CVE-2020-35729

Name: CVE-2020-35729
Creator: NVD / NIST
Published: 2020-12-27T05:15:11.683+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 87.99%

Last modified Jun 17, 2026

CVE-2020-35729 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. KLog Server 2.4.1 allows OS command injection via shell metacharacters in the actions/authenticate.php user parameter.. EPSS estimates a 87.99% chance of exploitation in the next 30 days.

Description

KLog Server 2.4.1 allows OS command injection via shell metacharacters in the actions/authenticate.php user parameter.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

87.99%

99.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Klogserver	Klog Server	2.4.1

References

http://packetstormsecurity.com/files/160798/Klog-Server-2.4.1-Command-Injection.htmlExploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/161123/Klog-Server-2.4.1-Command-Injection.htmlExploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/161410/Klog-Server-2.4.1-Command-Injection.htmlExploit, Third Party Advisory, VDB Entry
https://github.com/mustgundogdu/Research/blob/main/KLOG_SERVER/Exploit_CodeExploit, Third Party Advisory
https://github.com/mustgundogdu/Research/blob/main/KLOG_SERVER/README.mdExploit, Third Party Advisory
http://packetstormsecurity.com/files/160798/Klog-Server-2.4.1-Command-Injection.htmlExploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/161123/Klog-Server-2.4.1-Command-Injection.htmlExploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/161410/Klog-Server-2.4.1-Command-Injection.htmlExploit, Third Party Advisory, VDB Entry
https://github.com/mustgundogdu/Research/blob/main/KLOG_SERVER/Exploit_CodeExploit, Third Party Advisory
https://github.com/mustgundogdu/Research/blob/main/KLOG_SERVER/README.mdExploit, Third Party Advisory

Timeline

Published: Dec 27, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-35729?

KLog Server 2.4.1 allows OS command injection via shell metacharacters in the actions/authenticate.php user parameter.

How severe is CVE-2020-35729?

CVE-2020-35729 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 87.99% probability of exploitation in the next 30 days.

How do I fix CVE-2020-35729?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-35729?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST