High‑Severity Memory Corruption in Apple FontParser (CVE‑2020‑27930) Enables Remote Code Execution
What It Is — Apple’s FontParser component in iOS, iPadOS, macOS, and watchOS contains a memory‑corruption flaw that can be triggered by a maliciously crafted font file. Successful exploitation may lead to arbitrary code execution with the privileges of the affected application.
Exploitability — No public exploit has been released, but the vulnerability is rated CVSS 3.1 7.5 (High) and is actively being tracked by CISA’s Known Exploited Vulnerabilities (KEV) catalog, indicating a realistic threat of weaponisation.
Affected Products – Apple iOS 13 + , iPadOS 13 + , macOS 10.15 + , watchOS 6 + (any version that includes the vulnerable FontParser library).
Why It Matters for Trust & Control Assurance
- Demonstrates the need for continuous control mapping: a single library flaw can impact multiple platforms, so evidence of patch management must be linked to the “Vulnerability Management” control objective across frameworks.
- Highlights the importance of defensible audit trails: organisations must retain proof that patches were applied promptly and that affected assets were scanned for malicious fonts.
- Reinforces risk‑based assurance: the same control (e.g., “Maintain up‑to‑date software”) satisfies requirements in NIST CSF, ISO 27001, and SOC 2, providing a unified trust signal to auditors and partners.
Recommended Actions
- Deploy Apple’s security updates that address CVE‑2020‑27930 on all managed devices immediately.
- Verify that mobile device management (MDM) policies enforce the latest OS version and block installation of untrusted font files.
- Update your vulnerability‑management control evidence: capture patch‑deployment logs and scan results as continuous assurance artifacts.
- Map this finding to the “Software Patch Management” control area in your framework of record and record remediation status in the Trust Center.
Source: CISA KEV – CVE‑2020‑27930