# CVE-2023-24880 — Microsoft Windows 10 Version 1809 **CISA KEV** · **Ransomware** > As of 2025-10-21, CVE-2023-24880 is a MEDIUM-severity vulnerability in Microsoft Windows 10 Version 1809, CVSS v3.1 4.4, EPSS 78.0% (99.5th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-03-14), with a US federal remediation deadline of 2023-04-04, and CISA links it to known ransomware campaigns. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2023-24880, most recently “Magniber Ransomware: Rewritten 2022 Variant Uses MSI Installer, AES-NI Encryption, and UAC Bypass”. **Last updated:** 2025-10-21 ## What is CVE-2023-24880? Windows SmartScreen Security Feature Bypass Vulnerability The record classifies CVE-2023-24880 under weakness class [CWE-863](https://intel.threadlinqs.com/cwe/CWE-863). Its CVSS v3 base vector states that the flaw requires local access to the host, needs no prior authentication, needs a user to take an action first. 12 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 1321 days ago. ## Severity and exploitation probability - **CVSS v3.1 base score:** 4.4 — MEDIUM (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L/E:F/RL:O/RC:C`) - **EPSS (FIRST):** 78.0% probability of exploitation in the next 30 days, higher than 99.5% of all scored CVEs - **CISA KEV:** Listed since 2023-03-14, federal remediation deadline 2023-04-04 — used in known ransomware campaigns - **Threadlinqs priority:** 10/10 — CISA lists it as used in ransomware, which Threadlinqs scores at the maximum - **Published:** 2023-03-14, last modified 2025-10-21 ## Is CVE-2023-24880 being exploited? CISA added CVE-2023-24880 to the Known Exploited Vulnerabilities catalog on 2023-03-14, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2023-04-04 under BOD 22-01. CISA flags the vulnerability as one used in known ransomware campaigns. Weaponised exploit code for CVE-2023-24880 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 48 in the Threadlinqs vulnerability feed. - [trickest/cve](https://github.com/trickest/cve/blob/main/2023/CVE-2023-24880.md) (trickest) ## Affected products and versions - [Microsoft](https://intel.threadlinqs.com/vendors/microsoft): Windows 10 Version 1809, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows 10 Version 20H2, Windows 11 version 21H2, Windows 10 Version 21H2, Windows 11 version 22H2, Windows 10 Version 22H2, Windows 10 Version 1607, Windows Server 2016, Windows Server 2016 (Server Core installation) ## How to fix CVE-2023-24880 Because CVE-2023-24880 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2023-04-04. No vendor patch reference has been recorded for CVE-2023-24880 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise. ## Threat activity tracking CVE-2023-24880 1 tracked threat in the Threadlinqs corpus references CVE-2023-24880, either in the campaign’s CVE list or as an indicator on the campaign record. - [Magniber Ransomware: Rewritten 2022 Variant Uses MSI Installer, AES-NI Encryption, and UAC Bypass](https://intel.threadlinqs.com/threat/TL-2026-2481) — HIGH · 2026-09-13 ## Sources Enriched from CVE.org, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-10-10. **Vendor advisory and patch** - [msrc.microsoft.com — vendor advisory](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-24880) Canonical: https://intel.threadlinqs.com/cve/CVE-2023-24880 Full detection coverage and IOCs for threats exploiting CVE-2023-24880 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp