CVE-2026-5363 Use of weak cryptographic key in TP-Link Archer C7
An adjacent attacker can recover the admin password by factoring the weak RSA-1024 key used in client-side encryption, leading to full device compromise.
- 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-2026-5363?
CVE-2026-5363 is a medium-severity vulnerability in TP-Link Systems Inc. Archer C7 v5 and v5.8, published on 15 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Inadequate Encryption Strength vulnerability in TP-Link Archer C7 v5 and v5.8 (uhttpd modules) allows Password Recovery Exploitation. The web interface encrypts the admin password client-side using RSA-1024 before sending it to the router during login. An adjacent attacker with the ability to intercept network traffic could potentially perform a brute-force or factorization attack against the 1024-bit RSA key to recover the plaintext administrator password, leading to unauthorized access and compromise of the device configuration. This issue affects Archer C7: through Build 20220715.
Weakness: CWE-326
Which versions are affected by CVE-2026-5363?
It affects 1 product.
Products include Tp-Link Archer C7 Firmware.
How do I fix CVE-2026-5363?
No fix has been published for CVE-2026-5363 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-5363 being exploited?
There is no known exploitation of CVE-2026-5363 in the wild and no public exploit code.
Other vulnerabilities in TP-Link Systems Inc. Archer C7 v5 and v5.8
Sources
Also known as GHSA-r35r-mrc6-xgfp.