CVE-2021-34451 Microsoft Office Online Server Spoofing Vulnerability
Medium 5.3
Published
Updated
Check this codebase for CVE-2021-34451 and fix it if it is affected.
What it is: CVE-2021-34451 is a medium-severity vulnerability in Microsoft Office Online Server, published on 16 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-34451 in the wild and no public exploit code.
Affected product: Microsoft Office Online Server. 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-2021-34451/ (Markdown: https://insights.sbomify.com/CVE-2021-34451/index.md)
Attackers can spoof content in Microsoft Office Online Server, potentially misleading users about the source or integrity of documents.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-34451?
CVE-2021-34451 is a medium-severity vulnerability in Microsoft Office Online Server, published on 16 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Microsoft Office Online Server Spoofing Vulnerability
Which versions are affected by CVE-2021-34451?
It affects 1 product.
Products include Microsoft Office Online Server.
How do I fix CVE-2021-34451?
No fix has been published for CVE-2021-34451 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-34451 being exploited?
There is no known exploitation of CVE-2021-34451 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Office Online Server
- CVE-2022-33648 Microsoft Excel Remote Code Execution Vulnerability
- CVE-2017-8743 Memory corruption in Microsoft Office
- CVE-2023-23396 Microsoft Excel Denial of Service Vulnerability
- CVE-2020-1442 Cross-site scripting in Microsoft Office Online Server
- CVE-2022-30159 Microsoft Office Information Disclosure Vulnerability
Sources
Also known as GHSA-pvgh-q9cp-r848.