Blog reader Liam had alerted me about vulnerability CVE-2023-28771 in Zyxel firewalls via email just a few days ago (thanks for that). An April 25, 2023 post states that improper handling of error messages occurs in Zyxel ZyWALL/USG series firmware versions 4.60 through 4.73, VPN series firmware versions 4.60 through 5.35, USG FLEX series firmware versions 4.60 through 5.35, and ATP series firmware versions 4.60 through 5.35. Zyxel has published the support article Zyxel security advisory for OS command injection vulnerability of firewalls. There you can also find information about which patches are available.
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