Page generated: 11 Nov 2026, 12:51 UTC
CVE-2021-41379
Windows Installer Elevation of Privilege Vulnerability
CVSS 5.5 (MEDIUM) KEV: KNOWN CATALOG
Attention and evidence
HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
7.9/10
General review priority; not probability
Evidence confidence: Exploitation recorded
Sources: 9 documents and public datasets.
Hype components
Headline sample (25%)
0/100
Press, 30 days (60%)
0/100
Grounded branding (15%)
0/100
HYPE TOTAL0/100
Sources and documents
Rapid7
Press · 14 Feb 2022, 08:00 · Dropping Files on a Domain Controller Using CVE-2021-43893 - Rapid7
Krebs on Security
Press · 14 Dec 2021, 08:00 · Microsoft Patch Tuesday, December 2021 Edition - Krebs on Security
Cyberint
Press · 30 Nov 2021, 08:00 · Monthly Cyber Vulnerability Bulletin – November 2021 - Cyberint
Forbes
Press · 29 Nov 2021, 08:00 · Failed Microsoft Patch Leaves All Windows Versions Open To Zero-Day Hack - Forbes
SOC Prime
Press · 25 Nov 2021, 08:00 · Detecting Windows Installer Zero-Day (CVE-2021-41379) Exploits - SOC Prime
Score evolution
● Hype ● Reality
Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.
First record: hype 0.0 · reality 7.9 (2026-11-02 15:12). The curve appears once the score changes.
Public exploit evidence
0
Public exploit entries / repo candidates
Evidence context and dated references
Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.
Evidence in context
- Confidence in exploitation evidence
- Exploitation recorded
- Priority basis
- Recorded exploitation; CVSS 5.5; EPSS 19.5%
- Attention, last 30 days
- 0 distinct story titles; 0 press documents; 0 publisher domains.
- Technical potential
- local access, low privileges, no user interaction.
- Observed activity
- Exploitation recorded in CISA KEV.
- Known scale
- Not quantified.
- Evidence confidence basis
- Trusted exploitation confirmation
Score evaluated: 2026-11-05 13:58:31.036516+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z
Source event timeline
Published
10 Nov 2021, 00:46
First press mention
23 Nov 2021, 08:00
Latest press mention
14 Feb 2022, 08:00
Added to the CISA KEV catalog
03 Mar 2022, 00:00
Score calculated
05 Nov 2026, 13:58