Threat Intelligence / CVE / CVE-2021-42278
CVE-2021-42278
CISA KEVRansomwareAs of 2025-10-30, CVE-2021-42278 is a CVSS 7.5 (HIGH-severity) vulnerability. CISA KEV-listed (known exploited). EPSS exploitation probability 94.1%. Threadlinqs Intelligence tracks 1 threat exploiting it.
Last updated: 2025-10-30
Active Directory Domain Services Elevation of Privilege Vulnerability
CVSS v3 vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Weaknesses (CWE)
NVD-CWE-noinfo
Exploitation status
CISA KEV-listed (known exploited)
Threats tracking this CVE
- Black Basta Ransomware: Internal Chat Leaks Expose $100M+ RaaS Operation — Conti Successor Unmasked — HIGH
References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42278
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42278
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-42278
Full detection coverage & IOCs for threats exploiting CVE-2021-42278 are available via the Threadlinqs MCP server (Purple tier). View plans →
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Enriched from CVE.org, NVD (this product uses the NVD API but is not endorsed or certified by the NVD), FIRST EPSS, CISA KEV, and GitHub Security Advisories.