CVE-2018-25318: Tenda FH303/A300 V5.07.68_EN Cookie Session Weakness DNS Change

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-04-29 · updated 2026-06-17
Weakness: CWE-290

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.

Affected products

Tenda A300 Firmware: 5.07.68_en
Tenda Fh303 Firmware: 5.07.68_en

References

https://www.exploit-db.com/exploits/44381
https://www.vulncheck.com/advisories/tenda-fh303-a300-68-en-cookie-session-weakness-dns-change

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