How severe is CVE-2018-25318?

CVE-2018-25318 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-25318 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-25318?

CVE-2018-25318 primarily affects Tenda Fh303 Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-25318?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2018-25318 have an EU (EUVD) identifier?

Yes. CVE-2018-25318 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2018-21839.

When was CVE-2018-25318 published?

CVE-2018-25318 was published on 2026-04-29 and last updated on 2026-06-17.

CVE-2018-25318

CVE-2018-25318 is a critical-severity vulnerability in Tenda Fh303 Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-290.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 9.3
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2018-21839
Weakness: CWE-290
Affected product: Tenda Fh303 Firmware
Published: 2026-04-29
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2018-25318?: CVE-2018-25318 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-25318 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-25318?: CVE-2018-25318 primarily affects Tenda Fh303 Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-25318?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2018-25318 have an EU (EUVD) identifier?: Yes. CVE-2018-25318 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2018-21839.
When was CVE-2018-25318 published?: CVE-2018-25318 was published on 2026-04-29 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:o:tenda:fh303_firmware:5.07.68_en:*:*:*:*:*:*:*
cpe:2.3:o:tenda:a300_firmware:5.07.68_en:*:*:*:*:*:*:*

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