CVE-2025-51726 Weak cryptography in n/a
Weak SHA-1 signing and missing ASLR in the CyberGhost VPN installer allow attackers to forge signatures and exploit memory corruption for code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-51726?
CVE-2025-51726 is a high-severity vulnerability in n/a, published on 4 Aug 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
CyberGhostVPNSetup.exe (Windows installer) is signed using the weak cryptographic hash algorithm SHA-1, which is vulnerable to collision attacks. This allows a malicious actor to craft a fake installer with a forged SHA-1 certificate that may still be accepted by Windows signature verification mechanisms, particularly on systems without strict SmartScreen or trust policy enforcement. Additionally, the installer lacks High Entropy Address Space Layout Randomization (ASLR), as confirmed by BinSkim (BA2015 rule) and repeated WinDbg analysis. The binary consistently loads into predictable memory ranges, increasing the success rate of memory corruption exploits. These two misconfigurations, when combined, significantly lower the bar for successful supply-chain style attacks or privilege escalation through fake installers.
Weakness: CWE-327
Which versions are affected by CVE-2025-51726?
How do I fix CVE-2025-51726?
No fix has been published for CVE-2025-51726 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-51726 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-51726 exists.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-hxjr-jx9x-w63w.