CVE-2018-25318 Tenda FH303/A300 V5.07.68_EN Cookie Session Weakness DNS Change
Unauthenticated attackers can bypass authentication via weak cookie validation to modify DNS settings on Tenda routers, enabling traffic redirection.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2018-25318?
CVE-2018-25318 is a critical authentication bypass vulnerability in Tenda FH303/A300, published on 29 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Tenda FH303/A300 firmware V5.07.68_EN contains a session weakness vulnerability that allows unauthenticated attackers to modify DNS settings by exploiting insufficient cookie validation. Attackers can send GET requests to the /goform/AdvSetDns endpoint with a crafted admin cookie to change DNS servers and redirect user traffic to malicious sites.
Weakness: CWE-290
Which versions are affected by CVE-2018-25318?
It affects 2 products.
Products include Tenda A300 Firmware, Tenda Fh303 Firmware.
How do I fix CVE-2018-25318?
No fix has been published for CVE-2018-25318 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2018-25318 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2018-25318 exists.
Sources
Also known as GHSA-j5r6-25m9-65r7.