CVE-2022-0800 in Edge
Summary
by MITRE • 04/05/2022
Heap buffer overflow in Cast UI in Google Chrome prior to 99.0.4844.51 allowed a remote attacker who convinced a user to engage in specific user interaction to potentially exploit heap corruption via a crafted HTML page.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 07/30/2026
This vulnerability represents a critical heap buffer overflow flaw within the Cast UI component of Google Chrome browsers running versions prior to 99.0.4844.51. The vulnerability falls under the Common Weakness Enumeration category CWE-121, which specifically addresses stack-based buffer overflow conditions that can lead to memory corruption and arbitrary code execution. The flaw occurs when the browser processes crafted HTML content through its Chromecast integration interface, creating a scenario where an attacker can manipulate heap memory allocation patterns to overwrite adjacent memory regions. This type of vulnerability is particularly dangerous because it can be exploited remotely without requiring local system access, making it a prime target for phishing campaigns and drive-by download attacks.
The technical exploitation mechanism involves the Cast UI component's insufficient input validation when handling malformed HTML elements or JavaScript commands that trigger the casting functionality. When a user visits a malicious website containing specially crafted HTML content, the browser's rendering engine processes these elements through the Cast UI subsystem where memory boundaries are not properly enforced. The heap corruption occurs during dynamic memory allocation operations where the application writes beyond allocated buffer limits, potentially overwriting critical data structures or function pointers that control program execution flow.
The operational impact of this vulnerability extends beyond simple memory corruption to encompass potential remote code execution capabilities. Attackers can leverage this flaw to bypass modern security mitigations such as address space layout randomization and data execution prevention mechanisms. The vulnerability's remote exploitability makes it particularly concerning for enterprise environments where users may inadvertently visit malicious websites while browsing the internet. The specific user interaction requirement means that social engineering remains a crucial component of successful exploitation, typically involving convincing victims to click on malicious links or visit compromised websites.
Security professionals should note that this vulnerability aligns with ATT&CK technique T1203, which covers exploitation for gained access through legitimate user credentials and browser-based attacks. The remediation strategy involves immediate patching of Chrome browsers to version 99.0.4844.51 or later, which includes memory safety improvements and enhanced input validation within the Cast UI component. Organizations should also implement network-level protections such as web application firewalls and content filtering solutions to detect and block malicious HTML content targeting this specific vulnerability. Additionally, user education programs should emphasize the importance of avoiding suspicious websites and verifying the legitimacy of casting connections before interacting with unknown web content. The vulnerability demonstrates the ongoing challenges in securing modern browser ecosystems where complex components like casting interfaces can introduce unexpected attack surfaces that require continuous monitoring and updating to maintain security posture against evolving threats.