# Microsoft Windows: SmartScreen Security Feature Bypass (CVE-2023-24880) · pwn.watch

> Microsoft Windows SmartScreen contains a security feature bypass vulnerability that could allow an attacker to evade Mark of the Web (MOTW) defenses via a specially crafted malicious file. Added to CISA KEV on 2023-03-14. CISA lists known use in ransomware campaigns.

Page: https://pwn.watch/i/microsoft-windows-cve-2023-24880 · generated 2026-10-23T01:56:39.502Z

## Status
- Severity: medium · status: closed · patch: patched
- Product: Microsoft Windows
- Started: 2023-03-14 · closed: 2023-03-14
- CVEs: CVE-2023-24880
- Affected: See vendor advisory / CISA notes (versions not always listed in KEV feed)
- Fixed in: See vendor advisory linked in sources

## Follow this incident
- RSS (one item per update): https://pwn.watch/i/microsoft-windows-cve-2023-24880/feed.xml
- JSON Feed: https://pwn.watch/i/microsoft-windows-cve-2023-24880/feed.json
- Full data (timeline, sources, posts, agentBrief): https://pwn.watch/i/microsoft-windows-cve-2023-24880.json
- This file: https://pwn.watch/i/microsoft-windows-cve-2023-24880/llms.txt

## Updates (newest first)
- 2023-03-14: CISA added CVE-2023-24880 to the KEV catalog (due 2023-04-04).

## Fix brief
# Security brief: Microsoft Windows: SmartScreen Security Feature Bypass (CVE-2023-24880)

Source: https://pwn.watch/i/microsoft-windows-cve-2023-24880 · status: closed (closed Mar 14, 2023) · severity: medium · updated Mar 14, 2023

## Patch status
**PATCHED: fixed releases exist. Upgrade to a fixed version.**

## What it is
Microsoft Windows SmartScreen contains a security feature bypass vulnerability that could allow an attacker to evade Mark of the Web (MOTW) defenses via a specially crafted malicious file. Added to CISA KEV on 2023-03-14. CISA lists known use in ransomware campaigns.

Severity detail: CVSS 4.4 (NVD), actively exploited (CISA KEV), known ransomware use

- Product: Microsoft Windows
- CVE / advisory ids: CVE-2023-24880

## Affected versions
- See vendor advisory / CISA notes (versions not always listed in KEV feed)

## Check whether you're affected
No generic command applies (the product is a hosted service, appliance or desktop app). Check the installed version in its admin UI / About screen and compare with the versions above.

## Fix
Upgrade to one of these fixed versions (or later on the same branch):
- See vendor advisory linked in sources

After upgrading, re-run the checks above and redeploy/restart the affected services.

## Latest updates
- Mar 14, 2023: CISA added CVE-2023-24880 to the KEV catalog (due 2023-04-04).

## Advisories
- [Vendor advisory: Microsoft Windows](https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-24880) (Microsoft)
- [NVD: CVE-2023-24880](https://nvd.nist.gov/vuln/detail/CVE-2023-24880) (NVD)
- [CISA Known Exploited Vulnerabilities Catalog](https://www.cisa.gov/known-exploited-vulnerabilities-catalog) (CISA)

## Caveats
Derived from CISA KEV JSON feed catalogVersion 2026.10.21. Exact affected/fixed version strings are not always in the KEV record — verify against the vendor advisory URL. startedAt uses dateAdded (exploitation may have begun earlier).

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Machine-readable: https://pwn.watch/i/microsoft-windows-cve-2023-24880.json · all incidents: https://pwn.watch/incidents.json. Verify against the vendor advisory before changing production systems.