In June 2023, FortiGuard Labs detected the propagation of several DDoS botnets exploiting the Zyxel vulnerability (CVE-2023-28771).
This vulnerability is characterized by a command injection flaw affecting multiple firewall models that could potentially allow an unauthorized attacker to execute arbitrary code by sending a specifically crafted packet to the targeted device. The severity of this flaw, rated 9.8 on the CVSS scoring system, was reported by researchers from TRAPA Security.
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Source: Rortinet