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CVE-2020-35729

91
FAUCET Score

CVE-2020-35729 describes an OS command injection vulnerability in KLog Server 2.4.1, specifically within the actions/authenticate.php user parameter, allowing attackers to execute arbitrary commands. This critical vulnerability, rated 9.8 CVSS, is easily exploitable over the network without authentication and can lead to complete compromise of confidentiality, integrity, and availability. While not listed on CISA's KEV catalog, extensive exploit code is publicly available through Metasploit, Nuclei templates, and ExploitDB, indicating a high potential for exploitation despite limited social media and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
2.4.1CPE matchmatch criteria
cpe:2.3:a:klogserver:klog_server:2.4.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
87.99%
Probability of exploitation in next 30 days
EPSS Percentile
99.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Metasploit: Klog Server authenticate.php user Unauthenticated Command Injection · Dec 27, 2020
Nuclei: CVE-2020-35729 · Feb 26, 2021
ExploitDB: EDB-49474 · Jan 25, 2021
This CVE's current EPSS score of 0.8799 is in the 99th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

packetstormsecurity.com / files/160798/Klog-Server-2.4.1-Command-Injection.html
ExploitThird Party AdvisoryVDB Entry
packetstormsecurity.com / files/161123/Klog-Server-2.4.1-Command-Injection.html
ExploitThird Party AdvisoryVDB Entry
packetstormsecurity.com / files/161410/Klog-Server-2.4.1-Command-Injection.html
ExploitThird Party AdvisoryVDB Entry
github.com / mustgundogdu/Research/blob/main/KLOG_SERVER/Exploit_Code
ExploitThird Party Advisory
github.com / mustgundogdu/Research/blob/main/KLOG_SERVER/README.md
ExploitThird Party Advisory