A OS command injection vulnerability in the CGI program of Zyxel USG FLEX 100(W) firmware versions 5.00 through 5.21 Patch 1, USG FLEX 200 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 500 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 700 firmware versions 5.00 th
A OS command injection vulnerability in the CGI program of Zyxel USG FLEX 100(W) firmware versions 5.00 through 5.21 Patch 1, USG FLEX 200 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 500 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 700 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 50(W) firmware versions 5.10 through 5.21 Patch 1, USG20(W)-VPN firmware versions 5.10…
| Vendor | Product | Versions |
|---|---|---|
| Zyxel | USG FLEX 100(W) firmware | 5.00 through 5.21 Patch 1 |
| Zyxel | USG FLEX 200 firmware | 5.00 through 5.21 Patch 1 |
| Zyxel | USG FLEX 500 firmware | 5.00 through 5.21 Patch 1 |
| Zyxel | USG FLEX 700 firmware | 5.00 through 5.21 Patch 1 |
| Zyxel | ATP series firmware | 5.10 through 5.21 Patch 1 |
| Zyxel | VPN series firmware | 4.60 through 5.21 Patch 1 |
| Zyxel | USG FLEX 50(W) firmware | 5.10 through 5.21 Patch 1 |
| Zyxel | USG 20(W) | VPN firmware — 5.10 through 5.21 Patch 1 |
Yes — actively exploited. Added to the CISA KEV catalog on 2022-05-16. Ransomware use: Unknown.
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.