How severe is CVE-2025-15255?

CVE-2025-15255 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-2025-15255 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-15255?

CVE-2025-15255 affects Tenda W6-s Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-15255?

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-2025-15255 have an EU (EUVD) identifier?

Yes. CVE-2025-15255 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-205819.

When was CVE-2025-15255 published?

CVE-2025-15255 was published on 2025-12-30 and last updated on 2026-06-17.

CVE-2025-15255

CVE-2025-15255 is a critical-severity vulnerability in Tenda W6-s 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-119.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
CVSS v4: 8.9
EPSS exploit prediction: 4% (89th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-205819
Weakness: CWE-119
Affected product: Tenda W6-s Firmware
Published: 2025-12-30
Last modified: 2026-06-17

Description

A vulnerability was determined in Tenda W6-S 1.0.0.4(510). This impacts an unknown function of the file /bin/httpd of the component R7websSsecurityHandler. Executing a manipulation of the argument Cookie can lead to stack-based buffer overflow. The attack may be launched remotely. The exploit has been publicly disclosed and may be utilized.

Frequently asked questions

What is CVE-2025-15255?: A vulnerability was determined in Tenda W6-S 1.0.0.4(510). This impacts an unknown function of the file /bin/httpd of the component R7websSsecurityHandler. Executing a manipulation of the argument Cookie can lead to stack-based buffer overflow. The attack may be launched remotely. The exploit has been publicly disclosed and may be utilized.
How severe is CVE-2025-15255?: CVE-2025-15255 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-2025-15255 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-15255?: CVE-2025-15255 affects Tenda W6-s Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-15255?: 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-2025-15255 have an EU (EUVD) identifier?: Yes. CVE-2025-15255 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-205819.
When was CVE-2025-15255 published?: CVE-2025-15255 was published on 2025-12-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:tenda:w6-s_firmware:1.0.0.4\(510\):*:*:*:*:*:*:*

More vulnerabilities in Tenda W6-s Firmware

CVE-2022-45497 — Critical (CVSS 9.8): Tenda W6-S v1.0.0.4(510) was discovered to contain a command injection vulnerability in the tpi_get_ping_output…
CVE-2025-28221 — High (CVSS 7.5): Tenda W6_S v1.0.0.4_510 has a Buffer Overflow vulnerability in the set_local_time function, which allows remote…
CVE-2025-28220 — High (CVSS 7.5): Tenda W6_S v1.0.0.4_510 has a Buffer Overflow vulnerability in the setcfm function, which allows remote attackers to…
CVE-2022-45504 — High (CVSS 7.5): An issue in the component tpi_systool_handle(0) (/goform/SysToolRestoreSet) of Tenda W6-S v1.0.0.4(510) allows…
CVE-2022-45503 — High (CVSS 7.5): Tenda W6-S v1.0.0.4(510) was discovered to contain a stack overflow via the linkEn parameter at /goform/setAutoPing.
CVE-2022-45501 — High (CVSS 7.5): Tenda W6-S v1.0.0.4(510) was discovered to contain a stack overflow via the wl_radio parameter at /goform/wifiSSIDset.

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