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Page generated: 10 Nov 2026, 17:46 UTC

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CVE-2021-42292

Microsoft Excel Security Feature Bypass 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

Why this priority?

Recorded exploitation baseline: +7.00
Technical severity: CVSS 7.8: +1.17
Fresh EPSS: 43.00%: +0.22

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 12 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

Microsoft

Press · 24 Mar 2023, 07:00 · Guidance for investigating attacks using CVE-2023-23397 - Microsoft

Arctic Wolf

Press · 22 Jul 2022, 17:43 · CVE-2021-42321 & CVE-2021-42292 - Arctic Wolf

Qualys

Press · 22 Feb 2022, 08:00 · Managing CISA Known Exploited Vulnerabilities with Qualys VMDR - Qualys

Cyberint

Press · 30 Nov 2021, 08:00 · Monthly Cyber Vulnerability Bulletin – November 2021 - Cyberint

Check Point Research

Press · 15 Nov 2021, 08:00 · 15th November – Threat Intelligence Report - Check Point Research

See all 12 source documents

Cyber Daily

Press · 12 Nov 2021, 08:00 · Alarm bells raised over loopholes in Palo Alto firewalls’ use of GlobalProtect VPN - Cyber Daily

TechTarget

Press · 10 Nov 2021, 08:00 · Exchange zero-day corrected on November Patch Tuesday - TechTarget

TechTarget

Press · 10 Nov 2021, 08:00 · Exchange zero-day corrected on November Patch Tuesday - TechTarget

BleepingComputer

Press · 10 Nov 2021, 08:00 · Microsoft patches Excel zero-day used in attacks, asks Mac users to wait - BleepingComputer

BleepingComputer

Press · 09 Nov 2021, 08:00 · Microsoft November 2021 Patch Tuesday fixes 6 zero-days, 55 flaws - BleepingComputer

Help Net Security

Press · 09 Nov 2021, 08:00 · Microsoft patches actively exploited Exchange, Excel zero-days (CVE-2021-42321, CVE-2021-42292) - Help Net Security

Krebs on Security

Press · 09 Nov 2021, 08:00 · Microsoft Patch Tuesday, November 2021 Edition - Krebs on Security

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

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 43.0%
Attention, last 30 days: 0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential: local access, no prior privileges, 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

First press mention

09 Nov 2021, 08:00

Published

10 Nov 2021, 00:47

Added to the CISA KEV catalog

17 Nov 2021, 00:00

Latest press mention

24 Mar 2023, 07:00

Score calculated

05 Nov 2026, 13:58