CVE-2026-18330 Hardcoded Shared RSA-1024 Private Key in Web Login in TP-Link RE305 and Archer C7
A hardcoded RSA private key allows attackers to decrypt administrator passwords and compromise session confidentiality on TP-Link Archer AX55 v4 routers.
- 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-2026-18330?
CVE-2026-18330 is a medium-severity vulnerability in TP-Link Systems Inc. Archer C7 v5, published on 3 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A hard-coded cryptographic key vulnerability exists in TP-Link RE305 V3 and Archer C7 V5. The same RSA-1024 private key is stored within firmware configuration files and reused across devices. An attacker who obtains the private key and captures an HTTP Web UI login session may use the key to decrypt the administrator password.
Successful exploitation may disclose the administrator password captured from an HTTP login session and compromise session confidentiality.
Weakness: CWE-321
Which versions are affected by CVE-2026-18330?
How do I fix CVE-2026-18330?
No fix has been published for CVE-2026-18330 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-18330 being exploited?
There is no known exploitation of CVE-2026-18330 in the wild and no public exploit code.
Sources
Also known as GHSA-6x43-g54r-9p4x.