Yes. CISA added CVE-2024-5274 to its Known Exploited Vulnerabilities catalogue on 28 May 2024, which it does only when there is reliable evidence of active exploitation. CISA has not linked it to known ransomware campaigns. Google Chromium V8 contains a type confusion vulnerability that allows a remote attacker to execute code via a crafted HTML page.
How KEV listing answers the “exploited in the wild” question
For this CVE, the practical answer is that CISA’s KEV catalogue entry is the strongest public indicator that exploitation is not theoretical. KEV inclusion means CISA has enough evidence to treat the issue as actively exploited, so defenders should assume real-world targeting rather than waiting for a separate proof-of-exploit write-up.
That matters because browser vulnerabilities are usually exposed through ordinary user activity, not administrative access. A crafted page can become the delivery mechanism, so exposure depends less on the server side and more on whether users can reach vulnerable Chromium builds and render untrusted content.
Public exploit confirmation also changes how you prioritise the issue. KEV status should push the CVE ahead of routine backlog work, especially when the affected browser is widely deployed across managed and unmanaged endpoints.
When the subject is an actively exploited browser flaw, it helps to treat the browser as part of the attack surface, not just the endpoint. NHI Management Group’s Enterprise Browser and Browser Security Guide is useful here because browser policy, isolation and extension control determine how much damage a successful exploit can do.
What type confusion in V8 changes about the risk
Type confusion in the JavaScript engine is valuable to attackers because it can cross a boundary the browser normally relies on for safety. Instead of merely crashing a tab, the flaw can let malicious code influence memory handling in a way that becomes code execution when triggered by a malicious page.
That makes the issue more than a content problem. The vulnerable path is remote, user-driven and scalable, which is why browser exploitation is attractive for drive-by compromise, watering-hole activity and chained exploits that begin with a page view.
This also explains why exploitability is often independent of the victim’s role. A standard employee laptop, developer workstation or kiosk can all be viable targets if the browser version is exposed and the user opens attacker-controlled content.
CISA’s KEV process is the authoritative source for deciding whether the issue should be handled as actively exploited, while the broader vulnerability handling workflow is best anchored in a formal triage process such as NHI Management Group’s Vulnerability Management Guide, which covers asset scope, prioritisation and remediation tracking.
What to do while exposure remains open
If you cannot patch immediately, the decision is not to wait passively. Reduce exposure by limiting browser use on high-risk endpoints, tightening access to untrusted content, and making sure the vulnerable browser is not the default path for sensitive workflows.
At the same time, confirm whether the issue is already present in your fleet, not just whether it is approved in software inventory. A browser exploit can succeed long before asset owners realise the browser channel is stale, especially in environments with mixed managed and unmanaged endpoints.
Because KEV-listed issues are already exploited, defenders should also check for earlier compromise if the vulnerable browser was present before remediation. Review relevant endpoint telemetry, browser history where available, suspicious child processes, and unusual downloads or script activity around the exposure window.
When browser compromise can expose saved credentials or session material, it is sensible to treat the browser profile as potentially contaminated. Rotation of affected sessions and credentials becomes material when the exposed browser can access email, identity providers, SaaS consoles or developer tools.
Risk and Threat Considerations
Active exploitation turns a browser bug into a live access path. The main risk is not the abstract vulnerability, but the combination of remote delivery, wide endpoint reach and the possibility that a single page view can trigger code execution before users notice anything unusual.
Failure mechanism: A crafted HTML page exercises the V8 type confusion condition, allowing attacker-controlled code execution in the browser process or adjacent context, which can then be used for payload delivery, persistence setup or credential theft.
Impact: Successful exploitation can lead to endpoint compromise, browser session abuse, theft of accessible secrets or follow-on lateral movement if the browser has reach into cloud, identity or internal applications.
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 CIS Controls v8, NIST SP 800-53 Rev 5 and OWASP ASVS set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | CIS-7 — Continuous Vulnerability Management | Actively exploited browser CVEs require prioritised identification and remediation. |
| Recommendation — Prioritise KEV-listed browser flaws for rapid remediation and exception tracking. | ||
| NIST SP 800-53 Rev 5 | SI-2 — Flaw Remediation | This CVE response depends on timely patching and mitigation of a known exploited flaw. |
| RA-5 — Vulnerability Monitoring and Scanning | Confirming exposure and finding stale browser versions requires continuous vulnerability visibility. | |
| Recommendation — Apply flaw remediation controls to accelerate patching and mitigation for the browser vulnerability. Scan for affected browser versions and validate exposure across managed and unmanaged endpoints. | ||
| OWASP ASVS | V15 — Secure Coding and Architecture | Type confusion in the browser engine is a software security failure relevant to defensive assurance. |
| Recommendation — Use secure coding and architecture reviews to reduce memory-safety weaknesses in browser-facing software. | ||
| MITRE ATT&CK | T1189 — Drive-by Compromise | A crafted HTML page delivering exploitation matches browser-based initial access. |
| Recommendation — Hunt for drive-by compromise activity tied to malicious pages and browser exploitation. | ||
Practitioner Guidance
What to prioritise: Treat KEV-listed browser flaws as exposure-management problems first, not routine patch tasks. Prioritise internet-facing, user-heavy and privilege-rich endpoints where a browser session can open access to sensitive systems.
What to verify: Confirm the exact browser channel and fleet ownership before trusting inventory, because unmanaged or rarely rebooted endpoints often lag the approved patch state. Also verify whether users with the vulnerable browser hold active sessions to high-value services.
Decision rule: If patching must wait, shorten the attacker window by reducing exposure to untrusted browsing, limiting use of the vulnerable browser for sensitive work and preparing session revocation for any endpoint that may have been reached during the exposure period.
Practitioner takeaway: KEV inclusion means the question is no longer “could this be exploited?” but “where could exploitation still succeed in our environment, and what should be assumed compromised until proven otherwise?”
Related resources from NHI Mgmt Group
- Is CVE-2024-7971 (Google Chromium V8 Type Confusion) being exploited in the wild?
- Is CVE-2025-10585 (Google Chromium V8 Type Confusion) being exploited in the wild?
- Is CVE-2025-6554 (Google Chromium V8 Type Confusion) being exploited in the wild?
- How do you patch or mitigate CVE-2024-5274 (Google Chromium V8 Type Confusion)?