CVE-2025-43205 is a vulnerability identified in Apple’s iOS, iPadOS, and related operating systems that allows an application to bypass Address Space Layout Randomization (ASLR). ASLR is a security technique that randomizes the memory addresses used by system and application processes to prevent attackers from reliably executing memory corruption exploits. The vulnerability stems from an out-of-bounds (OOB) access issue caused by insufficient bounds checking in the affected OS components. This flaw allows a malicious app to read or infer memory layout information that should be randomized and hidden, effectively defeating ASLR protections. The issue is classified under CWE-125 (Out-of-bounds Read). The vulnerability affects a broad range of Apple platforms including iOS 18.4, iPadOS 18.4 and 17.7.6, macOS Sequoia 15.4, macOS Sonoma 14.7.5, macOS Ventura 13.7.5, tvOS 18.4, visionOS 2.4, and watchOS 11.4. Apple has addressed the issue by improving bounds checking in these versions. The CVSS v3.1 base score is 4.0, indicating medium severity, with an attack vector requiring local access (AV:L), low attack complexity (AC:L), no privileges required (PR:N), and no user interaction (UI:N). The impact is limited to confidentiality (C:L) with no direct impact on integrity or availability. No known exploits have been reported in the wild as of now. This vulnerability primarily aids attackers in bypassing ASLR, which could be a stepping stone for more advanced exploits such as arbitrary code execution or privilege escalation if chained with other vulnerabilities.

The primary impact of CVE-2025-43205 is the potential bypass of ASLR, a critical security mitigation that protects against memory corruption exploits. By defeating ASLR, attackers gain the ability to predict memory addresses, which significantly increases the likelihood of successful exploitation of other vulnerabilities such as buffer overflows or use-after-free bugs. Although this vulnerability alone does not allow direct code execution or system compromise, it lowers the barrier for attackers to develop more sophisticated exploits. Organizations relying on Apple devices, especially those handling sensitive data or operating in high-security environments, face increased risk if this vulnerability is unpatched. Attackers with local access—such as malicious apps installed on devices—could leverage this flaw to gather memory layout information, potentially leading to further compromise. The lack of required user interaction and privileges makes it easier for attackers to exploit once local access is obtained. The broad range of affected Apple platforms means that enterprises with mixed Apple device deployments are at risk. However, the absence of known exploits in the wild and the medium severity rating suggest the immediate threat is moderate but should not be ignored.

Organizations and users should promptly apply the security updates released by Apple that fix this vulnerability: iOS 18.4, iPadOS 18.4 and 17.7.6, macOS Sequoia 15.4, macOS Sonoma 14.7.5, macOS Ventura 13.7.5, tvOS 18.4, visionOS 2.4, and watchOS 11.4. Beyond patching, organizations should enforce strict app vetting and limit installation of apps from untrusted sources to reduce the risk of local exploitation. Employing Mobile Device Management (MDM) solutions to control app permissions and monitor device integrity can help detect suspicious activity. Additionally, leveraging runtime protections such as sandboxing and mandatory code signing on Apple devices further reduces the attack surface. Security teams should monitor for unusual local app behavior that might indicate attempts to exploit memory vulnerabilities. Regularly updating all Apple devices and educating users about the risks of installing unauthorized apps are essential steps. Finally, integrating this vulnerability into threat modeling and incident response plans will prepare organizations to respond quickly if exploitation attempts arise.