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CVE-2024-21412 KEVRansomwarePublic exploit High · 8.1 EPSS 99.4%
Microsoft Windows Internet Shortcut Files Security Feature Bypass Vulnerability
Microsoft · Windows
Summary
The flaw is a security feature bypass in the Internet Shortcut file handling component of Microsoft Windows. An attacker can exploit it over the network with no privileges required, but it needs a user to interact with a crafted shortcut file, and the result is a failure of a protection mechanism that can expose high confidentiality and integrity impact.
Official description · NVD
Internet Shortcut Files Security Feature Bypass Vulnerability
Priority scorePatchfirst’s 0 to 100 ranking. It adds points for CISA KEV listing, ransomware use, EPSS, threat reports, public exploit code and CVSS. Every CVE page shows the breakdown. Breakdown
82.5 / 100
- Exploited
- Yes, in CISA KEV
- Reports
- 1
- Tactics
- 2/15
How an attack unfolds
Based on MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. mappings. Select a step to see the evidence.How attackers get in
What they do
Exploitation timelineDated milestones for a CVE: when it was disclosed, when exploit code became public, when exploitation was confirmed, and when threat reports named it.
First seen exploited the day it was disclosed. Public exploit code (PoC-in-GitHub) appeared 37 days after disclosure.
- Named in a threat reportfortinet.com36 days before
- DisclosedFirst seen exploitedVulnCheck KEV evidenceAdded to CISA KEVknown ransomware use; EU database agreesday 0
- Public exploit codePoC-in-GitHub+37 days
CISA KEV listing is when exploitation was confirmed, not necessarily the first attack.
MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. techniques
2 TechniqueOne specific attacker behaviour in MITRE ATT&CK, such as T1190 “Exploit Public-Facing Application”. IDs with a dot, like T1059.004, are sub-techniques., grouped by TacticThe attacker’s goal at a stage of an attack in MITRE ATT&CK, such as Initial Access or Persistence. Each technique belongs to one or more tactics. in kill-chain order, 2 cited passages 2ExecutionTA0002
Malicious Link T1204.001 Medium Confidence (technique links)How sure Patchfirst is that an ATT&CK technique applies to this CVE. High and medium links are shown by default; low ones come from early or generic mappings, text matching, or contradict the CVE’s details.
AI mapping from the description · how it is exploited
User opens malicious shortcut file to trigger bypass
Internet Shortcut Files Security Feature Bypass Vulnerability
Defense Impairment
Mark-of-the-Web Bypass T1553.005 Medium Confidence (technique links)How sure Patchfirst is that an ATT&CK technique applies to this CVE. High and medium links are shown by default; low ones come from early or generic mappings, text matching, or contradict the CVE’s details.
AI mapping from the description · primary impact
Bypasses Mark-of-the-Web security feature protection
Internet Shortcut Files Security Feature Bypass Vulnerability
Detection
0 rules for this CVE · 10 general rules for its techniquesRules for this CVE
0Sigma ruleAn open, vendor-neutral detection rule for log data. Security teams convert Sigma rules into searches for their own SIEM. that reference CVE-2024-21412 directly.CVE-specific rules are not available in this build. Search SigmaHQ ↗
General rules for this CVE’s techniques
These detect the technique in general, not this specific vulnerability.
Malicious LinkT1204.0014 general rules
- Symlink Etc Passwdhightest
- Potential ClickFix Execution Pattern - Registryhighexperimental
- Suspicious ClickFix/FileFix Execution Patternhighexperimental
- Suspicious Execution via macOS Script Editormediumtest
Mark-of-the-Web BypassT1553.0056 general rules
- Suspicious Invoke-Item From Mount-DiskImagemediumtest
- Suspicious Unblock-Filemediumtest
- Windows AppX Deployment Full Trust Package Installationmediumexperimental
- Windows AppX Deployment Unsigned Package Installationmediumexperimental
- Suspicious Mount-DiskImagelowtest
- Windows MSIX Package Support Framework AI_STUBS Executionlowexperimental
Sigma rules © SigmaHQ, Detection Rule License 1.1; linked, not reproduced.
What security researchers reported
Named in 1 threat report1 reportFortinetJan 2024
Reports are matched by finding the exact id CVE-2024-21412 in their text; nobody has reviewed the match. One passage is shown per report, at most 320 characters, linked to the original.
Also mentioned in 50 community threat pulses (AlienVault OTX)
Weaker evidencePulses are indicator collections that anyone can publish. A mention is not confirmation of exploitation.
- Actively_Exploited_Kev | Oct 30, 202629 Oct 2026
- Actively_Exploited_Kev | Oct 29, 202628 Oct 2026
- Actively_Exploited_Kev | Oct 28, 202627 Oct 2026
- Actively_Exploited_Kev | Oct 27, 202626 Oct 2026
- Actively_Exploited_Kev | Oct 24, 202623 Oct 2026
- Actively_Exploited_Kev | Oct 23, 202622 Oct 2026
- 44 more on OTX