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Fencer Vulns
critical 9.8

CVE-2022-30525 kev in the critical feed json

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…

published 2022-05-12 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-52385

cvss
9.8
version 3.1, CNA
cisa kev
Exploited
added 2022-05-16
epss
99.9%
EPSS 99.9% chance of exploitation in 30 days, percentile 99.9%
public exploits
2
Metasploit, Exploit-DB, plus a Nuclei check

Summary

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 through 5.21 Patch 1, ATP series firmware versions 5.10 through 5.21 Patch 1, VPN series firmware versions 4.60 through 5.21 Patch 1, which could allow an attacker to modify specific files and then execute some OS commands on a vulnerable device.

Patch / fix

cisa required action Apply updates per vendor instructions.

  • zyxel usg_flex_100w_firmware 5.30
  • zyxel usg_flex_200_firmware 5.30
  • zyxel usg_flex_700_firmware 5.30
  • zyxel vpn100_firmware 5.30
  • zyxel vpn1000_firmware 5.30
  • zyxel vpn300_firmware 5.30
  • zyxel vpn50_firmware 5.30
  • zyxel atp100_firmware 5.30
  • zyxel atp100w_firmware 5.30
  • zyxel atp200_firmware 5.30
  • zyxel atp500_firmware 5.30
  • zyxel atp700_firmware 5.30
  • zyxel atp800_firmware 5.30
  • zyxel usg_flex_50w_firmware 5.30
  • zyxel usg20w-vpn_firmware 5.30

Timeline

  1. First public exploit (Metasploit exploit/linux/http/zyxel_ztp_rce)
  2. Published
  3. Added to CISA KEV
  4. CISA patch deadline
  5. CISA SSVC: exploitation active

Known exploited

Added
4 y ago
Patch by
2022-06-06 (4 y ago)
Ransomware
Not known
Required action
Apply updates per vendor instructions.
Vendor, product
Zyxel, Multiple Firewalls
CISA name
Zyxel Multiple Firewalls OS Command Injection Vulnerability

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
yes
Technical impact
total
Assessed
21 mo ago

Exploit prediction

99.94% chance of exploitation in the next 30 days, higher than 99.9% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Metasploit exploit/linux/http/zyxel_ztp_rce Zyxel Firewall ZTP Unauthenticated Command Injection metasploit exploit, excellent rank, 2022-04-28
  • EDB-50946 Zyxel USG FLEX 5.21 - OS Command Injection remote, 2022-06-03
  • Nuclei template Zyxel Firewall - OS Command Injection nuclei detection template
  • packetstormsecurity.com http://packetstormsecurity.com/files/167182/Zyxel-Firewall-ZTP-Unauthenticated-Command-Injection.html referenced PoC, tagged "exploit" by a source, unverified
  • packetstormsecurity.com http://packetstormsecurity.com/files/167372/Zyxel-USG-FLEX-5.21-Command-Injection.html referenced PoC, tagged "exploit" by a source, unverified
  • packetstormsecurity.com http://packetstormsecurity.com/files/168202/Zyxel-Firewall-SUID-Binary-Privilege-Escalation.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

Affected products

  • Zyxel USG FLEX 100(W) firmware
  • Zyxel USG FLEX 200 firmware
  • Zyxel USG FLEX 500 firmware
  • Zyxel USG FLEX 700 firmware
  • Zyxel ATP series firmware
  • Zyxel VPN series firmware
  • Zyxel USG FLEX 50(W) firmware
  • Zyxel USG 20(W)-VPN firmware

Classification

Weakness
  • CWE-78 Improper Neutralization of Special Elements used in an OS Command

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.