How severe is CVE-2021-47903?

CVE-2021-47903 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-47903 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2021-47903?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2021-47903 have an EU (EUVD) identifier?

Yes. CVE-2021-47903 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4277.

When was CVE-2021-47903 published?

CVE-2021-47903 was published on 2026-01-23 and last updated on 2026-06-17.

CVE-2021-47903

CVE-2021-47903 is a high-severity vulnerability with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v4: 8.6
EPSS exploit prediction: 1% (70th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-4277
Weakness: CWE-78
Published: 2026-01-23
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2021-47903?: 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.
How severe is CVE-2021-47903?: CVE-2021-47903 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-47903 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2021-47903?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2021-47903 have an EU (EUVD) identifier?: Yes. CVE-2021-47903 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4277.
When was CVE-2021-47903 published?: CVE-2021-47903 was published on 2026-01-23 and last updated on 2026-06-17.

References

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