CVE-2023-21549: Windows SMB Witness Service Elevation of Privilege Vulnerability
Modified
Published 10-01-2023Last modified 01-01-2025
Vulnerability summary
CVE-2023-21549 is a high (CVSS 8.8) Improper Authorization vulnerability in microsoft windows_10_1607. EPSS estimates a 1.47% chance of exploitation in the next 30 days, higher than 73.5% of scored vulnerabilities.
CVSS score
8.8/10
010
High · v3.1 (CVE.org)EPSS score
1.47%
0%100%
Low · +0.04 pp in 30 daysKEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded
Timeline
- 10-01-2023PublishedVulnerability first disclosed.
- 01-01-2025Last modifiedVulnerability information updated.
Description
Windows SMB Witness Service Elevation of Privilege Vulnerability
CVSS metrics
2 scores · 2 sources · 1 versionHigh 8.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:CSourcesAll 2 agree
- NVDNIST8.8HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
1.47%
Chance of exploitation in the next 30 days
Percentile
74%
Versus all other CVEs
30-day change
Increase +0.04 pp
From 1.43% 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 cause- CWE-285Improper AuthorizationThe product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.
- CWE-269Improper Privilege ManagementThe product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.
Affected systems
Microsoft27 products
1 vendor · 27 products
References
1 links
msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21549Vendor Advisory