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Vulnerabilities

Vulnerability · CVE-2021-47903

LiteSpeed Web Server Enterprise 5.4.11 contains an authenticated command injection vulnerability in the external app configuration interface.

Published Jan 23, 2026 · catalog updated Jul 15, 2026 · LiteSpeed Technologies Inc LiteSpeed Web Server Enterprise

Last checked Nov 5, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2021-47903. EPSS is 1.63%. Act only if a listed version of LiteSpeed Technologies Inc LiteSpeed Web Server Enterprise is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.6
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.63%
Remediation
Vendor / distro source
Affected products
vendor LiteSpeed Technologies Inc LiteSpeed Web Server Enterprise 5.4.11

LiteSpeed Web Server Enterprise 5.4.11 contains an authenticated command injection vulnerability in the external app configuration interface. Authenticated administrators can inject shell commands through the 'Command' parameter in the server configuration, allowing remote code execution via path traversal and bash command injection.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor LiteSpeed Technologies Inc LiteSpeed Web Server Enterprise 5.4.115.4.11

How to fix CVE-2021-47903

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2021-47903. EPSS is 1.63%. Act only if a listed version of LiteSpeed Technologies Inc LiteSpeed Web Server Enterprise is installed.

Which versions are affected?

Compare what you have installed with LiteSpeed Technologies Inc LiteSpeed Web Server Enterprise 5.4.11 5.4.11. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 1.63%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 23, 2026 · EUVD

    Detected

    LiteSpeed Web Server Enterprise 5.4.11 contains an authenticated command injection vulnerability in the external app configuration interface. Authenticated administrators can inject shell commands through the 'Command' parameter in the server configuration, allowing remote code execution via path traversal and bash command injection.

  2. Jul 15, 2026 · EUVD

    Updated

    LiteSpeed Web Server Enterprise 5.4.11 contains an authenticated command injection vulnerability in the external app configuration interface. Authenticated administrators can inject shell commands through the 'Command' parameter in the server configuration, allowing remote code execution via path traversal and bash command injection.

Sources

  • CVE.orgVulnerability recordCVE-2021-47903

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-47903

    30-day exploitation probability 1.63%

    first.org
  • EUVDVulnerability recordEUVD-2026-4277

    LiteSpeed Web Server Enterprise 5.4.11 contains an authenticated command injection vulnerability in the external app configuration interface. Authenticated administrators can inject shell commands through the 'Command' parameter in the server configuration, allowing remote code e

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 5, 2026
  • CVE.orgNov 4, 2026
  • EUVDNov 2, 2026