PatchTheCVECVE-2018-25318: Tenda FH303/A300 firmware V5.07.68_EN contains a session weakness vulnerability that allows unauthenticated at
CVE-2018-25318 is a critical-severity flaw (CVSS 9.8) affecting fh303 firmware, a300 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- Critical severity
- Public exploit reference
- CISA SSVC: automatable with total technical impact
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.7% (top 49%) |
| CISA exploited list | No |
| Weakness | CWE-290 |
| Published | 2026-04-29 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Exact fixes by distribution
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
- Write-up: www.exploit-db.com/exploits/44381
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2018-25318?
fh303 firmware: mitigate or apply the listed mitigation; a300 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2018-25318 being exploited?
CVE-2018-25318 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2018-25318 affect?
CVE-2018-25318 affects fh303 firmware, a300 firmware. Severity is critical (CVSS 9.8). 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/AdvSet
How urgent is CVE-2018-25318?
Priority 60/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action