What is CVE-2021-35029?

CVE-2021-35029 is a critical-severity vulnerability in Zyxel Atp Series Firmware, classified under Improper Authentication. CVSS score: 9.8/10. Published 2021-07-02.

How severe is CVE-2021-35029?

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

Is CVE-2021-35029 known to be exploited?

4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Zyxel Atp Series Firmware

CVE-2021-35029

An authentication bypasss vulnerability in the web-based management interface of Zyxel USG/Zywall series firmware versions 4.35 through 4.64 and USG Flex, ATP, and VPN series firmware versions 4.35 through 5.01, which could allow a remote…

Vulnerability class: Broken Authentication

EPSS: 0.002 (41.4th 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

Zyxel Atp Series Firmware — versions 4.35 through 5.01
Zyxel Usg Flex Series Firmware — versions 4.35 through 5.01
Zyxel Usg/zywall Series Firmware — versions 4.35 through 4.64
Zyxel Vpn Series Firmware — versions 4.35 through 5.01

Weakness classification (CWE)

CWE-287 — Improper Authentication

Public proof-of-concept exploits

References

www.zyxel.com/support/Zyxel_security_advisory_for_attacks_against_security_appl… (x_refsource_MISC)

Frequently asked questions

What is CVE-2021-35029?: CVE-2021-35029 is a critical-severity vulnerability in Zyxel Atp Series Firmware, classified under Improper Authentication. CVSS score: 9.8/10. Published 2021-07-02.
How severe is CVE-2021-35029?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-35029 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.