What is CVE-2025-28018?

CVE-2025-28018 is a high-severity vulnerability in Totolink A800r, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.3/10. Published 2025-04-23.

How severe is CVE-2025-28018?

High severity. CVSS v3 base score is 7.3 out of 10.

Is CVE-2025-28018 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Totolink A800r

CVE-2025-28018

TOTOLINK A800R V4.1.2cu.5137_B20200730 was found to contain a buffer overflow vulnerability in downloadFile.cgi through the v14 parameter.

Vulnerability class: Buffer Overflow

Published 2025-04-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.004 (33.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 33.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

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

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

Lunax0/CVE_

References

locrian-lightning-dc7.notion.site/BufferOverflow2-1948e5e2b1a28070a8d1d1ba725fe… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2025-28018?: CVE-2025-28018 is a high-severity vulnerability in Totolink A800r, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.3/10. Published 2025-04-23.
How severe is CVE-2025-28018?: High severity. CVSS v3 base score is 7.3 out of 10.
Is CVE-2025-28018 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.