CVE-2021-40456: microsoft windows_server Incorrect Authorization
CVSS: 5.3v3.1MediumModified
Published 13-10-2021Last modified 04-08-2024
Vulnerability summary
CVE-2021-40456 is a medium (CVSS 5.3) Incorrect Authorization vulnerability in microsoft windows_server. EPSS estimates a 2.34% chance of exploitation in the next 30 days, higher than 83.3% of scored vulnerabilities.
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)EPSS score
2.34%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 13-10-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
Windows AD FS Security Feature Bypass Vulnerability
CVSS metrics
3 scores · 2 sources · 2 versionsMedium 5.3Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:CSourcesAll 2 agree
- NVDNIST5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:N/A:NSourcesSingle source
EPSS trend
Probability
2.34%
Chance of exploitation in the next 30 days
Percentile
83%
Versus all other CVEs
30-day change
0.00 pp
From 2.34% on 19-09-2026
19-09-202619-10-2026
EPSS score2.34%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Microsoft6 products
- windows_server20h2
- windows_server_2019≥ 10.0.0, < 10.0.17763.2237 | na
- windows server 2019 (server core installation)≥ 10.0.0, < 10.0.17763.2237
- windows_server_2022≥ 10.0.0, < 10.0.20348.288
- windows server version 2004≥ 10.0.0, < 10.0.19041.1288
1 vendor · 6 products
References
1 links
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40456X Refsource MISCPatchVendor Advisory