What is CVE-2021-35067?

CVE-2021-35067 is a high-severity vulnerability in Meross Msg100, classified under Authentication Bypass by Capture-replay. CVSS score: 8.1/10. Published 2021-10-07.

How severe is CVE-2021-35067?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Meross Msg100

CVE-2021-35067

Meross MSG100 devices before 3.2.3 allow an attacker to replay the same data or similar data (e.g., an attacker who sniffs a Close message can transmit an acceptable Open message).

Published 2021-10-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.009 (60.5th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 60.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-294 — Authentication Bypass by Capture-replay

References

infosec.rm-it.de/ (Exploit, Third Party Advisory)
infosec.rm-it.de/2021/06/18/meross-smart-wi-fi-garage-door-opener-analysis/ (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-35067?: CVE-2021-35067 is a high-severity vulnerability in Meross Msg100, classified under Authentication Bypass by Capture-replay. CVSS score: 8.1/10. Published 2021-10-07.
How severe is CVE-2021-35067?: High severity. CVSS v3 base score is 8.1 out of 10.