CVE-2022-3075: Google Chromium Mojo Insufficient Data Validation Vulnerability

CVE-2022-3075 is an insufficient data validation flaw in Google Chromium's Mojo component. It allows a remote attacker who has already compromised the renderer process to potentially escape the browser sandbox by means of a crafted HTML page. Because Mojo is part of the Chromium codebase, the issue can affect multiple browsers built on that foundation, including Google Chrome, Microsoft Edge, and Opera. For IT and security teams this matters because a successful sandbox escape can give an attacker broader access to the host system after an initial renderer compromise, elevating the impact of a single malicious page.

Public detail is limited to the description above; exact version ranges, CVSS scores, and exploit mechanics must be confirmed against the vendor advisory. CISA notes that known ransomware use is not documented and simply directs organizations to apply updates per vendor instructions.

How it works

The vulnerability is classified as CWE-20 (Improper Input Validation). In Chromium, Mojo provides inter-process communication between the sandboxed renderer and other privileged browser processes. When data validation is insufficient, an attacker who already controls the renderer can supply malformed messages that the receiving process does not properly reject. The CISA summary states that a crafted HTML page can be used to trigger this condition and potentially achieve a sandbox escape. No further exploit details are provided in the available facts; defenders should treat the flaw as a classic privilege-escalation path from renderer to broader browser privileges and verify the precise attack surface in the vendor advisory.

Am I affected? How to find it in your systems

Any endpoint or server running a Chromium-based browser is potentially in scope. Typical locations include user workstations, VDI images, kiosks, and automated browser instances used for testing or scraping. Inventory steps:

• Enumerate installed browsers (Chrome, Edge, Opera, and other Chromium derivatives) via software inventory tools, package managers, or endpoint management platforms.
• Record the exact browser version and channel (stable, beta, etc.) for each instance; compare those versions against the fixed releases listed in the vendor advisory.
• Identify systems that allow untrusted web content or that run with elevated privileges, as these increase the practical risk of a renderer compromise leading to sandbox escape.

Telemetry signs of exploitation are not detailed in the public facts. In general, look for unexpected process crashes, anomalous Mojo or IPC traffic, or sudden privilege changes originating from browser processes. Correlate any such events with visits to untrusted sites. Confirm detection guidance with the vendor advisory and your own EDR rules.

How to remediate

The primary remediation is to apply the vendor-supplied updates that address CVE-2022-3075. CISA's required action is simply "Apply updates per vendor instructions." After patching:

• Verify that all Chromium-based browsers on managed systems have been updated to the fixed versions listed by the respective vendors.
• Enforce automatic update policies where possible so that future Chromium security releases are installed promptly.
• As a hardening measure for this class of flaw, ensure browsers run with the least privilege necessary, keep sandboxing features enabled, and restrict the ability of users to install unapproved browser extensions that could aid an initial renderer compromise.

Re-inventory after deployment to confirm no outdated instances remain.

If you can't patch immediately

Until the vendor update can be applied, reduce exposure with compensating controls:

• Segment high-risk user populations or systems that routinely browse untrusted content; limit their network access to essential destinations only.
• Deploy or tune web application firewalls and secure web gateways to block known malicious HTML or script patterns that could be used to compromise a renderer, understanding that this is only partial mitigation for a sandbox-escape bug.
• Disable or restrict optional browser features that increase attack surface if they are not required for business use; confirm any such configuration changes against vendor documentation.
• Increase monitoring of browser process trees, looking for unexpected child processes or privilege escalations, and alert on anomalous IPC activity where telemetry is available.

These steps do not eliminate the vulnerability; they only lower the likelihood of successful exploitation until the official patch is installed.

If your data may have been exposed

Actively exploited browser sandbox escapes can lead to full host compromise and subsequent data theft. Although ransomware use is not documented for this CVE, any confirmed exploitation should be treated as a potential breach. Review endpoint and network logs for indicators of post-escape activity, isolate affected systems, and follow your incident-response plan. As a quick check for previously leaked credentials, readers can run a free exposure scan of their email addresses against known breach data sets.