Improper input validation in Zyxel Atp100

CVE-2022-26531

Multiple improper input validation flaws were identified in some CLI commands of Zyxel USG/ZyWALL series firmware versions 4.09 through 4.71, USG FLEX series firmware versions 4.50 through 5.21, ATP series firmware versions 4.32 through 5.21, VPN series firmware versions 4.30 through 5.21, NSG series firmware versions 1.00 through 1.33 Patch 4, NXC2500 firmware version 6.10(AAIG.3) and earlier versions, NAP203 firmware version 6.25(ABFA.7) and earlier versions, NWA50AX firmware version 6.25(ABYW.5) and earlier versions, WAC500 firmware version 6.30(ABVS.2) and earlier versions, and WAX510D firmware version 6.30(ABTF.2) and earlier versions, that could allow a local authenticated attacker to cause a buffer overflow or a system crash via a crafted payload.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H.

EPSS exploit prediction

EPSS: 0.062 (93.5th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 93.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2022-26531: rose from 0.057 to 0.062.

EPSS over last 30 days · oldest: 0.057 · newest: 0.062 · change: +0.005

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2022-26531?
CVE-2022-26531 is a medium-severity vulnerability in Zyxel Atp100, classified under Improper Input Validation. CVSS score: 6.1/10. Published 2022-05-24.
How severe is CVE-2022-26531?
Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2022-26531 known to be exploited?
4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.