What is the CVSS score of CVE-2021-47903?

CVE-2021-47903 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.3%.

Is there a public PoC exploit available for CVE-2021-47903?

Yes, a public proof-of-concept exploit is available for CVE-2021-47903. Prioritise patching immediately. EPSS: 0.3%.

How to fix or mitigate CVE-2021-47903?

Within 24 hours: Audit all user accounts with LiteSpeed admin access and review recent authentication logs for suspicious activity. Within 7 days: Implement network segmentation to restrict admin interface access to trusted IP ranges only, and deploy WAF rules to detect command injection patterns in configuration requests. Within 30 days: Contact LiteSpeed for patch availability timeline; if unavailable, evaluate migration to patched version or alternative web server solutions.

CVE-2021-47903

HIGH

OS Command Injection (CWE-78)

2026-01-23 disclosure@vulncheck.com

RCE Path Traversal Command Injection

8.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.8 HIGH

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Jan 26, 2026 - 15:03 vuln.today

Public exploit code

CVE Published

Jan 23, 2026 - 17:16 nvd

HIGH 8.8

DescriptionCVE.org

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.

AnalysisAI

LiteSpeed Web Server Enterprise 5.4.11 contains an authenticated command injection vulnerability in the external app configuration interface. [CVSS 8.8 HIGH]

Technical ContextAI

Classified as CWE-78 (OS Command Injection). 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.

Affected ProductsAI

Component: external app configuration.

RemediationAI

Monitor vendor advisories for a patch. Validate and sanitize file path inputs. Use allowlists. Restrict network access to the affected service where possible.

CVE-2021-47903 vulnerability details – vuln.today

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CVE-2021-47903

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

Affected ProductsAI

RemediationAI

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External POC / Exploit Code