What is CVE-2021-27734?

CVE-2021-27734 is a critical-severity vulnerability in Belden Hirschmann_hios, classified under Improper Authentication. CVSS score: 9.8/10. Published 2021-05-17.

How severe is CVE-2021-27734?

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

Auth bypass in Belden Hirschmann_hios

CVE-2021-27734

Hirschmann HiOS 07.1.01, 07.1.02, and 08.1.00 through 08.5.xx and HiSecOS 03.3.00 through 03.5.01 allow remote attackers to change the credentials of existing users.

Vulnerability class: Broken Authentication

EPSS: 0.013 (66.5th percentile) — read the EPSS interpretation.

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.

Affected products

Belden Hirschmann_hios — versions 07.1.01, 07.1.02
Belden Hisecos
N/a — versions n/a

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

cve@mitre.org (x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2021-27734?: CVE-2021-27734 is a critical-severity vulnerability in Belden Hirschmann_hios, classified under Improper Authentication. CVSS score: 9.8/10. Published 2021-05-17.
How severe is CVE-2021-27734?: Critical severity. CVSS v3 base score is 9.8 out of 10.