Zld
CVE-2020-29299
HIGH
Severity by source
AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
1DescriptionNVD
Certain Zyxel products allow command injection by an admin via an input string to chg_exp_pwd during a password-change action. This affects VPN On-premise before ZLD V4.39 week38, VPN Orchestrator before SD-OS V10.03 week32, USG before ZLD V4.39 week38, USG FLEX before ZLD V4.55 week38, ATP before ZLD V4.55 week38, and NSG before 1.33 patch 4.
AnalysisAI
Certain Zyxel products allow command injection by an admin via an input string to chg_exp_pwd during a password-change action. Rated high severity (CVSS 7.2), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.
Technical ContextAI
This vulnerability is classified as Command Injection (CWE-77), which allows attackers to inject arbitrary commands into system command execution. Certain Zyxel products allow command injection by an admin via an input string to chg_exp_pwd during a password-change action. This affects VPN On-premise before ZLD V4.39 week38, VPN Orchestrator before SD-OS V10.03 week32, USG before ZLD V4.39 week38, USG FLEX before ZLD V4.55 week38, ATP before ZLD V4.55 week38, and NSG before 1.33 patch 4. Affected products include: Zyxel Vpn Orchestrator, Zyxel Zld, Zyxel Nsg Firmware, Zyxel Usg Flex Firmware. Version information: before 1.33.
RemediationAI
No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Use parameterized APIs, avoid shell execution, validate input with strict allowlists.
A directory traversal vulnerability in the web management interface of Zyxel ATP series firmware versions V5.00 through
A stack-based buffer overflow in fbwifi_continue.cgi on Zyxel UTM and VPN series of gateways running firmware version V4
A command injection vulnerability in the IPSec VPN feature of Zyxel ATP series firmware versions from V4.32 through V5.3
A null pointer dereference vulnerability in Zyxel ATP series firmware versions from V4.32 through V5.38, USG FLEX series
An integer overflow vulnerability in the source code of the QuickSec IPSec toolkit used in the VPN feature of the Zyxel
A post-authentication command injection vulnerability in Zyxel ATP series firmware versions from V4.60 through V5.38 and
A post-authentication command injection vulnerability in Zyxel ATP series firmware versions from V4.32 through V5.38, US
A post-authentication command injection vulnerability in Zyxel ATP series firmware versions from V5.00 through V5.38, US
A reflected cross-site scripting (XSS) vulnerability in the CGI program "dynamic_script.cgi" of Zyxel ATP series firmwar
A cross-site scripting (XSS) vulnerability in the CGI program of the Zyxel ATP series firmware versions 5.10 through 5.3
An improper privilege management vulnerability in the hotspot feature of the Zyxel USG FLEX series firmware versions 4.5
An improper privilege management vulnerability in the debug CLI command of the Zyxel ATP series firmware versions 4.32 t
Same weakness CWE-77 – Command Injection
View allSame technique Command Injection
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External POC / Exploit Code
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