How severe is CVE-2018-25317?

CVE-2018-25317 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-2018-25317 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-2018-25317?

CVE-2018-25317 primarily affects Tenda W309r Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-25317?

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-2018-25317 have an EU (EUVD) identifier?

Yes. CVE-2018-25317 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2018-21838.

When was CVE-2018-25317 published?

CVE-2018-25317 was published on 2026-04-29 and last updated on 2026-06-17.

CVE-2018-25317

CVE-2018-25317 is a critical-severity vulnerability in Tenda W309r 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-2018-21838
Weakness: CWE-290
Affected product: Tenda W309r Firmware
Published: 2026-04-29
Last modified: 2026-06-17

Description

Tenda W3002R/A302/W309R wireless routers version V5.07.64_en contain a cookie session weakness vulnerability that allows unauthenticated attackers to modify DNS settings by exploiting insufficient session validation. Attackers can send GET requests to the /goform/AdvSetDns endpoint with a crafted admin language cookie to change primary and secondary DNS servers, redirecting user traffic to malicious DNS servers.

Frequently asked questions

What is CVE-2018-25317?: Tenda W3002R/A302/W309R wireless routers version V5.07.64_en contain a cookie session weakness vulnerability that allows unauthenticated attackers to modify DNS settings by exploiting insufficient session validation. Attackers can send GET requests to the /goform/AdvSetDns endpoint with a crafted admin language cookie to change primary and secondary DNS servers, redirecting user traffic to malicious DNS servers.
How severe is CVE-2018-25317?: CVE-2018-25317 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-2018-25317 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-2018-25317?: CVE-2018-25317 primarily affects Tenda W309r Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-25317?: 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-2018-25317 have an EU (EUVD) identifier?: Yes. CVE-2018-25317 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2018-21838.
When was CVE-2018-25317 published?: CVE-2018-25317 was published on 2026-04-29 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:o:tenda:w309r_firmware:5.07.64_en:*:*:*:*:*:*:*
cpe:2.3:o:tenda:a302_firmware:5.07.64_en:*:*:*:*:*:*:*
cpe:2.3:o:tenda:w3002r_firmware:5.07.64_en:*:*:*:*:*:*:*

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