A format string vulnerability in the Zyxel ATP series firmware versions 5.10 through 5.36 Patch 2, USG FLEX series firmware versions 5.00 through 5.36 Patch 2, USG FLEX 50(W) series firmware versions 5.10 through 5.36 Patch 2, USG20(W)-VPN series firmware versions 5.10 through 5.
A format string vulnerability in the Zyxel ATP series firmware versions 5.10 through 5.36 Patch 2, USG FLEX series firmware versions 5.00 through 5.36 Patch 2, USG FLEX 50(W) series firmware versions 5.10 through 5.36 Patch 2, USG20(W)-VPN series firmware versions 5.10 through 5.36 Patch 2, and VPN series firmware versions 5.00 through 5.36 Patch 2, could allow an unauthenticated, LAN-based…
| Vendor | Product | Versions |
|---|---|---|
| Zyxel | ATP series firmware | 5.10 through 5.36 Patch 2 |
| Zyxel | USG FLEX series firmware | 5.00 through 5.36 Patch 2 |
| Zyxel | USG FLEX 50(W) series firmware | 5.10 through 5.36 Patch 2 |
| Zyxel | USG20(W) | VPN series firmware — 5.10 through 5.36 Patch 2 |
| Zyxel | VPN series firmware | 5.00 through 5.36 Patch 2 |
Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
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No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.