Role: DNS Server
CVE-2021-33745 — Windows DNS Server Denial of Service Vulnerability
Executive Summary
None
Overview
6.5
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
None
INTEGRITY
None
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 5.7
EPSS Score
No EPSS score available for this CVE.
View on FIRST.orgAffected Products
26 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows Server 2019 | 5004244 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server 2019 (Server Core installation) | 5004244 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server, version 2004 (Server Core installation) | 5004237 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server, version 20H2 (Server Core Installation) | 5004237 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server 2016 | 5004238 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server 2016 (Server Core installation) | 5004238 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 | 5004305 (Monthly Rollup) |
Important | Denial of Service | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) | 5004305 (Monthly Rollup) |
Important | Denial of Service | Yes |
| Windows Server 2008 for x64-based Systems Service Pack 2 | 5004305 (Monthly Rollup) |
Important | Denial of Service | Yes |
| Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | 5004305 (Monthly Rollup) |
Important | Denial of Service | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 | 5004299 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) | 5004299 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2008 for x64-based Systems Service Pack 2 | 5004299 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | 5004299 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2008 R2 for x64-based Systems Service Pack 1 | 5004289 (Monthly Rollup) |
Important | Denial of Service | Yes |
| Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | 5004289 (Monthly Rollup) |
Important | Denial of Service | Yes |
| Windows Server 2008 R2 for x64-based Systems Service Pack 1 | 5004307 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | 5004307 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2012 | 5004294 (Monthly Rollup) |
Important | Denial of Service | Yes |
| Windows Server 2012 (Server Core installation) | 5004294 (Monthly Rollup) |
Important | Denial of Service | Yes |
| Windows Server 2012 | 5004302 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2012 (Server Core installation) | 5004302 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2012 R2 | 5004298 (Monthly Rollup) |
Important | Denial of Service | Yes |
| Windows Server 2012 R2 (Server Core installation) | 5004298 (Monthly Rollup) |
Important | Denial of Service | Yes |
| Windows Server 2012 R2 | 5004285 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2012 R2 (Server Core installation) | 5004285 (Security Only) |
Important | Denial of Service | Yes |
Patches
11 patches
| Article | Type | Restart |
|---|---|---|
5004244 |
Security Update | Yes |
5004237 |
Security Update | Yes |
5004238 |
Security Update | Yes |
5004305 |
Monthly Rollup | Yes |
5004299 |
Security Only | Yes |
5004289 |
Monthly Rollup | Yes |
5004307 |
Security Only | Yes |
5004294 |
Monthly Rollup | Yes |
5004302 |
Security Only | Yes |
5004298 |
Monthly Rollup | Yes |
5004285 |
Security Only | Yes |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
Yuki Chen; Ting Yu from CERT Team of Legendsec at Qi'anxin Group; ZhiyiZhang from Codesafe Team of Legendsec at Qi'anxin Group
References
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