How severe is CVE-2025-11091?

CVE-2025-11091 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-2025-11091 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-11091?

CVE-2025-11091 affects Tenda Ac21 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-11091?

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-2025-11091 have an EU (EUVD) identifier?

Yes. CVE-2025-11091 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-31447.

When was CVE-2025-11091 published?

CVE-2025-11091 was published on 2025-09-28 and last updated on 2026-06-17.

CVE-2025-11091

CVE-2025-11091 is a high-severity vulnerability in Tenda Ac21 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-119.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
CVSS v4: 7.4
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-31447
Weakness: CWE-119
Affected product: Tenda Ac21 Firmware
Published: 2025-09-28
Last modified: 2026-06-17

Description

A security flaw has been discovered in Tenda AC21 up to 16.03.08.16. Affected by this vulnerability is the function sscanf of the file /goform/SetStaticRouteCfg. The manipulation of the argument list results in buffer overflow. The attack can be launched remotely. The exploit has been released to the public and may be exploited.

Frequently asked questions

What is CVE-2025-11091?: A security flaw has been discovered in Tenda AC21 up to 16.03.08.16. Affected by this vulnerability is the function sscanf of the file /goform/SetStaticRouteCfg. The manipulation of the argument list results in buffer overflow. The attack can be launched remotely. The exploit has been released to the public and may be exploited.
How severe is CVE-2025-11091?: CVE-2025-11091 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-2025-11091 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-11091?: CVE-2025-11091 affects Tenda Ac21 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-11091?: 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-2025-11091 have an EU (EUVD) identifier?: Yes. CVE-2025-11091 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-31447.
When was CVE-2025-11091 published?: CVE-2025-11091 was published on 2025-09-28 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:tenda:ac21_firmware:*:*:*:*:*:*:*:*

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