Security News > 2023 > May > Zyxel warns of critical vulnerabilities in firewall and VPN devices
Zyxel is warning customers of two critical-severity vulnerabilities in several of its firewall and VPN products that attackers could leverage without authentication.
CVE-2023-33009: A buffer overflow vulnerability in the notification function in some Zyxel products, allowing an unauthenticated attacker to perform remote code execution or impose DoS conditions.
CVE-2023-33010: A buffer overflow vulnerability in the ID processing function in some Zyxel products, allowing an unauthenticated attacker to perform remote code execution or impose DoS conditions.
Threat actors keep a watchful eye on any critical flaws that impact such devices as they could facilitate easy access to corporate networks.
Last week, cybersecurity researcher Kevin Beaumont reported that a command injection flaw that Zyxel fixed in April is actively exploited and it impacts the same firewall and VPN products as this time.
Last year, CISA published a warning about hackers leveraging a remote code execution flaw in Zyxel firewall and VPN devices, urging system administrators to apply the firmware patches as soon as possible.
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Related Vulnerability
| DATE | CVE | VULNERABILITY TITLE | RISK |
|---|---|---|---|
| 2023-05-24 | CVE-2023-33010 | Classic Buffer Overflow vulnerability in Zyxel products 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. | 9.8 |
| 2023-05-24 | CVE-2023-33009 | Classic Buffer Overflow vulnerability in Zyxel products A buffer overflow vulnerability in the notification function in Zyxel ATP series firmware versions 4.60 through 5.36 Patch 1, USG FLEX series firmware versions 4.60 through 5.36 Patch 1, USG FLEX 50(W) firmware versions 4.60 through 5.36 Patch 1, USG20(W)-VPN firmware versions 4.60 through 5.36 Patch 1, VPN series firmware versions 4.60 through 5.36 Patch 1, ZyWALL/USG series firmware versions 4.60 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. | 9.8 |