AS
Product
ATP series firmware
by Zyxel · last CVE Aug 4, 2026
On CISA KEVExploited in the wildRansomware-linked
49
CVEs
5
On KEV
9.8
Max CVSS
0
New 30D
Severity mix
Critical 7High 24Medium 18Low 0
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CVECVSSEPSSPublishedSummary · affected versions
CVE-2023-6399
6.5
1%
Feb 20
A format string vulnerability in Zyxel ATP series firmware versions from 4.32 through 5.37 Patch 1, USG FLEX series firmware versions from 4.50 through 5.37 Patch 1, USG FLEX…
Affected: version 4.32 through 5.37 Patch 1
CVE-2023-34140
6.5
0%
Jul 17
A buffer overflow vulnerability in the Zyxel ATP series firmware versions 4.32 through 5.36 Patch 2, USG FLEX series firmware versions 4.50 through 5.36 Patch 2, USG FLEX 50(W)…
Affected: 4.32 through 5.36 Patch 2
CVE-2023-22918
6.5
1%
Apr 24
A post-authentication information exposure vulnerability in the CGI program of Zyxel ATP series firmware versions 4.32 through 5.35, USG FLEX series firmware versions 4.50 through…
Affected: 4.32 through 5.35
CVE-2022-2030
6.5
1%
Jul 19
A directory traversal vulnerability caused by specific character sequences within an improperly sanitized URL was identified in some CGI programs of Zyxel USG FLEX 100(W) firmware…
Affected: 4.32 through 5.30
CVE-2022-0910
6.5
1%
May 24
A downgrade from two-factor authentication to one-factor authentication vulnerability in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.32 through 4.71, USG FLEX…
Affected: 4.32 through 5.21
CVE-2024-42061
6.1
0%
Sep 3
A reflected cross-site scripting (XSS) vulnerability in the CGI program "dynamic_script.cgi" of Zyxel ATP series firmware versions from V4.32 through V5.38, USG FLEX series…
Affected: versions V4.32 through V5.38
CVE-2023-35139
6.1
0%
Nov 28
A cross-site scripting (XSS) vulnerability in the CGI program of the Zyxel ATP series firmware versions 5.10 through 5.37, USG FLEX series firmware versions 5.00 through 5.37, USG…
Affected: versions 5.10 through 5.37
CVE-2022-40603
6.1
0%
Dec 6
A cross-site scripting (XSS) vulnerability in the CGI program of Zyxel ZyWALL/USG series firmware versions 4.30 through 4.72, VPN series firmware versions 4.30 through 5.31, USG…
Affected: 4.32 through 5.31
CVE-2022-0734
6.1
9%
May 24
A cross-site scripting vulnerability was identified in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.35 through 4.70, USG FLEX series firmware versions 4.50…
Affected: 4.35 through 5.20
CVE-2023-5797
5.5
0%
Nov 28
An improper privilege management vulnerability in the debug CLI command of the Zyxel ATP series firmware versions 4.32 through 5.37, USG FLEX series firmware versions 4.50 through…
Affected: versions 4.32 through 5.37
CVE-2023-5650
5.5
0%
Nov 28
An improper privilege management vulnerability in the ZySH of the Zyxel ATP series firmware versions 4.32 through 5.37, USG FLEX series firmware versions 4.50 through 5.37, USG…
Affected: versions 4.32 through 5.37
CVE-2023-37926
5.5
0%
Nov 28
A buffer overflow vulnerability in the Zyxel ATP series firmware versions 4.32 through 5.37, USG FLEX series firmware versions 4.50 through 5.37, USG FLEX 50(W) series firmware…
Affected: versions 4.32 through 5.37
CVE-2023-37925
5.5
0%
Nov 28
An improper privilege management vulnerability in the debug CLI command of the Zyxel ATP series firmware versions 4.32 through 5.37, USG FLEX series firmware versions 4.50 through…
Affected: versions 4.32 through 5.37
CVE-2023-35136
5.5
0%
Nov 28
An improper input validation vulnerability in the “Quagga” package of the Zyxel ATP series firmware versions 4.32 through 5.37, USG FLEX series firmware versions 4.50 through…
Affected: versions 4.32 through 5.37
CVE-2023-6397
5.3
0%
Feb 20
A null pointer dereference vulnerability in Zyxel ATP series firmware versions from 4.32 through 5.37 Patch 1 and USG FLEX series firmware versions from 4.50 through 5.37 Patch 1…
Affected: version 4.32 through 5.37 Patch 1
CVE-2024-6343
4.9
1%
Sep 3
A buffer overflow vulnerability in the CGI program of Zyxel ATP series firmware versions from V4.32 through V5.38, USG FLEX series firmware versions from V4.50 through V5.38, USG…
Affected: versions V4.32 through V5.38
CVE-2023-27990
4.8
0%
Apr 24
The cross-site scripting (XSS) vulnerability in Zyxel ATP series firmware versions 4.32 through 5.35, USG FLEX series firmware versions 4.50 through 5.35, USG FLEX 50(W) firmware…
Affected: 4.32 through 5.35
CVE-2023-4397
4.4
0%
Nov 28
A buffer overflow vulnerability in the Zyxel ATP series firmware version 5.37, USG FLEX series firmware version 5.37, USG FLEX 50(W) series firmware version 5.37, and USG20(W)-VPN…
Affected: 5.37
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