Page generated: 10 Nov 2026, 17:54 UTC
CVE-2021-1647
Microsoft Defender Remote Code Execution Vulnerability
CVSS 7.8 (HIGH) KEV: KNOWN CATALOG
Attention and evidence
HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
8.4/10
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
Qualys
Press · 22 Feb 2022, 08:00 · Managing CISA Known Exploited Vulnerabilities with Qualys VMDR - Qualys
wiz.io
Press · 03 Feb 2022, 08:00 · 5 reasons endpoint security agents are not enough - wiz.io
Securelist
Press · 31 May 2021, 07:00 · IT threat evolution Q1 2021. Non-mobile statistics - Securelist
BleepingComputer
Press · 11 Feb 2021, 08:00 · 12-year-old Windows Defender bug gives hackers admin rights - BleepingComputer
blog.google
Press · 25 Jan 2021, 08:00 · New campaign targeting security researchers - blog.google
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 8.4 (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 7.8; EPSS 39.7%
- 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 13:58:22.744333+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z
Source event timeline
First press mention
12 Jan 2021, 08:00
Published
12 Jan 2021, 19:42
Added to the CISA KEV catalog
03 Nov 2021, 00:00
Latest press mention
22 Feb 2022, 08:00
Score calculated
05 Nov 2026, 13:58