CISA Warns of Actively Exploited 0-Day Vulnerability in Apple iOS, iPadOS, and macOS

The Cybersecurity and Infrastructure Security Agency (CISA) has issued an urgent warning about a critical zero-day vulnerability affecting Apple iOS, iPadOS, and macOS systems that is being actively exploited in the wild.

CVE-2025-43300, an out-of-bounds write vulnerability in Apple’s Image I/O framework, poses significant security risks to millions of users across Apple’s ecosystem.

Critical Vulnerability Details

The vulnerability, catalogued as CVE-2025-43300, represents a serious security flaw within Apple’s Image I/O framework, which handles image processing across iOS, iPadOS, and macOS platforms.

This out-of-bounds write vulnerability, classified under CWE-787, allows attackers to write data beyond the intended memory boundaries, potentially leading to arbitrary code execution and complete system compromise.

Out-of-bounds write vulnerabilities are particularly dangerous because they can enable attackers to overwrite critical memory locations, corrupt system data, or execute malicious code with elevated privileges.

In the context of Apple’s Image I/O framework, this vulnerability could be triggered through specially crafted image files, making it accessible through various attack vectors including malicious websites, email attachments, or messaging applications.

CISA’s decision to add CVE-2025-43300 to its Known Exploited Vulnerabilities (KEV) catalog on August 21, 2025, indicates that threat actors are already leveraging this vulnerability in real-world attacks.

The agency’s KEV catalog specifically tracks vulnerabilities that pose significant risks to federal enterprise networks and the broader cybersecurity landscape.

While the connection to ransomware campaigns remains unknown, the active exploitation status makes this vulnerability a high-priority concern for organizations and individual users alike.

The broad scope of affected platforms—encompassing iOS, iPadOS, and macOS—means that virtually the entire Apple ecosystem is potentially vulnerable to attack.

CISA has established September 11, 2025, as the deadline for federal agencies to address this vulnerability, following Binding Operational Directive 22-01 requirements.

Organizations are strongly advised to apply vendor-supplied security updates immediately upon availability or implement recommended mitigations.

For systems where patches are not yet available or mitigations cannot be applied, CISA recommends discontinuing use of affected products until proper security measures can be implemented.

This aggressive stance underscores the severity of the threat posed by CVE-2025-43300 and the urgent need for comprehensive remediation efforts across all affected Apple platforms.

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