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CVE-2023-33012

HIGH

8.8

CVSS Score

Published: July 17, 2023 at 05:23 PM UTC

Updated: June 17, 2026 at 06:00 AM UTC

46 products affected across 1 vendorUsg Flex 100W FirmwareUSG FLEX 200 firmwareUSG FLEX 700 firmware

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Severity

HIGH8.8

Exploit prediction

EPSS 10%

SSVC

No known exploit

Description

A command injection vulnerability in the configuration parser of the Zyxel ATP series firmware versions 5.10 through 5.36 Patch 2, USG FLEX series firmware versions 5.00 through 5.36 Patch 2, USG FLEX 50(W) series firmware versions 5.10 through 5.36 Patch 2, USG20(W)-VPN series firmware versions 5.10 through 5.36 Patch 2, and VPN series firmware versions 5.00 through 5.36 Patch 2, could allow an unauthenticated, LAN-based attacker to execute some OS commands by using a crafted GRE configuration when the cloud management mode is enabled.

Affected

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

Usg 20W VPN Firmware · Zyxel

95%

5.10 ≤ v < 5.37

Affected range stops below 5.37, so it looks safe — our inference, not a vendor statement

Usg 2200-vpn Firmware · Zyxel

95%

5.00 ≤ v < 5.37

Affected range stops below 5.37, so it looks safe — our inference, not a vendor statement

zyxel-usg-2200-vpn (same device)

Usg Flex 100 Firmware · Zyxel

95%

5.00 ≤ v < 5.37

Affected range stops below 5.37, so it looks safe — our inference, not a vendor statement

zyxel-usg-flex-100 (same device)

Usg Flex 100W Firmware · Zyxel

95%

5.00 ≤ v < 5.37

Affected range stops below 5.37, so it looks safe — our inference, not a vendor statement

zyxel-usg-flex-100w (same device)

USG FLEX 200 firmware · Zyxel

95%

5.00 ≤ v < 5.37

Affected range stops below 5.37, so it looks safe — our inference, not a vendor statement

zyxel-usg-flex-200 (same device)

Usg Flex 50 Firmware · Zyxel

95%

5.00 ≤ v < 5.37

Affected range stops below 5.37, so it looks safe — our inference, not a vendor statement

zyxel-usg-flex-50 (same device)

USG FLEX 500 firmware · Zyxel

95%

5.00 ≤ v < 5.37

Affected range stops below 5.37, so it looks safe — our inference, not a vendor statement

zyxel-usg-flex-500 (same device)

Usg Flex 50W Firmware · Zyxel

95%

5.00 ≤ v < 5.37

Affected range stops below 5.37, so it looks safe — our inference, not a vendor statement

USG FLEX 700 firmware · Zyxel

95%

5.00 ≤ v < 5.37

Affected range stops below 5.37, so it looks safe — our inference, not a vendor statement

zyxel-usg-flex-700 (same device)

Zywall ATP100 Firmware · Zyxel

95%

5.10 ≤ v < 5.37

Affected range stops below 5.37, so it looks safe — our inference, not a vendor statement

zyxel-zywall-atp100 (same device)

Remediation

No guide yet

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

Patch and advisory references

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-wlan-controllers

References (1)

Vendor Advisory

Source: [email protected]

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-wlan-controllers

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHZyxel

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

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-78

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