CVE-2021-31205
Windows SMB Client Security Feature Bypass Vulnerability
Windows SMB Client Security Feature Bypass Vulnerability
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Windows SMB Client Security Feature Bypass Vulnerability
Windows SMB Client Security Feature Bypass Vulnerability
- Record
CVE-2021-31205- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C - Updated
- 2026-11-02
EUVDEUVD-2021-18118
Windows SMB Client Security Feature Bypass Vulnerability
- Record
EUVD-2021-18118- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-7h4c-m77c-qp3c
Windows SMB Client Security Feature Bypass Vulnerability
Windows SMB Client Security Feature Bypass Vulnerability
- Record
GHSA-7h4c-m77c-qp3c- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N - Updated
- 2026-11-02
NVD
Windows SMB Client Security Feature Bypass Vulnerability
- Record
CVE-2021-31205- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:P/I:N/A:N - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-31205 is a medium vulnerability (CVSS 6.5) in Microsoft Windows 10 Version 2004, published May 11, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.91%, the 87th percentile. No source names a fixed version.