Full Report
Google has released a security update for Chrome to address half a dozen vulnerabilities, one of them actively exploited by attackers to escape the browser's sandbox protection. [...]
Analysis Summary
This summary consolidates the four distinct Chrome zero-day vulnerabilities mentioned in the context, as the provided article aggregates several recent fixes.
# Vulnerability: Multiple Actively Exploited Google Chrome Zero-Days (2025)
## CVE Details
This report summarizes four separate vulnerabilities patched in Google Chrome throughout 2025:
- **CVE ID:** CVE-2025-2783
- **CVSS Score:** High Severity (Specific score not provided)
- **CWE:** Sandbox escape (Implied)
- **CVE ID:** CVE-2025-4664
- **CVSS Score:** Not specified (Described as High-severity)
- **CWE:** Not specified
- **CVE ID:** CVE-2025-5419
- **CVSS Score:** Not specified (Described as Severe)
- **CWE:** Out-of-bounds Read/Write (OOB R/W)
- **CVE ID:** CVE-2025-6554
- **CVSS Score:** Not specified
- **CWE:** Not specified (V8 engine flaw)
## Affected Systems
- **Products:** Google Chrome browser
- **Versions:** Unspecified vulnerable versions prior to the respective patch releases.
- **Configurations:** Standard browser installations susceptible to code execution or sandbox escapes via exploitation of the V8 engine or underlying rendering components.
## Vulnerability Description
The context details four separate zero-day vulnerabilities that Google has patched in Chrome:
1. **CVE-2025-2783:** A sandbox escape flaw exploited in targeted espionage attacks against Russian government and media organizations.
2. **CVE-2025-4664:** A zero-day vulnerability that allowed attackers to hijack user accounts.
3. **CVE-2025-5419:** An out-of-bounds read/write vulnerability within the V8 JavaScript engine.
4. **CVE-2025-6554:** Another flaw impacting the V8 JavaScript engine.
## Exploitation
- **Status:** All four vulnerabilities were **Actively Exploited in the wild** prior to disclosure/patching.
- **Complexity:** Implied to be low to medium to facilitate real-world exploitation campaigns (especially CVE-2025-2783).
- **Attack Vector:** Remotely, likely via malicious websites or content processed by the browser (Network vector).
## Impact
The impact levels are derived from the nature of the vulnerabilities (Sandbox Escape, Account Hijacking, OOB R/W):
- **Confidentiality:** High (Potential for data exfiltration via successful escape)
- **Integrity:** High (Potential for code execution and data manipulation)
- **Availability:** Low to Medium (Impact generally localized to the exploited session unless the payload is designed for service disruption)
## Remediation
### Patches
Specific patch versions are not detailed, but users must update to the versions released by Google subsequent to the discovery of each CVE:
- Update Chrome to patch CVE-2025-2783 (March fix).
- Update Chrome to patch CVE-2025-4664 (May fix).
- Update Chrome to patch CVE-2025-5419 (June fix).
- Update Chrome to patch CVE-2025-6554 (Current month fix).
*Actionable Step: Ensure Google Chrome is updated immediately to the latest stable channel release.*
### Workarounds
No specific workarounds are mentioned, but mitigating active exploitation of browser zero-days usually involves:
1. Disabling JavaScript (as two bugs were in V8).
2. Restricting user access to untrusted websites.
## Detection
- **Indicators of Compromise:** Details are not provided, but successful exploitation would likely result in unauthorized process execution outside the restricted sandbox environment.
- **Detection Methods and Tools:** Monitoring endpoints for Chromium processes attempting unauthorized access to sensitive system resources or unusual network callbacks originating from the renderer process.
## References
- General reference for Google Chrome security updates (Please consult official Google Chrome Release channels for specific version release notes).
- CVE-2025-2783 reference: bleepingcomputer dot com/news/security/google-fixes-chrome-zero-day-exploited-in-espionage-campaign/
- CVE-2025-4664 reference: bleepingcomputer dot com/news/security/google-fixes-high-severity-chrome-flaw-with-public-exploit/
- CVE-2025-5419 reference: bleepingcomputer dot com/news/security/google-patches-new-chrome-zero-day-bug-exploited-in-attacks/
- CVE-2025-6554 reference: bleepingcomputer dot com/news/security/google-fixes-fourth-actively-exploited-chrome-zero-day-of-2025/