Fast Facts
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Critical Vulnerability Patched: Apple recently addressed a zero-day flaw in its ImageIO framework (CVE-2025-43300) affecting iOS, iPadOS, and macOS, linked to sophisticated targeted attacks.
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Memory Corruption Risk: The vulnerability allows for out-of-bounds writes that could lead to memory corruption when processing malicious image files.
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Escalating Threats: Apple’s advisories indicate a trend of sophisticated cyberattacks, likely tied to nation-state actors and spyware activities, with recent flaws disclosed hinting at increasing security risks.
- History of Exploitation: Previous vulnerabilities have been exploited, including CVE-2025-24200 and CVE-2025-43200, demonstrating ongoing threats from advanced spyware makers like the NSO Group.
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Apple on Aug. 20 patched a zero-day flaw in its ImageIO framework — the latest in a series of zero-day vulnerabilities disclosed by the company this year.
The vulnerability, tracked as CVE-2025-43300, is an out-of-bounds write issue. The company said the vuln was exploited in “extremely sophisticated” targeted attack. “Processing a malicious image file may result in memory corruption,” Apple’s security advisory stated. “Apple is aware of a report that this issue may have been exploited in an extremely sophisticated attack against specific targeted individuals.”
The flaw affects iOS, iPadOS, and macOS, and it has been addressed with improved bounds checking in the latest versions of the operating systems, according to Apple. The vulnerability was discovered by Apple employees.
As is its custom, Apple provided no further technical details of the vulnerability or insights into the exploitation activity beyond characterizing the cyberattacks as sophisticated. The tech giant began using such terminology in some advisories this year, presumably to signify nation-state threats and spyware activity.
For example, in February, Apple disclosed CVE-2025-24200, a zero-day flaw that allows unauthorized users to disable the company’s USB Restricted Mode. As with CVE-2025-43300’s advisory, Apple said the vulnerability may have been exploited in an “extremely sophisticated” attack and credited Bill Marczak of the Citizen Lab at the University of Toronto’s Munk School, which focuses on commercial spyware activity, with the discovery.
In April, Apple patched another zero-day flaw tracked as CVE-2025-43200, which stemmed from a logic issue in processing a maliciously crafted image or video shared through an iCloud link. In June, the Citizen Lab revealed that the vulnerability had been used in a zero-click iOS exploit from Paragon Solutions, a commercial spyware vendor. Citizen Lab researchers said the spyware attacks targeted two journalists.
Spyware Hack
While CVE-2025-43300 was discovered internally by Apple, a previous ImageIO flaw was weaponized by the notorious spyware maker NSO Group in 2023. The Citizen Lab discovered CVE-2023-41064, a heap buffer overflow vulnerability, in a spyware attack on a civil society organization in Washington, DC.
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