CVE-2023-33010 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2023-06-05
A buffer overflow vulnerability exists in the ID processing function of multiple Zyxel firewall series. An unauthenticated remote attacker can exploit this to cause a denial-of-service (DoS) condition or achieve remote code execution.
Yes. CVE-2023-33010 is known to be exploited in the wild, first recorded on 5 June 2023. Treat it as urgent.
How severe is CVE-2023-33010?
Critical severity, with a CVSS score of 9.8, published 5 June 2023.
Which products and versions are affected?
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; and 2 more.
Is there a fix for CVE-2023-33010?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2023-33010 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2023-33010?
Check whether you run Zyxel Firewalls or Zyxel Multiple Firewalls. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Affected products
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
Timeline
2023-06-05: disclosed: Vulnerability published and added to CISA KEV catalog
2023-06-05: kev added: Added to CISA Known Exploited Vulnerabilities Catalog