How severe is CVE-2025-12611?

CVE-2025-12611 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-2025-12611 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-2025-12611?

CVE-2025-12611 affects Tenda Ac21 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-12611?

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-2025-12611 have an EU (EUVD) identifier?

Yes. CVE-2025-12611 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-37467.

When was CVE-2025-12611 published?

CVE-2025-12611 was published on 2025-11-03 and last updated on 2026-06-17.

CVE-2025-12611

CVE-2025-12611 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-120.

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-2025-37467
Weakness: CWE-120
Affected product: Tenda Ac21 Firmware
Published: 2025-11-03
Last modified: 2026-06-17

Description

A vulnerability was identified in Tenda AC21 16.03.08.16. This vulnerability affects the function formSetPPTPServer of the file /goform/SetPptpServerCfg. The manipulation of the argument startIp leads to buffer overflow. Remote exploitation of the attack is possible. The exploit is publicly available and might be used.

Frequently asked questions

What is CVE-2025-12611?: A vulnerability was identified in Tenda AC21 16.03.08.16. This vulnerability affects the function formSetPPTPServer of the file /goform/SetPptpServerCfg. The manipulation of the argument startIp leads to buffer overflow. Remote exploitation of the attack is possible. The exploit is publicly available and might be used.
How severe is CVE-2025-12611?: CVE-2025-12611 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-2025-12611 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-2025-12611?: CVE-2025-12611 affects Tenda Ac21 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-12611?: 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-2025-12611 have an EU (EUVD) identifier?: Yes. CVE-2025-12611 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-37467.
When was CVE-2025-12611 published?: CVE-2025-12611 was published on 2025-11-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:tenda:ac21_firmware:16.03.08.16:*:*:*:*:*:*:*

More vulnerabilities in Tenda Ac21 Firmware

CVE-2025-9605 — Critical (CVSS 9.8): A security vulnerability has been detected in Tenda AC21 and AC23 16.03.08.16. Affected is the function…
CVE-2026-4565 — High (CVSS 8.8): A vulnerability was detected in Tenda AC21 16.03.08.16. Impacted is the function formSetQosBand of the file…
CVE-2026-1637 — High (CVSS 8.8): A vulnerability was identified in Tenda AC21 16.03.08.16. The affected element is the function fromAdvSetMacMtuWan of…
CVE-2025-13446 — High (CVSS 8.8): A vulnerability has been found in Tenda AC21 16.03.08.16. This vulnerability affects unknown code of the file…
CVE-2025-13445 — High (CVSS 8.8): A flaw has been found in Tenda AC21 16.03.08.16. This affects an unknown part of the file /goform/SetIpMacBind.…
CVE-2025-11091 — High (CVSS 8.8): A security flaw has been discovered in Tenda AC21 up to 16.03.08.16. Affected by this vulnerability is the function…

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