How severe is CVE-2025-28256?

CVE-2025-28256 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-2025-28256 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-28256?

CVE-2025-28256 affects Totolink A3100r Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-28256?

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-2025-28256 have an EU (EUVD) identifier?

Yes. CVE-2025-28256 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-8661.

When was CVE-2025-28256 published?

CVE-2025-28256 was published on 2025-03-28 and last updated on 2026-06-17.

CVE-2025-28256

CVE-2025-28256 is a critical-severity vulnerability in Totolink A3100r 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-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-8661
Weakness: CWE-78
Affected product: Totolink A3100r Firmware
Published: 2025-03-28
Last modified: 2026-06-17

Description

An issue in TOTOLINK A3100R V4.1.2cu.5247_B20211129 allows a remote attacker to execute arbitrary code via the setWebWlanIdx of the file /lib/cste_modules/wireless.so.

Frequently asked questions

What is CVE-2025-28256?: An issue in TOTOLINK A3100R V4.1.2cu.5247_B20211129 allows a remote attacker to execute arbitrary code via the setWebWlanIdx of the file /lib/cste_modules/wireless.so.
How severe is CVE-2025-28256?: CVE-2025-28256 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-2025-28256 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-28256?: CVE-2025-28256 affects Totolink A3100r Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-28256?: 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-2025-28256 have an EU (EUVD) identifier?: Yes. CVE-2025-28256 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-8661.
When was CVE-2025-28256 published?: CVE-2025-28256 was published on 2025-03-28 and last updated on 2026-06-17.

References

https://github.com/ZackSecurity/VulnerReport/blob/cve/totolink/A3100R/1.md

Affected products (1)

cpe:2.3:o:totolink:a3100r_firmware:4.1.2cu.5247_b20211129:*:*:*:*:*:*:*

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