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Public proof of concept

CVE-2020-35729

A public proof of concept exists; no exploitation attested.

  • Published2020-12-27
  • WeaknessCWE-78

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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

Timeline

dates in UTC
  1. 2020-12-2705:15CVE publishedNVD
  2. 2021-01-05Exploit-DB entryExploit-DB

Observed activity

isMalicious corpus · updated 2026-11-04 09:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-35729?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-35729?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Klogserver klog server
BranchAffectedFixed in
2.4= 2.4.1no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

No fix published by the sources we read yet. NVD record

Detection

read 2026-11-03 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
EDB-49366EDB-49474
Exploit-DB
Proof-of-concept repositories
1 repository, unverifiedAl1ex/CVE-2020-35729
PoC-in-GitHub
Metasploit modules
1 moduleexploit/linux/http/klog_server_authenticate_user_unauth_command_injectionrank: excellentModule metadata: Metasploit Framework, © Rapid7, Inc., BSD-3-Clause.
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2020-12-27
Last Modified
2026-06-17
NVD 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.

Is CVE-2020-35729 actively exploited?

Active exploitation of CVE-2020-35729 has not been confirmed. Its EPSS score was 88.1% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-35729?

CVE-2020-35729 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record