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Vulnerability record · CVE-2021-3317 · published 26 January 2021

CVE-2021-3317: Klogserver klog server os command injection vulnerability

Klogserver · Klog Server

KLog Server through 2.4.1 allows authenticated command injection. async.php calls shell_exec() on the original value of the source parameter.

8.8 CVSS 3.1 High EPSS 41% · top 1.4% CWE-78 · OS command injection
8.8CVSS 3.1 base score, v2 6.5
41%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

KLog Server through 2.4.1 allows authenticated command injection. async.php calls shell_exec() on the original value of the source parameter.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/161208/Klog-Server-2.4.1-Command-Injection.html ExploitThird Party Advisory
https://docs.unsafe-inline.com/0day/klog-server-authenticated-command-injection ExploitThird Party Advisory
http://packetstormsecurity.com/files/161208/Klog-Server-2.4.1-Command-Injection.html ExploitThird Party Advisory
https://docs.unsafe-inline.com/0day/klog-server-authenticated-command-injection ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-3317), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.