Home/CVE/An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 13.6 and iPadOS 13.
CVE

CVE-2020-9876

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 13.6 and iPadOS 13.

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 13.6 and iPadOS 13.6, macOS Catalina 10.15.6, tvOS 13.4.8, watchOS 6.2.8, iTunes 12.10.8 for Windows, iCloud for Windows 11.3, iCloud for Windows 7.20. Opening a maliciously crafted PDF file may lead to an unexpected application termination or arbitrary code execution.

HIGH · CVSS 7.8 EPSS 0.00741
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules8 YARA rules0
⬡

Weakness Classification

CWE-787Out-of-bounds Write
▤

Affected Products & Versions

12
apple icloud< 7.20
apple icloud>= 10.0 and < 11.5
apple itunes< 12.10.9
apple ipados< 14.0
apple iphone os< 14.0
apple mac os x>= 10.13 and < 10.13.6
apple mac os x>= 10.14 and < 10.14.6
apple mac os x>= 10.15 and < 10.15.6
◈

Sigma Hunt Rules

8
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighSuspicious Microsoft Office Child Process - MacOS
producthighRemote Access Tool - Renamed MeshAgent Execution - MacOS
producthighBinary Padding - MacOS
productmediumSuspicious Execution via macOS Script Editor
productmediumSystem Information Discovery Via Sysctl - MacOS
productmediumNew File Exclusion Added To Time Machine Via Tmutil - MacOS
▣

Scoring & Timeline

7.8
HIGH · CVSS v3.1 · product-security@apple.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD22 Oct 2020 · 06:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
🔗

References & Sources

17
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://seclists.org/fulldisclosure/2020/Dec/32Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2020/Nov/19Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2020/Nov/20Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2020/Nov/22Mailing ListThird Party Advisory
https://support.apple.com/kb/HT211288Vendor Advisory
https://support.apple.com/kb/HT211289Vendor Advisory
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