CVE-2025-21259 Microsoft Outlook Spoofing Vulnerability
Medium 5.3
Published
Updated
Check this codebase for CVE-2025-21259 and fix it if it is affected.
What it is: CVE-2025-21259 is a medium-severity vulnerability in Microsoft Outlook, published on 11 Feb 2025.
Exploitation: There is no known exploitation of CVE-2025-21259 in the wild and no public exploit code.
Affected product: Microsoft Outlook. 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-2025-21259/ (Markdown: https://insights.sbomify.com/CVE-2025-21259/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2025-21259?
CVE-2025-21259 is a medium-severity vulnerability in Microsoft Outlook, published on 11 Feb 2025.
Official description
Microsoft Outlook Spoofing Vulnerability
Weakness: CWE-451
Which versions are affected by CVE-2025-21259?
It affects 1 product.
Products include Microsoft Outlook.
How do I fix CVE-2025-21259?
No fix has been published for CVE-2025-21259 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-21259 being exploited?
There is no known exploitation of CVE-2025-21259 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Outlook
Sources
Also known as GHSA-47m6-2q4v-m2vx.