CVE-2023-21818: Windows Secure Channel Denial of Service Vulnerability
Modified
Published 14-02-2023Last modified 19-08-2026
Vulnerability summary
CVE-2023-21818 is a high (CVSS 7.5) Improper Input Validation vulnerability in microsoft windows_10. EPSS estimates a 43.17% chance of exploitation in the next 30 days, higher than 98.7% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (CVE.org)EPSS score
43.17%
0%100%
High · 0.00 pp in 30 daysKEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded
Timeline
- 14-02-2023PublishedVulnerability first disclosed.
- 19-08-2026Last modifiedVulnerability information updated.
Description
Windows Secure Channel Denial of Service Vulnerability
CVSS metrics
2 scores · 2 sources · 1 versionHigh 7.5Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:CSourcesAll 2 agree
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
43.17%
Chance of exploitation in the next 30 days
Percentile
99%
Versus all other CVEs
30-day change
No change 0.00 pp
From 43.17% 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 causeAffected systems
Microsoft29 products
- windows_10< 10.0.10240.19747
- windows_10_1607< 10.0.14393.5717
- windows_10_1809< 10.0.17763.4010
- windows_10_20h2< 10.0.19042.2604
- windows_10_21h2< 10.0.19044.2604
1 vendor · 29 products
