CVE detail
CVE-2026-21511
Deserialization of untrusted data in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.
Buzz score
Why this CVE is surfacing
This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.
Buzz score components · mention 11.0 · diversity 10.0 · KEV 0.0 · OTX 0.0 · PoC 0.0
Why it matters now
Mention timeline
- Total mentions
- 0
- within the 30d window
- Peak daily
- 0
- highest bucket
Evidence
Source links by recency
2 source links · newest first
- The February 2026 Security Update ReviewZero Day Initiative
ake a closer look at some of the more interesting updates for this month, starting with the bugs under active attack: - CVE-2026-21510 - Windows Shell Security Feature Bypass Vulnerability This bug is listed as a security feature bypass, but it could also be classified as code execution. An attacker can bypass Windows SmartScreen and Windows Shell secu
vendorwww.thezdi.comFeb 10, 2026, 6:30 PM - https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21511msrc.microsoft.com
No excerpt available.
Vendor Advisorymsrc.microsoft.comFeb 10, 2026, 6:16 PM
Exploit code
Public exploit repository references
Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.
0 repository references · best confidence N/A · max 0 stars
Related records
Similar CVEs
6 related CVEs with shared weakness or product evidence
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Access of resource using incompatible type ('type confusion') in Microsoft Office Word allows an unauthorized attacker to execute code locally.
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Untrusted pointer dereference in Microsoft Office Word allows an unauthorized attacker to execute code locally.
- CVE-2025-62562CVSS 7.8 · High
Use after free in Microsoft Office Outlook allows an unauthorized attacker to execute code locally.
- CVE-2025-62559CVSS 7.8 · High
Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.
- CVE-2025-62558CVSS 7.8 · High
Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.
- CVE-2025-62555CVSS 7.0 · High
Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.