What is CVE-2024-42546?

CVE-2024-42546 is a critical-severity vulnerability in Totolink A3100r, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2024-08-12.

How severe is CVE-2024-42546?

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

Buffer overflow in Totolink A3100r

CVE-2024-42546

TOTOLINK A3100R V4.1.2cu.5050_B20200504 has a buffer overflow vulnerability in the password parameter in the loginauth function.

Vulnerability class: Buffer Overflow

Published 2024-08-12 · 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 (48.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

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

Affected products

Totolink A3100r
Totolink A3100r Firmware — versions 4.1.2cu.5050_b20200504

Weakness classification (CWE)

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

References

github.com/noahze01/IoT-vulnerable/blob/main/TOTOLink/A3100R/loginauth_password… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2024-42546?: CVE-2024-42546 is a critical-severity vulnerability in Totolink A3100r, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2024-08-12.
How severe is CVE-2024-42546?: Critical severity. CVSS v3 base score is 9.8 out of 10.