CVE-2020-27930

Read full description

A memory corruption issue was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 12.4.9, watchOS 6.2.9, Security Update 2020-006 High Sierra, Security Update 2020-006 Mojave, iOS 14.2 and iPadOS 14.2, watchOS 5.3.9, macOS Catalina 10.15.7 Supplemental Update, macOS Catalina 10.15.7 Update. Processing a maliciously crafted font may lead to arbitrary code execution.

CVSS 7.8 (HIGH) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE

0.0/10

REALITY · THREAT PRIORITY

8.3/10

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: 22.01%: +0.11

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

Sources: 3 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

BleepingComputer

Press · 20 Mar 2021, 07:00 · Hacking group used 11 zero-days to attack Windows, iOS, Android users - BleepingComputer

Macworld

Press · 09 Nov 2020, 08:00 · Apple closes zero-day attack hole on iPhones that was being exploited - Macworld

BleepingComputer

Press · 05 Nov 2020, 08:00 · Apple patches three actively exploited iOS zero-days - BleepingComputer

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 8.3 (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 22.0%
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 13:58:17.488851+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline

First press mention

05 Nov 2020, 08:00

Published

08 Dec 2020, 20:17

Latest press mention

20 Mar 2021, 07:00

Added to the CISA KEV catalog

03 Nov 2021, 00:00

Score calculated

05 Nov 2026, 13:58