CVE-2025-55182

Exploitation

Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2025-12-05. Federal remediation due 2025-12-12.

SSVC decision

• ExploitationactiveCISA reports credible evidence of active exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

99.80% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 100.0% of scored records. A rank, not a probability.

NVD base score

10.0 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Analyzed. NVD last modified this record on 2026-08-04.

Red Hat severity

Critical. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2025-12-03 15:40Z9 MO AGO

Last updated

2026-08-04 03:56Z1 MO AGO

Reserved

2025-08-08

Assigning CNA

Meta

Record state

PUBLISHED

Severity

Critical (CVSS 10.0)

CNA CVSS vector

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

Weaknesses

• CWE-502Deserialization of Untrusted DataBase

Data version

5.2

Document digest

4515c343ceaaf646a16501ac0a9fac7b86c0617b93ab06b56af3138fd820b304

• www.facebook.comhttps://www.facebook.com/security/advisories/cve-2025-55182x_refsource_CONFIRM
• react.devhttps://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-componentsx_refsource_CONFIRM
• aws.amazon.comhttps://aws.amazon.com/blogs/security/china-nexus-cyber-threat-groups-rapidly-exploit-react2shell-vulnerability-cve-2025-55182/media-coverage
• www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-55182government-resource
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2025/12/03/4
• news.ycombinator.comhttps://news.ycombinator.com/item?id=46136026