What is CVE-2025-28136?

CVE-2025-28136 is a medium-severity vulnerability in Totolink A800r, classified under Stack-based Buffer Overflow. CVSS score: 6.5/10. Published 2025-04-15.

How severe is CVE-2025-28136?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Buffer overflow in Totolink A800r

CVE-2025-28136

TOTOLINK A800R V4.1.2cu.5137_B20200730 was found to contain a buffer overflow vulnerability in the downloadFile.cgi.

Vulnerability class: Buffer Overflow

Published 2025-04-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (20.9th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 20.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

Totolink A800r
Totolink A800r Firmware — versions 4.1.2cu.5137_b20200730

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

sudsy-eyeliner-a59.notion.site/BufferOverflow-V4-1-2cu-5137_B20200730-19872b8cd… (Third Party Advisory)
github.com/Zerone0x00/CVE/blob/main/TOTOLINK/CVE-2025-28136.md (Third Party Advisory)

Frequently asked questions

What is CVE-2025-28136?: CVE-2025-28136 is a medium-severity vulnerability in Totolink A800r, classified under Stack-based Buffer Overflow. CVSS score: 6.5/10. Published 2025-04-15.
How severe is CVE-2025-28136?: Medium severity. CVSS v3 base score is 6.5 out of 10.