CVE record · CVE-2023-4397

Buffer overflow in Zyxel ATP series firmware and others

CVSS 4.4 MediumEPSS 0.0023 · 14th percentile

Published by the CVE Program (CNA: Zyxel) at 28 Nov 2023, 01:42 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Zyxel	ATP series firmware	affected 5.37 Other versions: unaffected
Zyxel	USG FLEX series firmware	affected 5.37 Other versions: unaffected
Zyxel	USG FLEX 50(W) series firmware	affected 5.37 Other versions: unaffected
Zyxel	USG20(W)-VPN series firmware	affected 5.37 Other versions: unaffected

Identifiers: CVE-2023-4397
CNA: Zyxel
Weakness (CWE): CWE-120
Tags: Zyxel ATP series firmware
Zyxel USG FLEX series firmware
Zyxel USG FLEX 50(W) series firmware
Zyxel USG20(W)-VPN series firmware
Memory corruption
Published: 28 Nov 2023
Updated: 2 Aug 2024

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
4.4	Medium	3.1	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H	CNA (Zyxel)

CISA KEV Not listed.
EPSS 0.0023, the 14th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 28 Nov 2023. New records show when each source confirmed them.

Sources

References from the CNA

www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps vendor-advisory

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.