Security Resilience

CVE-2019-8506

Memory Safety in Apple Icloud ≤ 7.11

CISA KEVActive ExploitationEUVD ExploitedMemory Safety
Published
18 December 2019
Modified
23 October 2025
KEV Added
04 May 2022
Patch / advisory
View advisory
CVSS Score v3.1 8.8
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS Score 0.16 97th percentile
Risk Priority 90 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2019-8506 is a high-severity Type Confusion (CWE-843) vulnerability in Apple Icloud. Its CVSS base score is 8.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Junk Data (T1001.001); ranked in the top 3% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

A type confusion vulnerability, tracked as CVE-2019-8506 and assigned CWE-843, was present in the WebKit component used for processing web content. It affected multiple Apple platforms and applications, specifically iOS prior to 12.2, tvOS prior to 12.2, watchOS prior to 5.2, Safari prior to 12.1, iTunes for Windows prior to 12.9.4, and iCloud for Windows prior to 7.11. The flaw was resolved through improved memory handling in those releases.

An attacker can exploit the issue by serving maliciously crafted web content to a victim. With network access and no privileges required, successful exploitation leads to arbitrary code execution on the target system, carrying high impact to confidentiality, integrity, and availability as reflected in its CVSS 3.1 score of 8.8.

Apple security advisories corresponding to the listed support URLs detail the affected builds and direct users to apply the listed updates, which contain the memory-handling fixes that prevent the type confusion from being triggered during web content processing.

EU & UK References

Vulnerability Data

A type confusion issue was addressed with improved memory handling. This issue is fixed in iOS 12.2, tvOS 12.2, watchOS 5.2, Safari 12.1, iTunes 12.9.4 for Windows, iCloud for Windows 7.11. Processing maliciously crafted web content may lead to arbitrary…

more

code execution.

CWE(s)
CWE-843
KEV Date Added
04 May 2022

Related Threats

MITRE ATT&CK Enterprise Techniques

T1001.001 Junk Data Command And Control
Adversaries may add junk data to protocols used for command and control to make detection more difficult.
attack.mitre.org →
T1003 OS Credential Dumping Credential Access
Adversaries may attempt to dump credentials to obtain account login and credential material, normally in the form of a hash or a clear text password.
attack.mitre.org →
T1003.005 Cached Domain Credentials Credential Access
Adversaries may attempt to access cached domain credentials used to allow authentication to occur in the event a domain controller is unavailable.
attack.mitre.org →
T1003.006 DCSync Credential Access
Adversaries may attempt to access credentials and other sensitive information by abusing a Windows Domain Controller's application programming interface (API)(Citation: Microsoft DRSR Dec 2017) (Citation: Microsoft GetNCCChanges) (Citati…
attack.mitre.org →
T1005 Data from Local System Collection
Adversaries may search local system sources, such as file systems, configuration files, local databases, virtual machine files, or process memory, to find files of interest and sensitive data prior to Exfiltration.
attack.mitre.org →
T1011.001 Exfiltration Over Bluetooth Exfiltration
Adversaries may attempt to exfiltrate data over Bluetooth rather than the command and control channel.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2020-27932Same product: Apple Icloudboth on KEV
CVE-2022-42856Same product: Apple Iphone Osboth on KEV
CVE-2024-23222Same product: Apple Iphone Osboth on KEV
CVE-2023-23529Same product: Apple Iphone Osboth on KEV
CVE-2017-5070Same product: Redhat Enterprise Linux Desktopboth on KEV
CVE-2021-30869Same product: Apple Iphone Osboth on KEV
CVE-2017-11292Same product: Redhat Enterprise Linux Desktopboth on KEV
CVE-2023-32439Same product: Apple Iphone Osboth on KEV
CVE-2021-1789Same product: Apple Iphone Osboth on KEV
CVE-2017-8291Same product: Redhat Enterprise Linux Desktopboth on KEV

Affected Assets

apple
icloud
≤ 7.11
apple
itunes
≤ 12.9.4
apple
safari
≤ 12.1
apple
iphone os
≤ 12.2
apple
tvos
≤ 12.2
apple
watchos
≤ 5.2
redhat
enterprise linux desktop
7.0
redhat
enterprise linux server
7.0
redhat
enterprise linux workstation
7.0

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V1.5.2
  • V15.3.5

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 partial match
blocks

Secure SDLC practices directly prevent type-confusion flaws via safe typing, static analysis, and code review while the control itself addresses many additional weaknesses.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.5.14 Information transfer partial match
removes
A.5.15 Access control partial match
removes
A.5.16 Identity management partial match
removes
A.5.17 Authentication information partial match
removes
A.5.18 Access rights partial match
removes
A.8.10 Information deletion partial match
removes

References