How severe is CVE-2025-5855?

CVE-2025-5855 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-5855 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-5855?

CVE-2025-5855 affects Tenda Ac6 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-5855?

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

Does CVE-2025-5855 have an EU (EUVD) identifier?

Yes. CVE-2025-5855 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-17421.

When was CVE-2025-5855 published?

CVE-2025-5855 was published on 2025-06-09 and last updated on 2026-06-17.

CVE-2025-5855

CVE-2025-5855 is a high-severity vulnerability in Tenda Ac6 Firmware with a CVSS 3.x base score of 8.8. 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-787.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
CVSS v4: 7.4
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-17421
Weakness: CWE-787
Affected product: Tenda Ac6 Firmware
Published: 2025-06-09
Last modified: 2026-06-17

Description

A vulnerability, which was classified as critical, was found in Tenda AC6 15.03.05.16. This affects the function formSetRebootTimer of the file /goform/SetRebootTimer. The manipulation of the argument rebootTime leads to stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.

Frequently asked questions

What is CVE-2025-5855?: A vulnerability, which was classified as critical, was found in Tenda AC6 15.03.05.16. This affects the function formSetRebootTimer of the file /goform/SetRebootTimer. The manipulation of the argument rebootTime leads to stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.
How severe is CVE-2025-5855?: CVE-2025-5855 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-5855 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-5855?: CVE-2025-5855 affects Tenda Ac6 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-5855?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-5855 have an EU (EUVD) identifier?: Yes. CVE-2025-5855 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-17421.
When was CVE-2025-5855 published?: CVE-2025-5855 was published on 2025-06-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:tenda:ac6_firmware:15.03.05.16:*:*:*:*:*:*:*

More vulnerabilities in Tenda Ac6 Firmware

CVE-2025-52221 — Critical (CVSS 9.8): Tenda AC6 15.03.05.16_multi is vulnerable to Buffer Overflow in the formSetCfm function via the funcname, funcpara1,…
CVE-2025-27129 — Critical (CVSS 9.8): An authentication bypass vulnerability exists in the HTTP authentication functionality of Tenda AC6 V5.0 V02.03.01.110.…
CVE-2025-29031 — Critical (CVSS 9.8): Tenda AC6 v15.03.05.16 was discovered to contain a buffer overflow via the fromAddressNat function.
CVE-2025-29030 — Critical (CVSS 9.8): Tenda AC6 v15.03.05.16 was discovered to contain a buffer overflow via the formWifiWpsOOB function.
CVE-2025-29029 — Critical (CVSS 9.8): Tenda AC6 v15.03.05.16 was discovered to contain a buffer overflow via the formSetSpeedWan function.
CVE-2025-25343 — Critical (CVSS 9.8): Tenda AC6 V15.03.05.16 firmware has a buffer overflow vulnerability in the formexeCommand function.

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