CVE intelligence and bounded remediation

CVE-2021-30796 — A logic issue was addressed with improved validation

Medium CVSS 6.5

A logic issue was addressed with improved validation. This issue is fixed in iOS 14.7, macOS Big Sur 11.5, Security Update 2021-004 Catalina, Security Update 2021-005 Mojave. Processing a maliciously crafted image may lead to a denial of service.

Severity
Medium
CVSS
6.5 (3.1)
Published
2021-09-08
CISA KEV
Not currently listed
Ecosystem
apple/platform

Affected products

  • apple / iphone_os
  • apple / mac_os_x / 10.14
  • apple / mac_os_x / 10.14.0
  • apple / mac_os_x / 10.14.1
  • apple / mac_os_x / 10.14.2
  • apple / mac_os_x / 10.14.3

Showing 6 representative product identities from 47 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Resource exhaustion and denial of service

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Identify attacker-influenced work factors including input size, nesting, compression, fan-out, regex cost, allocation, recursion, retries, and connection lifetime.
  • Map per-request and shared CPU, memory, disk, descriptor, thread, queue, and downstream-service limits.
  • Determine whether authentication, tenancy, quotas, and rate controls apply before expensive processing begins.

Remediate safely

  • Bound input size, nesting, expansion, work, concurrency, queue depth, retries, and execution time before resource-intensive processing.
  • Release resources on every success, error, cancellation, and timeout path and use backpressure instead of unbounded buffering.
  • Update affected components and add small deterministic tests that assert resource ceilings rather than exhausting a host.

Authoritative sources

Complete CVE record and remediation plan

The detailed catalog view below loads this exact record, its source evidence, and the full seven-phase agentic change plan.