Full Report
Google has released emergency updates to patch another Chrome zero-day vulnerability exploited in attacks, marking the fourth such flaw fixed since the start of the year. [...]
Analysis Summary
# Vulnerability: Actively Exploited Google Chrome Zero-Day (Fourth of 2025)
## CVE Details
- CVE ID: Not explicitly provided for this specific update, but three previous 2025 Chrome zero-days are mentioned (CVE-2025-2783, CVE-2025-4664).
- CVSS Score: Unknown
- CWE: Unknown
## Affected Systems
- Products: Google Chrome
- Versions: Vulnerable versions prior to the applied patch.
- Configurations: Standard installations of Google Chrome.
## Vulnerability Description
Google has released an emergency update fixing the fourth actively exploited zero-day vulnerability in Google Chrome in 2025. The specific technical details of this latest vulnerability are not disclosed in the summary but it has been confirmed to be under active attack.
*Contextual note: The article mentions three previously disclosed, actively exploited Chrome zero-days in 2025:*
1. **CVE-2025-2783:** A high-severity sandbox escape flaw, used in espionage attacks against Russian government organizations and media outlets.
2. **CVE-2025-4664:** A flaw addressed in May that could allow attackers to hijack accounts.
3. **V8 JavaScript Engine Flaw (No CVE listed):** An out-of-bounds read and write weakness discovered in Chrome's V8 JavaScript engine, patched in June.
## Exploitation
- Status: Actively exploited in the wild (for the current vulnerability being summarized). Existing vulnerabilities mentioned were also exploited or demoed.
- Complexity: Unknown for the current CVE, but related flaws involved sandbox escape, account hijacking, and OOB R/W.
- Attack Vector: Likely remote/network/client-side, typical for browser zero-days.
## Impact
- Confidentiality: Presumed High, given the nature of zero-day exploitation, potentially leading to information disclosure or system compromise.
- Integrity: Presumed High, potential for unauthorized modifications or execution.
- Availability: Potential impact depending on the nature of the exploit path.
## Remediation
### Patches
- Google has released an emergency update for Google Chrome to address this vulnerability. Users must update to the latest stable version immediately.
### Workarounds
- No specific workarounds are provided in the text, but general advice for zero-day browser fixes emphasizes immediate patching.
## Detection
- Detection information is not specified for this particular vulnerability. Security teams should focus on endpoint telemetry for unusual process behavior spawned by the Chrome renderer process.
## References
- Vendor Advisory: Google Security Bulletin (Implied update release).
- Relevant links - defanged:
- bleepingcomputer.com/news/security/google-fixes-fourth-actively-exploited-chrome-zero-day-of-2025/
- bleepingcomputer.com/news/security/google-fixes-chrome-zero-day-exploited-in-espionage-campaign/ (For CVE-2025-2783)
- bleepingcomputer.com/news/security/google-fixes-high-severity-chrome-flaw-with-public-exploit/ (For CVE-2025-4664)
- bleepingcomputer.com/news/security/google-patches-new-chrome-zero-day-bug-exploited-in-attacks/ (For V8 flaw)