CVE-2021-33781: Azure AD Security Feature Bypass Vulnerability
Modified
Published 14-07-2021Last modified 10-08-2026
Vulnerability summary
CVE-2021-33781 is a high (CVSS 8.1) vulnerability in microsoft windows_10. EPSS estimates a 2.41% chance of exploitation in the next 30 days, higher than 83.9% of scored vulnerabilities.
CVSS score
8.1/10
010
High · v3.1 (CVE.org)EPSS score
2.41%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded
Timeline
- 14-07-2021PublishedVulnerability first disclosed.
- 10-08-2026Last modifiedVulnerability information updated.
Description
Azure AD Security Feature Bypass Vulnerability
CVSS metrics
3 scores · 2 sources · 2 versionsHigh 8.1Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:CSourcesAll 2 agree
- NVDNIST8.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Medium 5.5Preferred score · NVD (NIST)
AV:N/AC:L/Au:S/C:P/I:P/A:NSourcesSingle source
EPSS trend
Probability
2.41%
Chance of exploitation in the next 30 days
Percentile
84%
Versus all other CVEs
30-day change
No change 0.00 pp
From 2.41% on 22-09-2026
22-09-202622-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Microsoft14 products
- windows_10na | 20h2 | 21h1 | 1809 | 1909 | 2004
- windows 10 version 1607≥ 10.0.14393.0, < 10.0.14393.4704
- windows 10 version 1809≥ 10.0.17763.0, < 10.0.17763.2061 | ≥ 10.0.0, < 10.0.17763.2061
- windows 10 version 1909≥ 10.0.0, < 10.0.18363.1679
- windows 10 version 2004≥ 10.0.0, < 10.0.19041.1110
1 vendor · 14 products
References
2 links
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33781X Refsource MISCX TransferredPatchVendor Advisory