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CRITICAL severity

CVE-2021-37344 — Nagios Xi Switch Wizard

CRITICAL

CVE-2021-37344 is a critical-severity (CVSS 9.8) OS Command Injection vulnerability in nagios nagios xi switch wizard. EPSS puts its 30-day exploitation probability at 96.8% (100th percentile). A fix is available — see the affected versions and patch details below.

Nagios XI Switch Wizard before version 2.5.7 is vulnerable to remote code execution through improper neutralisation of special elements used in an OS Command (OS Command injection).

Published
Updated
Affected
1 product
Patched
See advisory
Exploits
None indexed
Exploitation data as of Oct 29, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
96.8%probability of exploitation in next 30 days
Very High Risk0.00%
Lower risk than most CVEs100th percentile — riskier than 100% of all scored CVEsHighest risk
43.9%62.6%81.3%100.0%56.1%96.8%Apr 26Sep 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2021-37344 by exploitation likelihood (EPSS) against impact (CVSS). In the shaded patch-first corner (EPSS 50%+, CVSS 7.0+).

Where this sits among everything scored

Of 397,508 CVEs with a current EPSS score, this one falls in the ≥ 90% band (highlighted). Counts from FIRST.org, log-scaled.

Description

Nagios XI Switch Wizard before version 2.5.7 is vulnerable to remote code execution through improper neutralisation of special elements used in an OS Command (OS Command injection).

Affected Products

1 product · 1 configurations
Application
nagios xi switch wizardnagios
< 2.5.7
range

Detection & mitigation playbook

Vendor / appliance

  1. Detect

    Inventory every nagios nagios xi switch wizard deployment and check each version against the affected-products list above.

  2. Fix

    Apply the nagios nagios xi switch wizard security patch or hotfix for CVE-2021-37344 on the affected version, following the vendor advisory for your exact build.

  3. Workarounds

    Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Frequently Asked Questions

Nagios XI Switch Wizard before version 2.5.7 is vulnerable to remote code execution through improper neutralisation of special elements used in an OS Command (OS Command injection).
O3 Security · Runtime Protection

Is CVE-2021-37344 being exploited in your environment?

Detect and block the exploit chain at execution, on systems you cannot patch yet.

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CVE-2021-37344: Nagios Xi Switch Wizard (Critical 9.8)