What is CVE-2021-35979?

CVE-2021-35979 is a high-severity vulnerability in Digi 6350-Sr, classified under Missing Authentication for Critical Function. CVSS score: 8.1/10. Published 2021-10-08.

How severe is CVE-2021-35979?

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

Auth bypass in Digi 6350-Sr

CVE-2021-35979

An issue was discovered in Digi RealPort through 4.8.488.0. The 'encrypted' mode is vulnerable to man-in-the-middle attacks and does not perform authentication.

Vulnerability class: Broken Authentication

Published 2021-10-08 · last modified 2026-06-17.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.009 (57.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.7% 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-306 — Missing Authentication for Critical Function

References

raw.githubusercontent.com/reidmefirst/vuln-disclosure/main/2021-02.txt (Third Party Advisory)

Frequently asked questions

What is CVE-2021-35979?: CVE-2021-35979 is a high-severity vulnerability in Digi 6350-Sr, classified under Missing Authentication for Critical Function. CVSS score: 8.1/10. Published 2021-10-08.
How severe is CVE-2021-35979?: High severity. CVSS v3 base score is 8.1 out of 10.