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CVE-2023-33010 is a buffer overflow vulnerability in the ID processing function of multiple Zyxel firewall and VPN product lines. Affected products include 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, and ZyWALL/USG series firmware versions 4.25 through 4.73 Patch 1. The flaw can be triggered by crafted input processed by the vulnerable ID handling logic, leading to memory corruption. Available reporting indicates the issue is exploitable without authentication and may result in denial of service or remote code execution on the affected device.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Known vulnerability in Zyxel firmware referenced as part of the actor’s CVE research and targeting of edge devices.
A critical buffer overflow vulnerability in Zyxel firewalls that can lead to denial of service and remote code execution.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.