Yes. CISA added CVE-2018-6065 to its Known Exploited Vulnerabilities catalogue on 8 June 2022, which it does only when there is reliable evidence of active exploitation. CISA has not linked it to known ransomware campaigns. Google Chromium V8 Engine contains an integer overflow vulnerability that allows a remote attacker to potentially exploit heap corruption via a crafted HTML page.
What “being exploited in the wild” means for this CVE
For a vulnerability advisory like this, “in the wild” means there is evidence that attackers are already using the flaw against real targets, not just proving it in a lab. That changes the response from routine patch planning to urgent exposure reduction, because active exploitation means the window between disclosure and compromise is already open.
The key question is not whether the bug is interesting in theory, but whether your environment can still reach the vulnerable Chromium V8 code path. If the browser or embedded Chromium component is present anywhere users can open attacker-controlled content, the issue remains relevant even when the exploit details are not public.
For broad prioritisation, use the CISA Known Exploited Vulnerabilities Catalog as the authoritative signal that this is not a speculative weakness. In practice, that should push the CVE into the same response lane as other actively exploited browser flaws, where speed and coverage matter more than perfect certainty about the attacker’s current method.
Why a Chromium V8 integer overflow is operationally dangerous
An integer overflow in a browser engine is dangerous because it can corrupt memory when crafted input is processed. In Chromium V8, that usually means a malicious page can trigger heap corruption during parsing or script handling, which is exactly the sort of failure mode that can lead to code execution or a controlled crash depending on the surrounding protections.
This class of issue is especially sensitive in browsers because the trigger surface is broad and the delivery path is easy: one page load, one redirect, or one embedded advertisement can be enough. Attackers prefer browser engine flaws because they sit close to the user, often bypass user hesitation, and can be combined with social engineering or exploit chains.
Reference the public vulnerability record in the NIST National Vulnerability Database and the underlying CVE Program entry when you need canonical identification. Those sources help confirm the issue identity, while the KEV catalogue tells you why it should be treated as urgent.
How to respond when exposure is still possible
If patching is available, the first move is to confirm which user devices, virtual desktops, kiosks and embedded applications actually ship or depend on the affected Chromium codebase. Browser vulnerabilities are often missed because the visible browser version is not the only relevant component, especially in managed apps, Electron-style wrappers and bundled rendering engines.
If you cannot patch immediately, reduce reachable attack surface by constraining where untrusted web content can be opened, tightening browser policy, and isolating high-risk browsing from privileged workflows. For a fast remediation path, use the Zero-Day and Exploited Vulnerabilities Guide for triage patterns, and the Vulnerability Management Guide for prioritisation and verification discipline.
Browser security matters here because the exploit trigger is content-driven. The Enterprise Browser and Browser Security Guide is useful when you need to pair patching with practical containment, such as extension control, managed browser policy and browser isolation for higher-risk users.
Risk and Threat Considerations
Active exploitation changes the risk profile from “known weakness” to “probable compromise path,” especially for internet-facing users who regularly browse unknown sites or follow unsolicited links. The main exposure is not just browser instability, but the possibility that a crafted page can move from memory corruption into execution on the client.
Failure mechanism: An attacker delivers HTML or script content that drives the V8 integer overflow, corrupts heap state, and uses the resulting memory safety failure to gain code execution or force a crash before defensive controls can intervene.
Impact: Successful exploitation can expose credentials, tokens, session material and local data, then give the attacker a foothold for follow-on phishing, lateral movement or browser-based persistence on the affected endpoint.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
MITRE ATT&CK addresses the attack and risk surface, while NIST CSF 2.0, CIS Controls v8, OWASP ASVS and NIST SP 800-53 Rev 5 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| MITRE ATT&CK | T1189 — Drive-by Compromise | Browser-engine exploitation via crafted web content matches a drive-by delivery path. |
| Recommendation — Map browser-delivered exploitation to drive-by compromise and monitor web access for malicious content delivery. | ||
| NIST CSF 2.0 | DE.CM-01 — Monitoring for Unauthorized Personnel, Connections, Devices, and Software | Active exploitation makes rapid detection and exposure monitoring essential on browser endpoints. |
| Recommendation — Monitor endpoint fleets for exposed Chromium versions and unusual browser execution patterns. | ||
| CIS Controls v8 | CIS-7 — Continuous Vulnerability Management | KEV-listed browser flaws require prioritized discovery, remediation and verification. |
| Recommendation — Prioritize and verify remediation for KEV-listed browser vulnerabilities across all managed assets. | ||
| OWASP ASVS | V15 — Secure Coding and Architecture | Integer overflow is a memory-safety weakness that maps to secure architecture and coding discipline. |
| Recommendation — Apply secure coding controls that prevent integer overflow and memory corruption in browser-related components. | ||
| NIST SP 800-53 Rev 5 | SI-2 — Flaw Remediation | Actively exploited vulnerabilities require rapid remediation tracking and closure. |
| Recommendation — Accelerate flaw remediation for the affected browser engine and confirm deployment completion. | ||
Practitioner Guidance
What to prioritise: Treat endpoints that browse the open internet, handle sensitive SaaS sessions or run privileged admin workflows as the highest-value remediation targets. Those systems create the fastest path from browser compromise to meaningful business impact.
What to verify: Confirm not only the installed browser version, but also whether Chromium is embedded in other applications, auto-updated, or repackaged by a desktop platform. That is where exposure is often missed in inventory and patch reports.
Practitioner takeaway: When a browser CVE is already in KEV, the question is no longer whether exploitation is possible, but whether any reachable Chromium-based surface remains exposed long enough for an attacker to use it.