Headline
CVE-2023-33010: Zyxel security advisory for multiple buffer overflow vulnerabilities of firewalls | Zyxel Networks
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.
CVEs: CVE-2023-33009, CVE-2023-33010****Summary
Zyxel has released patches for firewalls affected by multiple buffer overflow vulnerabilities. Users are advised to install them for optimal protection.
What are the vulnerabilities?
CVE-2023-33009
A buffer overflow vulnerability in the notification function in some firewall versions could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and even a remote code execution on an affected device.
CVE-2023-33010
A buffer overflow vulnerability in the ID processing function in some firewall versions could allow an unauthenticated attacker to cause DoS conditions and even a remote code execution on an affected device.
What versions are vulnerable—and what should you do?
After a thorough investigation, we’ve identified the vulnerable firewall series that are within their vulnerability support period and released patches to address the vulnerability, as shown in the table below.
Affected series
Affected version
Patch availability
ATP
ZLD V4.32 to V5.36 Patch 1
ZLD V5.36 Patch 2
USG FLEX
ZLD V4.50 to V5.36 Patch 1
ZLD V5.36 Patch 2
USG FLEX50(W) / USG20(W)-VPN
ZLD V4.25 to V5.36 Patch 1
ZLD V5.36 Patch 2
VPN
ZLD V4.30 to V5.36 Patch 1
ZLD V5.36 Patch 2
ZyWALL/USG
ZLD V4.25 to V4.73 Patch 1
ZLD V4.73 Patch 2
Got a question?
Please contact your local service rep or visit Zyxel’s Community for further information or assistance.
Acknowledgment
Thanks to the following security consultancies:
- Lays and atdog from TRAPA Security, followed by
- STAR Labs SG
Revision history
2023-5-24: Initial release.
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