CVE-2022-22674 is an out-of-bounds read vulnerability in Apple macOS. CISA added it to the Known Exploited Vulnerabilities catalogue on 4 April 2022, which means attackers have used it in real attacks. macOS Monterey contains an out-of-bounds read vulnerability that could allow an application to read kernel memory.
What the vulnerability means in macOS
An out-of-bounds read in macOS means a program can be induced to read memory outside the intended buffer boundary. In practice, that can expose kernel memory, destabilise a trusted process, or become a building block for deeper exploitation when an attacker can observe what the system reveals.
The danger is not just the read itself, but the trust boundary it crosses. Kernel-adjacent memory is meant to stay hidden from ordinary applications, so even a read-only weakness can break assumptions about process isolation, memory secrecy, and exploit resistance.
Why an out-of-bounds read is dangerous
Out-of-bounds reads are often prized by attackers because they can leak pointers, object layout details, credentials, or other sensitive state that should never be exposed. That information can weaken exploit mitigations and help an adversary turn a local bug into a more reliable compromise path.
For Apple macOS specifically, the issue matters because the operating system’s security model depends on the kernel preserving memory boundaries. When an application can read kernel memory, the defect can undermine confidentiality and make other exploit steps easier to execute or repeat.
Apple security advisories and the CVE Program are the authoritative places to confirm the exact record, while the NIST National Vulnerability Database is useful for tracking the canonical vulnerability entry and related metadata.
How organisations should assess exposure
Exposure checking starts with asset inventory. Organisations need to know which macOS endpoints are in service, which ones are internet-reachable, and which ones are still running versions or configurations that could be affected by the vulnerability described in the vendor advisory.
Because CISA placed this CVE in the KEV catalogue, it should be treated as a real-world exploitation concern rather than a theoretical software flaw. Teams should prioritise affected Apple devices and verify whether managed endpoints, developer systems, or high-value user workstations are in the risk set.
Where possible, confirm exposure through vendor guidance, endpoint management records, and vulnerability scanning rather than assuming all Apple systems are equally affected. Affectedness depends on the exact product and condition described by Apple, not on the CVE name alone.
Remediation, detection, and recovery review
Remediation should follow the vendor’s fix guidance as soon as it is available and operationally feasible. If patching must be delayed, reduce exposure by limiting untrusted code execution, tightening endpoint hardening, and increasing monitoring around the affected systems.
For detection, focus on whether the vulnerability may have been used to support follow-on activity rather than expecting a neat signature for the read itself. Review endpoint telemetry, crash logs, unusual process behaviour, and any signs that kernel memory exposure was followed by escalation, persistence, or additional payload delivery.
After patching, review whether sensitive material may have been exposed during exploitation. If the compromised system held active sessions, API keys, tokens, or privileged credentials, treat those as potentially exposed and rotate them where operationally justified.
Risk and Threat Considerations
This kind of flaw is dangerous because an out-of-bounds read can leak memory contents without leaving the obvious traces associated with destructive exploits. Attackers often value that visibility because it can reveal secrets, defeat randomisation, or help them adapt a second-stage exploit to the target system.
Failure mechanism: The application crosses a memory boundary and reads kernel or adjacent memory that should remain inaccessible, then the leaked data is reused to support exploitation or privilege escalation.
Impact: Confidentiality is weakened first, and system compromise can become easier to complete or harder to detect if the leak improves attacker reliability or exposes sensitive runtime state.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
NIST SP 800-53 Rev 5, CIS Controls v8 and OWASP ASVS set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | SI-10 — Information Input Validation | Out-of-bounds reads are prevented by strict boundary and input validation in software handling. |
| SI-16 — Memory Protection | The CVE is a macOS memory safety flaw that can expose kernel memory. | |
| RA-5 — Vulnerability Monitoring and Scanning | The page is about an exploited CVE that must be identified across affected assets. | |
| Recommendation — Apply SI-10 to validate indices and lengths before memory access. Use SI-16 to enforce memory protection and prevent unsafe buffer access. Use RA-5 to inventory affected macOS systems and track exposure to the CVE. | ||
| CIS Controls v8 | CIS-7 — Continuous Vulnerability Management | The term is an actively exploited vulnerability and needs prioritised remediation. |
| Recommendation — Use CIS-7 to identify, prioritise, and remediate the affected macOS systems. | ||
| OWASP ASVS | V14 — Data Protection | Memory disclosure can reveal sensitive runtime data that should remain protected. |
| Recommendation — Apply V14 to prevent sensitive data exposure through unsafe memory handling. | ||
Practitioner Guidance
Why practitioners should care: Treat a KEV-listed macOS memory disclosure as a priority issue, not a low-severity curiosity. Even a read-only bug can be operationally important when it helps attackers stage a broader compromise.
What to watch for: Look for signs of repeated exploitation attempts, unusual crashes around the affected component, and downstream indicators such as unexpected privilege changes, session abuse, or suspicious post-exploitation tooling.
Practitioner takeaway: The safest response is to patch quickly, verify that the exposure is actually gone, and assume any credentials or sessions on a compromised host may need review if the bug was plausibly exploited.