CVE-2021-1789

A type confusion issue was addressed with improved state handling. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, tvOS 14.4, watchOS 7.3, iOS 14.4 and iPadOS 14.4, Safari 14.0.3. Processing maliciously crafted web co…

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CVSS 8.8 (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 8.8: +1.32
Fresh EPSS: 13.98%: +0.07

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

Sources: 5 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

Bitsight

Press · 13 Jan 2023, 15:27 · 2023 Apple & iOS Vulnerabilities from CISA: Data - Bitsight

Malwarebytes

Press · 26 Jan 2022, 08:00 · New DazzleSpy malware attacks macOS - Malwarebytes

BleepingComputer

Press · 25 Jan 2022, 08:00 · New DazzleSpy malware targets macOS users in watering hole attack - BleepingComputer

Malwarebytes

Press · 16 Nov 2021, 08:00 · New Mac malware raises more questions about Apple’s security patching - Malwarebytes

blog.google

Press · 11 Nov 2021, 08:00 · Analyzing a watering hole campaign using macOS exploits - 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

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 8.8; EPSS 14.0%
Attention, last 30 days: 0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential: network 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 13:58:22.744333+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline

Published

02 Apr 2021, 18:01

First press mention

11 Nov 2021, 08:00

Added to the CISA KEV catalog

04 May 2022, 00:00

Latest press mention

13 Jan 2023, 15:27

Score calculated

05 Nov 2026, 13:58