How severe is CVE-2025-67186?

CVE-2025-67186 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-2025-67186 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-67186?

CVE-2025-67186 affects Totolink A950rg Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-67186?

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-2025-67186 have an EU (EUVD) identifier?

Yes. CVE-2025-67186 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-206718.

When was CVE-2025-67186 published?

CVE-2025-67186 was published on 2026-02-03 and last updated on 2026-06-17.

CVE-2025-67186

CVE-2025-67186 is a critical-severity vulnerability in Totolink A950rg 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-120.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-206718
Weakness: CWE-120
Affected product: Totolink A950rg Firmware
Published: 2026-02-03
Last modified: 2026-06-17

Description

TOTOLINK A950RG V4.1.2cu.5204_B20210112 contains a buffer overflow vulnerability in the setUrlFilterRules interface of /lib/cste_modules/firewall.so. The vulnerability occurs because the `url` parameter is not properly validated for length, allowing remote attackers to trigger a buffer overflow, potentially leading to arbitrary code execution or denial of service.

Frequently asked questions

What is CVE-2025-67186?: TOTOLINK A950RG V4.1.2cu.5204_B20210112 contains a buffer overflow vulnerability in the setUrlFilterRules interface of /lib/cste_modules/firewall.so. The vulnerability occurs because the `url` parameter is not properly validated for length, allowing remote attackers to trigger a buffer overflow, potentially leading to arbitrary code execution or denial of service.
How severe is CVE-2025-67186?: CVE-2025-67186 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-2025-67186 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-67186?: CVE-2025-67186 affects Totolink A950rg Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-67186?: 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-2025-67186 have an EU (EUVD) identifier?: Yes. CVE-2025-67186 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-206718.
When was CVE-2025-67186 published?: CVE-2025-67186 was published on 2026-02-03 and last updated on 2026-06-17.

References

https://github.com/SunnyYANGyaya/cuicuishark-sheep-fishIOT/blob/main/ToTolink/A950RG/5024-setUrlFliterRules-url-buffer.md

Affected products (1)

cpe:2.3:o:totolink:a950rg_firmware:4.1.2cu.5204_b20210112:*:*:*:*:*:*:*

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