What is CVE-2025-45866?

CVE-2025-45866 is a medium-severity vulnerability in Totolink A3002r, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.4/10. Published 2025-05-13.

How severe is CVE-2025-45866?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Buffer overflow in Totolink A3002r

CVE-2025-45866

TOTOLINK A3002R v4.0.0-B20230531.1404 was discovered to contain a buffer overflow via the addrPoolEnd parameter in the formDhcpv6s interface.

Vulnerability class: Buffer Overflow

Published 2025-05-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (25.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 25.7% 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 A3002r
Totolink A3002r Firmware — versions 4.0.0-b20230531.1404

Weakness classification (CWE)

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

References

www.totolink.net/home/menu/detail/menu_listtpl/download/id/258/ids/36.html (Product)
github.com/Jiangxiazhe/IOT_hack/blob/main/TOTOLINK/A3002R/9/overflow.md (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2025-45866?: CVE-2025-45866 is a medium-severity vulnerability in Totolink A3002r, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.4/10. Published 2025-05-13.
How severe is CVE-2025-45866?: Medium severity. CVSS v3 base score is 5.4 out of 10.