CVE-2025-0999 in Chrome
Summary
by MITRE • 02/19/2025
Heap buffer overflow in V8 in Google Chrome prior to 133.0.6943.126 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: High)
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 04/08/2025
This heap buffer overflow vulnerability exists within the V8 JavaScript engine used by Google Chrome and other Chromium-based browsers. The flaw manifests when processing specially crafted HTML content that triggers improper memory management during JavaScript execution. The vulnerability falls under the category of memory corruption issues that can lead to arbitrary code execution. According to the Chromium security severity classification, this represents a high-risk vulnerability that could be exploited remotely without user interaction, making it particularly dangerous in web browsing environments.
The technical implementation of this vulnerability involves a heap buffer overflow condition where maliciously constructed HTML elements or JavaScript code cause the V8 engine to write beyond allocated memory boundaries. This occurs during the parsing or execution of JavaScript code within the browser's rendering engine, specifically when handling certain array operations or memory allocation patterns. The flaw exploits the underlying memory management mechanisms of the V8 engine, which is responsible for executing JavaScript code in web browsers. Such buffer overflows typically occur when input validation is insufficient and the engine does not properly bounds-check memory operations before writing data to heap-allocated memory regions.
The operational impact of this vulnerability extends beyond simple browser crashes, as it provides potential attackers with opportunities to execute arbitrary code on affected systems. Remote exploitation requires only a malicious website that loads the crafted HTML content, making it particularly dangerous for users who browse the internet without proper security measures. Successful exploitation could allow attackers to bypass security mitigations such as address space layout randomization and data execution prevention. The vulnerability affects all versions of Chrome prior to 133.0.6943.126, representing a significant attack surface for threat actors who could leverage this flaw in targeted campaigns or automated exploitation tools.
Mitigation strategies should prioritize immediate patching of affected Chrome installations to version 133.0.6943.126 or later, which contains the necessary memory safety fixes. Organizations should implement network-based protections such as web application firewalls and content filtering solutions to block known malicious domains. Browser hardening measures including disabling unnecessary JavaScript features, implementing strict content security policies, and using sandboxing technologies can reduce the attack surface. Additionally, security monitoring should be enhanced to detect unusual memory allocation patterns or potential exploitation attempts. This vulnerability aligns with CWE-121 heap-based buffer overflow and represents a potential technique in the ATT&CK framework under the 'Exploitation for Client Execution' tactic, where adversaries leverage browser vulnerabilities to gain remote code execution capabilities.