OnlyFm252
Windows Network File System

CVE-2021-31974 — Server for NFS Denial of Service Vulnerability

Important CVSS 7.5 EPSS 0.06733 2021-07 archive

Executive Summary

None

Overview

7.5
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Denial of Service
Released Jul 13 2021
Last Updated Jul 13 2021
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.06733 — 0.93111 percentile
NVD CVSS 7.5 HIGH — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
None
INTEGRITY
None
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.5

EPSS Score

0.06733
probability of exploitation in the next 30 days
0.93111 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

25 affected products
Product KB Article Severity Impact Restart Required
Windows 10 for 32-bit Systems 5003687 (Security Update) Important Denial of Service Yes
Windows 10 for x64-based Systems 5003687 (Security Update) Important Denial of Service Yes
Windows 10 Version 1607 for 32-bit Systems 5003638 (Security Update) Important Denial of Service Yes
Windows 10 Version 1607 for x64-based Systems 5003638 (Security Update) Important Denial of Service Yes
Windows 10 Version 1809 for 32-bit Systems 5003646 (Security Update) Important Denial of Service Yes
Windows 10 Version 1809 for ARM64-based Systems 5003646 (Security Update) Important Denial of Service Yes
Windows 10 Version 1809 for x64-based Systems 5003646 (Security Update) Important Denial of Service Yes
Windows 10 Version 1909 for 32-bit Systems 5003635 (Security Update) Important Denial of Service Yes
Windows 10 Version 1909 for ARM64-based Systems 5003635 (Security Update) Important Denial of Service Yes
Windows 10 Version 1909 for x64-based Systems 5003635 (Security Update) Important Denial of Service Yes
Windows 10 Version 2004 for 32-bit Systems 5003637 (Security Update) Important Denial of Service Yes
Windows 10 Version 2004 for ARM64-based Systems 5003637 (Security Update) Important Denial of Service Yes
Windows 10 Version 2004 for x64-based Systems 5003637 (Security Update) Important Denial of Service Yes
Windows 10 Version 20H2 for 32-bit Systems 5003637 (Security Update) Important Denial of Service Yes
Windows 10 Version 20H2 for ARM64-based Systems 5003637 (Security Update) Important Denial of Service Yes
Windows 10 Version 21H1 for 32-bit Systems 5003637 (Security Update) Important Denial of Service Yes
Windows 10 Version 21H1 for ARM64-based Systems 5003637 (Security Update) Important Denial of Service Yes
Windows 10 Version 21H1 for x64-based Systems 5003637 (Security Update) Important Denial of Service Yes
Windows 8.1 for 32-bit systems 5003671 (Monthly Rollup) 5003681 (Security Only) Important Denial of Service 5003209 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C 6.3.9600.20045 6.3.9600.20044 Yes 5003671 5003681 Windows 8.1 for x64-based systems 5003671 (Monthly Rollup) 5003681 (Security Only) Important Denial of Service 5003209 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C 6.3.9600.20045 6.3.9600.20044 Yes 5003671 5003681 Windows RT 8.1 5003671 (Monthly Rollup) Important Denial of Service Yes
Windows Server 2012 5003697 (Monthly Rollup) 5003696 (Security Only) Important Denial of Service 5003208 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C 6.2.9200.23372 Yes 5003697 5003696 Windows Server 2012 (Server Core installation) 5003697 (Monthly Rollup) 5003696 (Security Only) Important Denial of Service 5003208 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C 6.2.9200.23372 Yes 5003697 5003696 Windows Server 2012 R2 5003671 (Monthly Rollup) 5003681 (Security Only) Important Denial of Service 5003209 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C 6.3.9600.20045 6.3.9600.20044 Yes 5003671 5003681 Windows Server 2012 R2 (Server Core installation) 5003671 (Monthly Rollup) 5003681 (Security Only) Important Denial of Service 5003209 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C 6.3.9600.20045 6.3.9600.20044 Yes 5003671 5003681 Windows Server 2016 5003638 (Security Update) Important Denial of Service Yes
Windows Server 2016 (Server Core installation) 5003638 (Security Update) Important Denial of Service Yes
Windows Server 2019 5003646 (Security Update) Important Denial of Service Yes
Windows Server 2019 (Server Core installation) 5003646 (Security Update) Important Denial of Service Yes
Windows Server, version 2004 (Server Core installation) 5003637 (Security Update) Important Denial of Service Yes
Windows Server, version 20H2 (Server Core Installation) 5003637 (Security Update) Important Denial of Service Yes

Patches

6 patches
Article Type Restart
5003687 Security Update Yes
5003638 Security Update Yes
5003646 Security Update Yes
5003635 Security Update Yes
5003637 Security Update Yes
5003671 Monthly Rollup Yes

Known Exploits

Acknowledgments

None

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