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CVE Record

CVE-2020-27933: A memory corruption issue was addressed with improved input validation.

A memory corruption issue was addressed with improved input validation. This issue is fixed in iOS 13.6 and iPadOS 13.6, iCloud for Windows 7.20, watchOS 6.2.8, tvOS 13.4.8, macOS Catalina 10.15.6, Security Update 2020-004 Mojave, Security Update 2020-004 High Sierra. Processing a maliciously crafted image may lead to arbitrary code execution.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Apple fixed a memory corruption flaw where opening or processing a malicious image could allow arbitrary code execution. The affected Apple platforms listed in the sources include iOS/iPadOS, macOS, iCloud for Windows, watchOS, and tvOS. The main business risk is unpatched legacy devices or systems still processing attacker-supplied images.

Executive priority

Treat this as a legacy exposure cleanup item with high impact if still present. Prioritize internet-facing, user-facing, and unmanaged devices that may process images from email, web, messaging, or shared storage.

Technical view

CVE-2020-27933 is an Apple image-processing memory corruption issue addressed with improved input validation. Apple lists fixes in iOS 13.6, iPadOS 13.6, iCloud for Windows 7.20, watchOS 6.2.8, tvOS 13.4.8, macOS Catalina 10.15.6, and Security Update 2020-004 for Mojave and High Sierra.

Likely exposure

Exposure is most likely on legacy Apple devices, Macs, Apple TV/watch assets, or Windows hosts running outdated iCloud for Windows. Environments with unmanaged personal devices, archived macOS builds, or kiosk/media workflows should verify patch levels.

Exploitation context

The sources describe arbitrary code execution from processing a maliciously crafted image. They do not state active exploitation, public exploit availability, or whether interaction beyond image processing is required. CISA KEV is false in the provided bundle.

Researcher notes

The bundle lacks CVSS, CWE, component-level detail, exploit telemetry, and root-cause specifics beyond memory corruption and input validation. Do not assume a particular image format, sandbox escape, or exploitation chain without additional vendor-confirmed evidence.

Mitigation direction

  • Update affected Apple systems to the fixed versions or later.
  • Verify iCloud for Windows is version 7.20 or later where installed.
  • Retire unsupported macOS, iOS, watchOS, and tvOS builds where updates are unavailable.
  • Check Apple security guidance before applying compensating controls.

Validation and detection

  • Inventory Apple endpoints and iCloud for Windows installations.
  • Compare OS and application versions against Apple’s fixed release list.
  • Review MDM, EDR, or asset data for outdated Catalina, Mojave, and High Sierra systems.
  • Confirm systems can process externally supplied images only after patch verification.
Prepared
Confidence
medium
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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ATT&CK lookup starting points

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description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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CVE-2020-27933 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
6Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
AppleiOS and iPadOSunspecifiedListed
ApplemacOSunspecifiedListed
ApplemacOSunspecifiedListed
ApplemacOSunspecifiedListed
ApplemacOSunspecifiedListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.