Vulnerability Monitor

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CVE-2020-29299

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.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 7.2, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), and availability (service disruption) for affected systems. Impacting 7 products from zyxel, from zyxel, from zyxel and 4 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2020, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2020-12-27T06:15:12.447

Last Modified

2024-11-21T05:23:53.157

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.2 (HIGH)

CVSSv2 Vector

AV:N/AC:L/Au:S/C:C/I:C/A:C

Access Vector: NETWORK
Access Complexity: LOW
Authentication: SINGLE
Confidentiality Impact: COMPLETE
Integrity Impact: COMPLETE
Availability Impact: COMPLETE

Exploitability Score

8.0

Impact Score

10.0

Weaknesses

Type: Primary
CWE-77

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	zyxel	vpn_orchestrator	< 10.03	Yes
Operating System	zyxel	zld	< 4.39	Yes
Operating System	zyxel	zld	< 4.55	Yes
Hardware	zyxel	usg_flex	-	No
Operating System	zyxel	zld	< 4.55	Yes
Hardware	zyxel	atp	-	No
Operating System	zyxel	nsg_firmware	< 1.33	Yes
Operating System	zyxel	nsg_firmware	1.33	Yes
Operating System	zyxel	nsg_firmware	1.33	Yes
Hardware	zyxel	nsg	-	No
Operating System	zyxel	usg_flex_firmware	-	Yes
Operating System	zyxel	zld	< 4.39	Yes
Hardware	zyxel	usg_flex	-	No

References

https://www.zyxel.com/support/Zyxel-security-advisory-for-command-injection-vulnerability-of-firewalls.shtml Vendor Advisory ([email protected])
https://www.zyxel.com/us/en/support/security_advisories.shtml Vendor Advisory ([email protected])
https://www.zyxel.com/support/Zyxel-security-advisory-for-command-injection-vulnerability-of-firewalls.shtml Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.zyxel.com/us/en/support/security_advisories.shtml Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For zyxel's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.