Role: Windows Fax Service
CVE-2021-43234 — Windows Fax Service Remote Code Execution Vulnerability
Executive Summary
None
Overview
7.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
Required
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.8
EPSS Score
0.02064
probability of exploitation in the next 30 days
0.78891 percentile - updated 2026-06-21
View on FIRST.org
Affected Products
32 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 for 32-bit Systems | 5008230 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 for x64-based Systems | 5008230 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1607 for 32-bit Systems | 5008207 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1607 for x64-based Systems | 5008207 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 5008218 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1809 for ARM64-based Systems | 5008218 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1809 for x64-based Systems | 5008218 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1909 for 32-bit Systems | 5008206 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1909 for ARM64-based Systems | 5008206 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1909 for x64-based Systems | 5008206 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 2004 for 32-bit Systems | 5008212 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 2004 for ARM64-based Systems | 5008212 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 2004 for x64-based Systems | 5008212 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 20H2 for 32-bit Systems | 5008212 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 20H2 for ARM64-based Systems | 5008212 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 21H1 for 32-bit Systems | 5008212 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 21H1 for ARM64-based Systems | 5008212 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 21H1 for x64-based Systems | 5008212 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 21H2 for 32-bit Systems | 5008212 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 21H2 for ARM64-based Systems | 5008212 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 21H2 for x64-based Systems | 5008212 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 11 version 21H2 for ARM64-based Systems | 5008215 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 11 version 21H2 for x64-based Systems | 5008215 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 7 for 32-bit Systems Service Pack 1 5008244 (Monthly Rollup) 5008282 (Security Only) Important Remote Code Execution 5007236 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.1.7601.25796 Yes 5008244 5008282 Windows 7 for x64-based Systems Service Pack 1 5008244 (Monthly Rollup) 5008282 (Security Only) Important Remote Code Execution 5007236 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.1.7601.25796 Yes 5008244 5008282 Windows 8.1 for 32-bit systems 5008263 (Monthly Rollup) 5008285 (Security Only) Important Remote Code Execution 5007247 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.3.9600.20207 Yes 5008263 5008285 Windows 8.1 for x64-based systems 5008263 (Monthly Rollup) 5008285 (Security Only) Important Remote Code Execution 5007247 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.3.9600.20207 Yes 5008263 5008285 Windows RT 8.1 | 5008263 (Monthly Rollup) |
Important | Remote Code Execution | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 5008274 (Monthly Rollup) 5008271 (Security Only) Important Remote Code Execution 5007263 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.0.6003.21309 Yes 5008274 5008271 Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 5008274 (Monthly Rollup) 5008271 (Security Only) Important Remote Code Execution 5007263 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.0.6003.21309 Yes 5008274 5008271 Windows Server 2008 for x64-based Systems Service Pack 2 5008274 (Monthly Rollup) 5008271 (Security Only) Important Remote Code Execution 5007263 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.0.6003.21309 Yes 5008274 5008271 Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 5008274 (Monthly Rollup) 5008271 (Security Only) Important Remote Code Execution 5007263 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.0.6003.21309 Yes 5008274 5008271 Windows Server 2008 R2 for x64-based Systems Service Pack 1 5008244 (Monthly Rollup) 5008282 (Security Only) Important Remote Code Execution 5007236 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.1.7601.25796 Yes 5008244 5008282 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 5008244 (Monthly Rollup) 5008282 (Security Only) Important Remote Code Execution 5007236 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.1.7601.25796 Yes 5008244 5008282 Windows Server 2012 5008277 (Monthly Rollup) 5008255 (Security Only) Important Remote Code Execution 5007260 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.2.9200.23545 6.2.9200.23540 Yes 5008277 5008255 Windows Server 2012 (Server Core installation) 5008277 (Monthly Rollup) 5008255 (Security Only) Important Remote Code Execution 5007260 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.2.9200.23545 6.2.9200.23540 Yes 5008277 5008255 Windows Server 2012 R2 5008263 (Monthly Rollup) 5008285 (Security Only) Important Remote Code Execution 5007247 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.3.9600.20207 Yes 5008263 5008285 Windows Server 2012 R2 (Server Core installation) 5008263 (Monthly Rollup) 5008285 (Security Only) Important Remote Code Execution 5007247 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.3.9600.20207 Yes 5008263 5008285 Windows Server 2016 | 5008207 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2016 (Server Core installation) | 5008207 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2019 | 5008218 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2019 (Server Core installation) | 5008218 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2022 | 5008223 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2022 (Server Core installation) | 5008223 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server, version 2004 (Server Core installation) | 5008212 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server, version 20H2 (Server Core Installation) | 5008212 (Security Update) |
Important | Remote Code Execution | Yes |
Patches
8 patches
| Article | Type | Restart |
|---|---|---|
5008230 |
Security Update | Yes |
5008207 |
Security Update | Yes |
5008218 |
Security Update | Yes |
5008206 |
Security Update | Yes |
5008212 |
Security Update | Yes |
5008215 |
Security Update | Yes |
5008263 |
Monthly Rollup | Yes |
5008223 |
Security Update | 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
References
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