TP-Link Archer C50 (EOL) Exposed: Hardcoded DES Key Allows Sensitive Config Decryption (CVE-2025-6982)
Ddos 
The CERT Coordination Center (CERT/CC) has issued a vulnerability note concerning a flaw in the TP-Link Archer C50 router, identified as CVE-2025-6982. The vulnerability arises from the use of hardcoded DES decryption keys within the router’s firmware, a misstep that places countless home and small office networks at risk.
“The TP-Link Archer C50 router, which has reached End-of-Life (EOL), contains a hardcoded encryption key in its firmware, enabling decryption of sensitive configuration files,” CERT/CC warns.
This flaw allows attackers to easily extract administrative credentials, Wi-Fi passwords, network settings, and other internal configurations by decrypting the router’s exported configuration files—even without physical access or active operation of the router.
The encryption used by the Archer C50 is Data Encryption Standard (DES) in Electronic Codebook (ECB) mode—a known weak method due to its lack of randomness and predictability. Even more concerning is that the key is hardcoded and never randomized per device, which means the same static key applies to every unit.
“The encryption lacks randomness and message authentication, allowing for trivial offline decryption of sensitive data.”
In other words, anyone with the key and an exported config file can unlock a treasure trove of information without needing to compromise the router through typical attack methods.
Unfortunately, TP-Link has discontinued support for the Archer C50 model. According to CERT/CC:
“The CERT/CC is currently unaware of a practical solution to this problem. The TP-Link Archer C50 has reached End-of-Life (EOL) and no longer receives firmware updates or security support from the vendor.”
This leaves users with no official patch or workaround to rely on.
In the absence of a vendor fix, CERT/CC strongly advises the following actions:
- Retire and replace the Archer C50 with a modern, supported router.
- Secure or delete any exported configuration files.
- Change passwords immediately if configuration files were exposed or restored from backups.
- Avoid devices using insecure or outdated cryptographic implementations.
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