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CVE-2020-29299

HIGH

7.2

CVSS Score

Published: December 27, 2020 at 05:51 AM UTC

Updated: June 17, 2026 at 03:11 AM UTC

6 products affected across 1 vendorUSG FLEXZldNsg Firmware

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Severity

HIGH7.2

Exploit prediction

EPSS 2%

Description

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Nsg Firmware · Zyxel

95%

v < 1.331.33 1.33 patch1

Affected range stops below 1.33, so it looks safe — our inference, not a vendor statement

zyxel-nsg (same device)

USG FLEX · Zyxel

95%

All versions

VPN Orchestrator · Zyxel

95%

v < 10.03

Affected range stops below 10.03, so it looks safe — our inference, not a vendor statement

95%

v < 4.39v < 4.55

Affected range stops below 4.39, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.55, so it looks safe — our inference, not a vendor statement

zyxel-atp (environment) · zyxel-usg-flex (environment) · zyxel-usg-flex (same device)

ATP · Zyxeldevice

80%

All versions

NSG · Zyxeldevice

80%

All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCVendor Advisory

Source: [email protected]

https://www.zyxel.com/support/Zyxel-security-advisory-for-command-injection-vulnerability-of-firewalls.shtml

x_refsource_MISCVendor Advisory

Source: [email protected]

https://www.zyxel.com/us/en/support/security_advisories.shtml

CVSS

7.2HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: HIGH
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-77

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