How severe is CVE-2025-28135?

CVE-2025-28135 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-28135 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-28135?

CVE-2025-28135 affects Totolink A810r Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-28135?

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-2025-28135 have an EU (EUVD) identifier?

Yes. CVE-2025-28135 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-8648.

When was CVE-2025-28135 published?

CVE-2025-28135 was published on 2025-03-27 and last updated on 2026-06-17.

CVE-2025-28135

CVE-2025-28135 is a high-severity vulnerability in Totolink A810r Firmware with a CVSS 3.x base score of 7.5. 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-121.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (39th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-8648
Weakness: CWE-121
Affected product: Totolink A810r Firmware
Published: 2025-03-27
Last modified: 2026-06-17

Description

TOTOLINK A810R V4.1.2cu.5182_B20201026 was found to contain a buffer overflow vulnerability in downloadFile.cgi.

Frequently asked questions

What is CVE-2025-28135?: TOTOLINK A810R V4.1.2cu.5182_B20201026 was found to contain a buffer overflow vulnerability in downloadFile.cgi.
How severe is CVE-2025-28135?: CVE-2025-28135 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-28135 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-28135?: CVE-2025-28135 affects Totolink A810r Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-28135?: 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-2025-28135 have an EU (EUVD) identifier?: Yes. CVE-2025-28135 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-8648.
When was CVE-2025-28135 published?: CVE-2025-28135 was published on 2025-03-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:totolink:a810r_firmware:4.1.2cu.5182_b20201026:*:*:*:*:*:*:*

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CVE-2025-28037 — Critical (CVSS 9.8): TOTOLINK A810R V4.1.2cu.5182_B20201026 and A950RG V4.1.2cu.5161_B20200903 were found to contain a pre-auth remote…
CVE-2025-28024 — Critical (CVSS 9.8): TOTOLINK A810R V4.1.2cu.5182_B20201026 was found to contain a buffer overflow vulnerability in the cstecgi.cgi
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CVE-2025-28137 — Critical (CVSS 9.8): The TOTOLINK A810R V4.1.2cu.5182_B20201026 were found to contain a pre-auth remote command execution vulnerability in…

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