CVE-2021-31205 Windows SMB Client Security Feature Bypass Vulnerability
Medium 6.5
Published
Updated
Check this codebase for CVE-2021-31205 and fix it if it is affected.
What it is: CVE-2021-31205 is a medium-severity vulnerability in Microsoft Windows 10, published on 11 May 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-31205 in the wild and no public exploit code.
Affected product: Microsoft Windows 10. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2021-31205/ (Markdown: https://insights.sbomify.com/CVE-2021-31205/index.md)
An attacker can bypass security features in the Windows SMB Client, potentially undermining client-side protections.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-31205?
CVE-2021-31205 is a medium-severity vulnerability in Microsoft Windows 10, published on 11 May 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Windows SMB Client Security Feature Bypass Vulnerability
Which versions are affected by CVE-2021-31205?
It affects 2 products.
Products include Microsoft Windows 10, Microsoft Windows Server 2016.
How do I fix CVE-2021-31205?
No fix has been published for CVE-2021-31205 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-31205 being exploited?
There is no known exploitation of CVE-2021-31205 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 10
- CVE-2015-2426 Microsoft Windows Adobe Type Manager Library Remote Code Execution
- CVE-2015-1769 Microsoft Windows Mount Manager Privilege Escalation
- CVE-2020-1467 Windows Hard Link Elevation of Privilege Vulnerability
- CVE-2021-26424 Windows TCP/IP Remote Code Execution Vulnerability
- CVE-2021-28476 Windows Hyper-V Remote Code Execution Vulnerability
Sources
Also known as GHSA-7h4c-m77c-qp3c.