CVE published 3 Dec 2025
Detectable: evidence found.
nuclei template: React Server Components - Remote Code Execution
Weaponised: evidence found.
1 Metasploit module · 1 Exploit-DB entry, 127 days after disclosure
Exploited in the wildExploited: evidence found.
Listed in CISA KEV 2 days after disclosure
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

CVE ID reserved
by Meta
2025-08-0818:21Z, 117 days before disclosure
CVE published
on cve.org
2025-12-0315:40Z, t = 0
In Threat Radar
record ingested
2025-12-0315:54Z, 14 minutes after disclosure
Added to CISA KEV (opens in a new tab)
exploitation confirmed · ransomware use known
2025-12-05, 2 days after disclosure
KEV remediation due
US federal deadline
2025-12-12, 9 days after disclosure
First Exploit-DB entry (opens in a new tab)
React Server 19.2.0 - Remote Code Execution
2026-04-09, 127 days after disclosure

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CISA KEV (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade react to 20.0.0; next to 17.0.0 or 16.0.0.

Affected software

Product	Affected	Fixed in
npmreact`pkg:npm/react`Other threats	Affected <20.0.0 >=19.0.0	Fixed in 20.0.0
npmnext`pkg:npm/next`Other threats	Affected <16.0.0 >=15.0.0 <17.0.0 >=16.0.0	Fixed in 16.0.0 17.0.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

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

Description

CVE-2025-55182, known as React2Shell, is a critical vulnerability in React Server Components affecting React versions 19.x and Next.js versions 15.x and 16.x when using App Router. It has a maximum CVSS score of 10.0. Multiple China state-nexus threat groups, including Earth Lamia and Jackpot Panda, rapidly exploited this vulnerability within hours of its public disclosure on December 3, 2025. Public exploit code is available through Metasploit and Exploit-DB, and the vulnerability has been added to the CISA KEV catalog. Fixed versions include React 20.0.0 and Next.js 17.0.0 and later.

Impact

Successful exploitation allows attackers to compromise systems running vulnerable versions of React Server Components and Next.js, potentially leading to full system compromise. The rapid exploitation by state-sponsored groups and availability of public exploit code increases the risk of widespread attacks. The vulnerability is also known to be used in ransomware campaigns.

Defensive guidance

Fixed versions are available: React 20.0.0 and Next.js 17.0.0 and later. Users should upgrade to these versions immediately to mitigate the vulnerability. Since this is not a cloud service, remediation depends on applying these updates. Detection templates such as those from nuclei are available to identify exploitation attempts. Given the active exploitation and public exploit code, patching is urgent.

Public tooling indexed from Metasploit Framework, Exploit-DB and ProjectDiscovery nuclei-templates. Its existence raises the odds of exploitation; it does not confirm attacks.

Indicators of compromise

IP addresses 4

143.198.92.82
183.6.80.214
206.237.3.150
45.77.33.136

CVEs 2

CVE-2025-1338
CVE-2025-55182

Community reviews

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Exploitation evidence

Timeline

What to do

Affected software

Description

AI analysisMachine-generated, updated 25 Oct 2026, 21:29 UTC

Public exploits and detection1 Metasploit module, 1 Exploit-DB entry, a Nuclei detection template

MITRE ATT&CK techniques1 from threat tags

Technical details

Indicators of compromise

IP addresses 4

CVEs 2

Community reviews

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