Apple iOS, iPadOS, and macOS Out-of-Bounds Write Vulnerability (CVE-2025-43300) Urgent Security Advisory
Executive & SecOps Summary
SECOPS ASSESSMENTApple devices running iOS/iPadOS versions prior to 15.8.5, 16.7.12, 18.6.2, iPadOS 17.7.10, or macOS versions prior to Sequoia 15.6.1, Sonoma 14.7.8, and Ventura 13.7.8
Processing a maliciously crafted image file may lead to memory corruption, allowing remote attackers to execute arbitrary code or gain full system control without user interaction
Immediately apply the official security patches provided by Apple (iOS 15.8.5, 16.7.12, 18.6.2, iPadOS 17.7.10, macOS 15.6.1, etc.)
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Apply the official Apple security updates immediately. In enterprise environments managed via MDM, administrators should enforce the OS updates. For individual macOS systems, run the following command in the terminal:
# Check and install all available software updates on macOS immediately
sudo softwareupdate -i -a --restart2. Temporary Workaround & Hardening Configuration
If immediate patching is not feasible, disable automatic image downloads in email clients and messaging applications. For high-risk users, enabling Apple's 'Lockdown Mode' is highly recommended to reduce the attack surface by blocking complex web technologies and message attachments.
# Verify if Lockdown Mode is enabled on macOS (returns 1 or true if active)
defaults read com.apple.security.KextAudit LockdownModeActive 2>/dev/null || echo 'Lockdown Mode is inactive'3. Log Audit & IoC Verification Commands
Use the following script to audit the current operating system version and determine if the system is running a vulnerable version.
# macOS version audit script
echo '=== System Version Audit ==='
sw_vers
echo '=== Vulnerability Assessment ==='
OS_VER=$(sw_vers -productVersion)
if [[ '$OS_VER' == 15.* ]] && [[ '$OS_VER' < '15.6.1' ]]; then
echo '[WARNING] macOS Sequoia is VULNERABLE. Upgrade to 15.6.1 immediately.'
elif [[ '$OS_VER' == 14.* ]] && [[ '$OS_VER' < '14.7.8' ]]; then
echo '[WARNING] macOS Sonoma is VULNERABLE. Upgrade to 14.7.8 immediately.'
elif [[ '$OS_VER' == 13.* ]] && [[ '$OS_VER' < '13.7.8' ]]; then
echo '[WARNING] macOS Ventura is VULNERABLE. Upgrade to 13.7.8 immediately.'
else
echo '[INFO] System is patched or running a non-vulnerable OS branch.'
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Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2025-43300) is an Out-of-Bounds Write issue (CWE-787) residing within Apple's image processing framework. The root cause is insufficient bounds checking when parsing image metadata or pixel structures. When the operating system processes a specially crafted malicious image file, it writes data outside the boundary of the allocated memory buffer, leading to severe memory corruption.
2. Exploitation Mechanics & Attack Scenario
An attacker exploits this vulnerability by embedding a malicious payload into an image file (such as a crafted PNG, JPEG, or other supported formats). When a target device renders or processes this image—whether through a web browser, email client, or instant messaging application—the vulnerable parsing library is triggered. With a CVSS score of 10.0 (Critical), this vulnerability requires no privileges or user interaction beyond the rendering of the image. Apple has acknowledged reports indicating that this vulnerability has been actively exploited in highly targeted, sophisticated zero-day attacks.
3. Infrastructure & Business Impact
Given its inclusion in the CISA KEV list, this vulnerability poses an immediate threat to enterprise environments. Compromise of an employee's Apple device (iPhone, iPad, or Mac) can lead to the theft of sensitive corporate data, session tokens, and credentials. Furthermore, compromised endpoints can serve as an initial access point for lateral movement within corporate networks, threatening overall infrastructure integrity.
Official Vendor Advisories & References
An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 15.8.5 and iPadOS 15.8.5, iOS 16.7.12 and iPadOS 16.7.12, iOS 18.6.2 and iPadOS 18.6.2, iPadOS 17.7.10, macOS Sequoia 15.6.1, macOS Sonoma 14.7.8, macOS Ventura 13.7.8. Processing a malicious image file may result in memory corruption. Apple is aware of a report that this issue may have been exploited in an extremely sophisticated attack against specific targeted individuals.
Frequently Asked SecOps Questions (CVE-2025-43300)
FAQQ1. How critical is CVE-2025-43300 and is it actively exploited in the wild?
CVE-2025-43300 is rated CVSS 10.0 (CRITICAL) with a 30-day EPSS exploitation probability of 65.2%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2025-43300?
Primary impacted vendors include apple across ios, ipados, macos. Scope summary: iOS and iPadOS versions prior to 15.8.5, 16.7.12, 18.6.2; iPadOS versions prior to 17.7.10; macOS Sequoia prior to 15.6.1, macOS Sonoma prior to 14.7.8, and macOS Ventura prior to 13.7.8
Q3. What temporary mitigations or workarounds exist for CVE-2025-43300 before patching?
[Mitigation] Immediately apply the official security patches provided by Apple (iOS 15.8.5, 16.7.12, 18.6.2, iPadOS 17.7.10, macOS 15.6.1, etc.) Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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🔗 Related Advisories in Similar Stack (apple)
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