What is CVE-2018-25318?

CVE-2018-25318 is a critical-severity vulnerability in Tenda A300, classified under Authentication Bypass by Spoofing. CVSS score: 9.8/10. Published 2026-04-29.

How severe is CVE-2018-25318?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Tenda A300

CVE-2018-25318

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.

Published 2026-04-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (49.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Tenda A300
Tenda A300 Firmware — versions 5.07.68_en
Tenda Fh303
Tenda Fh303/a300 — versions 5.07.68
Tenda Fh303 Firmware — versions 5.07.68_en

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

www.exploit-db.com/exploits/44381 (Exploit, VDB Entry, Third Party Advisory, exploit)
www.vulncheck.com/advisories/tenda-fh303-a300-68-en-cookie-session-weakness-dns… (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2018-25318?: CVE-2018-25318 is a critical-severity vulnerability in Tenda A300, classified under Authentication Bypass by Spoofing. CVSS score: 9.8/10. Published 2026-04-29.
How severe is CVE-2018-25318?: Critical severity. CVSS v3 base score is 9.8 out of 10.