Actively exploited · Published May 24, 2023 · Assigned by Zyxel
CVE-2023-33010
Critical 9.8 Exploited
In plain English
A critical-severity buffer overflow in ATP series firmware from Zyxel. Attackers are actively exploiting it in the wild (listed by CISA on June 5, 2023). The chance it is exploited in the next 30 days is estimated at 29.0% (higher than 98% of all known vulnerabilities). Apply updates per vendor instructions.
CISA guidance
Apply updates per vendor instructions.
Federal agencies must remediate by Jun 26, 2023.
Official 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.
Affected products (as reported)
| Vendor | Product | 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 |
Weakness: CWE-120 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H