Security Digest · Vulnerability record · Known exploited
CVE-2024-29988: Microsoft SmartScreen Prompt Security Feature Bypass Vulnerability
Exploited in the wild (CISA KEV). SmartScreen Prompt Security Feature Bypass Vulnerability
CISA KEV · added 2024-04-30 CVSS 8.8 High EPSS 45.2% · p99
Should you act?
Exploited: patch now if you run it
CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- Yes, if you run Microsoft SmartScreen Prompt. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-04-30, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-05-21; treat that as the outer limit, not the target.
- EPSS 45.2%, percentile 99: FIRST’s model estimates a 45.2% chance of exploitation activity in the next 30 days, higher than 99% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Needs a user to click or open something. Phishing makes that realistic, but it is not wormable.
What it is
SmartScreen Prompt Security Feature Bypass Vulnerability
CISA’s summary
Microsoft SmartScreen Prompt contains a security feature bypass vulnerability that allows an attacker to bypass the Mark of the Web (MotW) feature. This vulnerability can be chained with CVE-2023-38831 and CVE-2024-21412 to execute a malicious file.
Weakness type: CWE-693.
Product: Microsoft SmartScreen Prompt · Assigned by: microsoft · Published: 2024-04-09
Affected and fixed versions
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0 < 10.0.17763.5696 |
| Microsoft | Windows 10 Version 1809 | 10.0.0 < 10.0.17763.5696 |
| Microsoft | Windows Server 2019 | 10.0.17763.0 < 10.0.17763.5696 |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 < 10.0.17763.5696 |
| Microsoft | Windows Server 2022 | 10.0.20348.0 < 10.0.20348.2402 |
| Microsoft | Windows 11 version 21H2 | 10.0.0 < 10.0.22000.2899 |
| Microsoft | Windows 10 Version 21H2 | 10.0.19043.0 < 10.0.19044.4291 |
| Microsoft | Windows 11 version 22H2 | 10.0.22621.0 < 10.0.22621.3447 |
| Microsoft | Windows 10 Version 22H2 | 10.0.19045.0 < 10.0.19045.4291 |
| Microsoft | Windows 11 version 22H3 | 10.0.22631.0 < 10.0.22631.3447 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| microsoft | 3.1 | 8.8 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: none (no login)
- User interaction: required (a user must click/open something)
- Scope: unchanged
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: added 2024-04-30; federal due date 2024-05-21. Known ransomware use: Unknown.
- CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active, automatable no, technical impact total.
- FIRST EPSS (model of 2026-10-21): 45.15% probability of exploitation activity in the next 30 days; percentile 99.
Timeline
- — CVE record published by microsoft
- — Added to CISA’s Known Exploited Vulnerabilities catalog
- — CISA remediation deadline for US federal agencies
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vendor and project advisories, patches
- SmartScreen Prompt Security Feature Bypass Vulnerability msrc.microsoft.com
Vulnerability records
- CVE.org record CVE-2024-29988 cve.org
- NVD entry CVE-2024-29988 nvd.nist.gov
Government
All exploited Microsoft vulnerabilities · Today’s Security Digest