Exploit / PoCcritical
Cisco email security appliances rooted and backdoored via still unpatched zero-day
Vulnerabilities mentioned
All| CVE | Vulnerability | CVSS | EPSS | Signals | Published |
|---|---|---|---|---|---|
| CVE-2025-20393 | Improper Input Validation in Cisco Secure Email and Web Appliances Allows Root Commands | 10.0 | 32% | KEV | KEV |
| CVE-2025-5777 | Out-of-Bounds Read (Memory Overread) in Citrix NetScaler ADC and Gateway | 9.3 | 100% | KEVRansomware | KEV |
| CVE-2025-7775 | Actively Exploited Memory Overflow RCE/DoS in Citrix NetScaler ADC/Gateway | 9.2 | 21% | KEV | KEV |
From the original article
3 min read at helpnetsecurity.com
A suspected Chinese-nexus threat group has been compromising Cisco email security devices and planting backdoors and log-purging tools on them since at least late November 2025, Cisco Talos researchers have shared. “Our analysis indicates that appliances with non-standard configurations (…) are what we have observed as being compromised by the attack,” they noted.
By @zeljkazorz · helpnetsecurity.com
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