VulnerabilityModified
CVE-2025-53778
Improper authentication in Windows NTLM allows an authorized attacker to elevate privileges over a network.
HIGH 8.8EPSS 51.5%
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 51.5%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
Description
Improper authentication in Windows NTLM allows an authorized attacker to elevate privileges over a network.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 51.47% probability · 99th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-287
- Affected
- microsoft/windows 10 1507 · microsoft/windows 10 1607 · microsoft/windows 10 1809 · microsoft/windows 10 21h2 · microsoft/windows 10 22h2 · microsoft/windows 11 22h2 · microsoft/windows 11 23h2 · microsoft/windows 11 24h2 · microsoft/windows server 2008 · microsoft/windows server 2012 · microsoft/windows server 2016 · microsoft/windows server 2019 · microsoft/windows server 2022 · microsoft/windows server 2022 23h2 · microsoft/windows server 2025
- Source
- secure@microsoft.com
EPSS moved from 47.6% on 20 September 2026 to 51.5% on 1 November 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53778Vendor Advisory
- https://www.vicarius.io/vsociety/posts/cve-2025-53778-detection-script-improper-authentication-vulnerability-affecting-windows-ntlm
- https://www.vicarius.io/vsociety/posts/cve-2025-53778-mitigation-script-improper-authentication-vulnerability-affecting-windows-ntlm
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.