How severe is CVE-2025-3991?

CVE-2025-3991 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-2025-3991 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-3991?

CVE-2025-3991 affects Totolink N150rt Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-3991?

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-2025-3991 have an EU (EUVD) identifier?

Yes. CVE-2025-3991 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-12418.

When was CVE-2025-3991 published?

CVE-2025-3991 was published on 2025-04-28 and last updated on 2026-06-17.

CVE-2025-3991

CVE-2025-3991 is a high-severity vulnerability in Totolink N150rt 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: 8.7
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-12418
Weakness: CWE-120
Affected product: Totolink N150rt Firmware
Published: 2025-04-28
Last modified: 2026-06-17

Description

A vulnerability, which was classified as critical, was found in TOTOLINK N150RT 3.4.0-B20190525. This affects an unknown part of the file /boafrm/formWdsEncrypt. The manipulation of the argument submit-url leads to 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-2025-3991?: A vulnerability, which was classified as critical, was found in TOTOLINK N150RT 3.4.0-B20190525. This affects an unknown part of the file /boafrm/formWdsEncrypt. The manipulation of the argument submit-url leads to 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-2025-3991?: CVE-2025-3991 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-2025-3991 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-3991?: CVE-2025-3991 affects Totolink N150rt Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-3991?: 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-2025-3991 have an EU (EUVD) identifier?: Yes. CVE-2025-3991 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-12418.
When was CVE-2025-3991 published?: CVE-2025-3991 was published on 2025-04-28 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:totolink:n150rt_firmware:3.4.0-b20190525:*:*:*:*:*:*:*

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