CVE-2023-33010
Zyxel Multiple Firewalls Buffer Overflow Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
Required action
Apply updates per vendor instructions.
CISA notes
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-buffer-overflow-vulnerabilities-of-firewalls; https://nvd.nist.gov/vuln/detail/CVE-2023-33010
Description
A buffer overflow vulnerability in the ID processing function in Zyxel ATP series firmware versions 4.32 through 5.36 Patch 1, USG FLEX series firmware versions 4.50 through 5.36 Patch 1, USG FLEX 50(W) firmware versions 4.25 through 5.36 Patch 1, USG20(W)-VPN firmware versions 4.25 through 5.36 Patch 1, VPN series firmware versions 4.30 through 5.36 Patch 1, ZyWALL/USG series firmware versions 4.25 through 4.73 Patch 1, could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and even a remote code execution on an affected device.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HAffected Products
| Vendor | Product | Affected versions |
|---|---|---|
| Zyxel | ATP series firmware | 4.32 through 5.36 Patch 1 |
| Zyxel | USG FLEX series firmware | 4.50 through 5.36 Patch 1 |
| Zyxel | USG FLEX 50(W) firmware | 4.25 through 5.36 Patch 1 |
| Zyxel | USG20(W)-VPN firmware | 4.25 through 5.36 Patch 1 |
| Zyxel | VPN series firmware | 4.30 through 5.36 Patch 1 |
| Zyxel | ZyWALL/USG series firmware | 4.25 through 4.73 Patch 1 |
References
1 LinksRecord Details
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