Published: December 20, 2025 | Category: Cybersecurity Updates
A high-impact week for security professionals. This report covers the latest Zero-Day exploits and critical patches you need to apply before the weekend.
10.0
Max CVSS Score
04
Zero-Days Found
57+
Total Patches
🚨 Critical Vulnerabilities (Action Required)
If your organization uses the following technologies, prioritize these patches immediately to prevent Remote Code Execution (RCE).
| Vendor/Software | CVE ID | Severity | Impact |
|---|---|---|---|
| Cisco AsyncOS | CVE-2025-20393 | 10.0 Critical | Root Access |
| React / Next.js | CVE-2025-55182 | 10.0 Critical | Server Takeover |
| Windows OS | CVE-2025-62221 | 8.8 High | Privilege Escalation |
| Apple WebKit | CVE-2025-14174 | 8.8 High | WebKit Arbitrary Code |
| Chrome | CVE-2025-14765 | 8.8 High | Heap Corruption |
| SonicWall | CVE-2025-40602 | 9.8 Critical | Auth Bypass |
The "React2Shell" Flaw
The most significant developer threat this week is CVE-2025-55182. This vulnerability targets React Server Components (RSC). Attackers can send a maliciously crafted JSON payload to your server-side endpoints, resulting in full shell access.
Mitigation Tip: If you are running React 19.x, update your dependencies immediately using npm install react@latest react-dom@latest.
🛡️ Recommended Weekly Checklist
- ✅ Apply Windows Updates: Address the 72 flaws released in this month's Patch Tuesday.
- ✅ Browser Updates: Ensure Chrome is on version 143.0.7499.146 or higher.
- ✅ Audit Gateway Logs: Check Cisco Secure Email Gateways for unusual root-level activity.