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CVE-2022-30525: Zyxel Multiple Firewalls OS Command Injection Vulnerability

CVSS: 10.0v2.0HighKEVAnalyzed
Published 12-05-2022Last modified 21-10-2025
Open JSON

Vulnerability summary

CVE-2022-30525 is a high (CVSS 10.0) OS Command Injection vulnerability in Zyxel Multiple Firewalls. It is known to be exploited: CISA lists it, first on 16-05-2022. EPSS estimates a 99.94% chance of exploitation in the next 30 days, higher than 99.9% of scored vulnerabilities. 5 public exploits are recorded.

Overall risk
90/100
0100
Critical · default modelHow is this calculated?
CVSS score
10.0/10
010
High · v2.0 (NVD)
EPSS score
99.94%
0%100%
Critical · 0.00 pp in 30 days
KEVListedCISA
RansomwareNone recordedNo known use recorded
Public exploits5reference, exploit-database, metasploit

Timeline

  1. 12-05-2022
    PublishedVulnerability first disclosed.
  2. 16-05-2022
    Added to CISA KEVZyxel Multiple Firewalls OS Command Injection Vulnerability
  3. 06-06-2022
    CISA remediation dueApply updates per vendor instructions.
  4. 21-10-2025
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

99.94%

Chance of exploitation in the next 30 days

Percentile

100%

Versus all other CVEs

30-day change

0.00 pp

From 99.94% on 19-09-2026

19-09-202619-10-2026
EPSS score
99.94%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
16-05-2022
Federal due date
06-06-2022

CISA required action

Apply updates per vendor instructions. nvd.nist.gov/vuln/detail/CVE-2022-30525

Public exploits

5 found
  • referenceUnverified

    Exploit Reference (packetstormsecurity.com)

    Maturity: unknown

  • referenceUnverified

    Exploit Reference (packetstormsecurity.com)

    Maturity: unknown

  • referenceUnverified

    Exploit Reference (packetstormsecurity.com)

    Maturity: unknown

Show all 5 exploits
  • exploit-databaseremotehardwareUnverified

    Zyxel USG FLEX 5.21 - OS Command Injection

    Maturity: poc

  • MetasploitMetasploitremoteVerified

    Zyxel Firewall ZTP Unauthenticated Command Injection

    exploit/linux/http/zyxel_ztp_rce

    Maturity: weaponized

Weaknesses

CWE · root cause

Affected systems

Zyxel24 products

1 vendor · 24 products

References

6 links