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CVE-2024-21351 is a Windows SmartScreen security feature bypass vulnerability affecting Microsoft Windows. The flaw allows an attacker to circumvent SmartScreen protections when a user opens attacker-supplied content. Available reporting indicates the issue can permit code injection into SmartScreen, thereby bypassing trust and warning mechanisms intended to protect users from untrusted internet-originated files. Microsoft reported the vulnerability as exploited in the wild at the time of disclosure.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Security feature bypass vulnerability in Windows that Microsoft warned administrators about because it is being exploited in attacks.
A Windows vulnerability patched by Microsoft that the article states is actively weaponized in real-world attacks (no further technical details provided in the content).
A Windows SmartScreen security feature bypass that enables circumvention of SmartScreen protections, potentially leading to arbitrary code execution if a user is convinced to open a malicious file.
Windows SmartScreen / Mark-of-the-Web security feature bypass that could allow code injection into SmartScreen and potentially code execution and impact availability/data exposure.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.