Security readout for executives and security teams
Plain-English summary
Apple fixed a flaw in how several operating systems handled font files. A maliciously crafted font could corrupt memory and potentially let an attacker run code. The sources do not state active exploitation. Business urgency depends on whether Apple devices are still below the fixed iOS, iPadOS, macOS, watchOS, or tvOS releases.
Executive priority
Treat this as a high-priority legacy exposure check. The vulnerability permits possible code execution from malicious font processing, but available sources do not show active exploitation. Focus on finding unpatched Apple systems and closing update gaps.
Technical view
CVE-2020-27931 is a memory corruption vulnerability in Apple font file processing. Apple says improved input validation fixed it and that processing a maliciously crafted font may lead to arbitrary code execution. The source bundle does not provide CVSS, CWE, vulnerable version ranges, or deeper root-cause detail.
Likely exposure
Exposure is likely limited to Apple devices running affected pre-fix releases of iOS, iPadOS, macOS, watchOS, or tvOS. The bundle lists products but not exact vulnerable version ranges, so validation must rely on installed OS and security update status.
Exploitation context
The provided sources describe a maliciously crafted font file trigger and arbitrary code execution impact. They do not say this was exploited in the wild, and the CVE is not marked in KEV in the source bundle.
Researcher notes
The record is sparse: no CVSS, CWE, exploit status, or affected version boundaries are supplied. Analysis should stay anchored to Apple’s fixed-release statements and the malicious font processing impact. Avoid assuming which applications or parsers expose the font processing path without additional evidence.
Mitigation direction
- Upgrade iOS and iPadOS devices to 14.0 or later fixed releases.
- Upgrade watchOS devices to 7.0 or later fixed releases.
- Upgrade tvOS devices to 14.0 or later fixed releases.
- Apply macOS Big Sur 11.0.1, Big Sur 11.1, or listed Catalina/Mojave security updates.
- Check current Apple vendor guidance for any newer replacement advisories.
Validation and detection
- Inventory Apple endpoints, mobile devices, watches, and Apple TV systems.
- Compare installed OS versions against the fixed releases named by Apple.
- Confirm Catalina and Mojave systems received the referenced 2020 security updates.
- Review vulnerability management data for devices missing Apple security updates.
- Check mail, web, and endpoint detections for suspicious font-file handling where available.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
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.
Open ATT&CK lookupCVE-2020-27931 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://support.apple.com/en-us/HT211843CVE reference · x_refsource_MISC
- https://support.apple.com/en-us/HT211850CVE reference · x_refsource_MISC
- https://support.apple.com/en-us/HT211844CVE reference · x_refsource_MISC
- https://support.apple.com/en-us/HT211931CVE reference · x_refsource_MISC
- https://support.apple.com/en-us/HT212011CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.