What is CVE-2025-22900?

CVE-2025-22900 is a critical-severity vulnerability in Totolink N600r, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2025-04-15.

How severe is CVE-2025-22900?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Totolink N600r

CVE-2025-22900

Totolink N600R v4.3.0cu.7647_B20210106 was discovered to contain a stack overflow via the macCloneMac parameter in the setWanConfig function.

Vulnerability class: Buffer Overflow

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

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (44.1th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.000

Affected products

Totolink N600r
Totolink N600r Firmware — versions 4.3.0cu.7647_b20210106

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

github.com/xyqer1/TOTOLINK-N600R-setWanConfig-StackOverflow (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2025-22900?: CVE-2025-22900 is a critical-severity vulnerability in Totolink N600r, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2025-04-15.
How severe is CVE-2025-22900?: Critical severity. CVSS v3 base score is 9.8 out of 10.