Security-warning bypass via malformed Authenticode data
Published Mar 14, 2023 · Updated Oct 21, 2025
Security-feature bypass in Microsoft Windows SmartScreen allows attackers to suppress warnings for malicious downloaded files. SmartScreen processes a crafted MSI Authenticode certificate context, but a corrupted SPC_INDIRECT_DATA identifier leaves psIndirectData null; the resulting error makes the shell fail open. Exploitation requires a user to open the downloaded file, after which attacker-supplied code runs without the normal Mark-of-the-Web warning.
Summary
What happened
Security-feature bypass in Microsoft Windows SmartScreen allows attackers to suppress warnings for malicious downloaded files. SmartScreen processes a crafted MSI Authenticode certificate context, but a corrupted SPC_INDIRECT_DATA identifier leaves psIndirectData null; the resulting error makes the shell fail open. Exploitation requires a user to open the downloaded file, after which attacker-supplied code runs without the normal Mark-of-the-Web warning.
The record
- CVE
- CVE-2023-24880
- Published
- Mar 14, 2023
- Updated
- Oct 21, 2025
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-863, T1204.002
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 1, 2023Exploitation reportedMagniber ransomware delivery campaign
- Mar 14, 2023Exploitation reportedCISA Known Exploited Vulnerabilities catalog listing
- Mar 14, 2023CVE publishedPublication date reported by the CVE source.
- Oct 21, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.17763.0 <10.0.17763.4131
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Reported exploitation
- Magniber ransomware delivery campaignransomware
- CISA Known Exploited Vulnerabilities catalog listingknown exploited catalog
Technologies
Your stack
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Your stack
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