CVE-2021-1738

HIGH

An out-of-bounds write was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave. Processing a mali...

Affects 4 products across 1 vendor.

CVSS 3.17.8
EPSS0.9%
Percentile60th
PatchPatched
CVSS Vector — Plain English Requires local access, low complexity, no authentication required, requires user interaction, impact contained to the vulnerable component, full confidentiality impact, full integrity impact, full availability impact.
CWE Weakness Definitions
CWE-787: Out-of-Bounds Write

Software writes data past buffer boundaries, corrupting memory and potentially enabling code execution.

◆ AI Analysis — automated analysis, not human-reviewed

A vulnerability in macOS Big Sur, Catalina, and Mojave allows for arbitrary code execution through a maliciously crafted image due to an out-of-bounds write issue.

BSID: BS-2021-GLOBAL-239762-H • Model: /workspace/models/qwen2.5-coder-32b-instruct-bf16 • Confidence: HIGH

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Frequently Asked Questions
What is CVE-2021-1738?
A vulnerability in macOS Big Sur, Catalina, and Mojave allows for arbitrary code execution through a maliciously crafted image due to an out-of-bounds write issue.
What is the CVSS score for CVE-2021-1738?
CVE-2021-1738 has CVSS 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. EPSS: 0.9%.
Is CVE-2021-1738 actively exploited?
No confirmed active exploitation of CVE-2021-1738 as of 2026-05-30.
How do I remediate CVE-2021-1738?
Priority: HIGH. Advisory: https://support.apple.com/en-us/HT212147 PSIRT: [email protected]
What systems are affected by CVE-2021-1738?
CVE-2021-1738 affects Apple Mac Os X, Macos, Iphone Os, Ipados.
Vulnerability Details
CVE IDCVE-2021-1738
BSIDBS-2021-GLOBAL-239762-H BreachSpider Global ID
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published2021-04-02
Last Modified2024-11-21
ICS Relevance15%
Weakness (CWE)
Out-of-Bounds Write
SourceNVD
Official Description

An out-of-bounds write was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave. Processing a maliciously crafted image may lead to arbitrary code execution.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

An attacker can exploit this vulnerability by sending a specially crafted image file to a user. If the user opens the image, the vulnerability can be triggered, potentially leading to arbitrary code execution with the privileges of the user.

Exploitation Likelihood: MEDIUM

Affected Products
VendorProductAffected Versions
Apple Mac Os X 10.14.6 10.15.7 ≥ 10.14, < 10.14.6 ≥ 10.15, < 10.15.7
Apple Macos ≥ 11.0, < 11.2
Apple Iphone Os < 14.4
Apple Ipados < 14.4
Remediation
View Vendor Advisory →

Remediation Priority: HIGH

Vendor PSIRT: [email protected]
Threat Intelligence
● Threat Intelligence Validated: October 2026 | Threat Age: 2022 Days
CISA known-exploitedNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
AI Enrichment Record — provenance & audit hash
Model/workspace/models/qwen2.5-coder-32b-instruct-bf16
ConfidenceHIGH
Enriched At2026-05-24
SHA-512 Audit Hashf060089ad14d56a5c8e12f0b307253b4c94ac0ba027aafdc22d5392deab1b75a93f8bff40c60b3c192d309d1490e7ca01e60c08a4a597d9815f17baa810f5763
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