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Page generated: 11 Nov 2026, 00:52 UTC
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CVE-2021-30807

A memory corruption issue was addressed with improved memory handling. This issue is fixed in macOS Big Sur 11.5.1, iOS 14.7.1 and iPadOS 14.7.1, watchOS 7.6.1. An application may be able to execute arbitrary code with kernel privileges. Apple is aware of a report that this issue…

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A memory corruption issue was addressed with improved memory handling. This issue is fixed in macOS Big Sur 11.5.1, iOS 14.7.1 and iPadOS 14.7.1, watchOS 7.6.1. An application may be able to execute arbitrary code with kernel privileges. Apple is aware of a report that this issue may have been actively exploited.
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: 28.84%: +0.14

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

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

The Hacker News
Press · 12 Oct 2021, 07:00 · Apple Releases Urgent iPhone and iPad Updates to Patch New Zero-Day Vulnerability - The Hacker News
The Record from Recorded Future News
Press · 10 Oct 2021, 07:00 · Apple patches iPhone zero-day in iOS 15.0.2 - The Record from Recorded Future News
Forbes
Press · 31 Jul 2021, 07:00 · New iPhone ‘Zero Day’ Hack Has Existed For Months - Forbes
Bitdefender
Press · 27 Jul 2021, 07:00 · Patch your iPhones and Macs against "actively exploited" zero-day right now - Bitdefender
Macworld
Press · 27 Jul 2021, 07:00 · Apple patches critical security flaw with macOS Big Sur 11.5.1 - Macworld
See all 9 source documents
Ars Technica
Press · 26 Jul 2021, 07:00 · iOS 14.7.1 and macOS 11.5.1 arrive with one bug fix and one security fix - Ars Technica
9to5Mac
Press · 26 Jul 2021, 07:00 · Apple releases macOS 11.5.1 with ‘important security updates’ - 9to5Mac
The Mac Observer
Press · 26 Jul 2021, 07:00 · Apple Releases Updates for Macs, iPhones, and iPads - The Mac Observer
OS X Daily
Press · 26 Jul 2021, 07:00 · MacOS Big Sur 11.5.1 Update Released with Security Fix - OS X Daily

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

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 28.8%
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 13:58:26.907878+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
First press mention
26 Jul 2021, 07:00
Latest press mention
12 Oct 2021, 07:00
Published
19 Oct 2021, 13:12
Added to the CISA KEV catalog
03 Nov 2021, 00:00
Score calculated
05 Nov 2026, 13:58
Source: CVE List V5 · CISA KEV · FIRST EPSS · GitHub · RSSVulnRadar