CVE-2020-35729
KLog Server 2.4.1 allows OS command injection via shell metacharacters in the actions...
CVE-2020-35729 is a critical vulnerability (CVSS 9.8) in Klogserver Klog Server, published December 27, 2020. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 88.1%, the 99th percentile. No source names a fixed version.
- Severity
- 9.8 CriticalCVSS 3.1, NVD
- Exploit chance
- 88.1%EPSS, 99th percentile
- Exploitation
- None known5 public exploits
- Fixed in
- No fix listedNo source names one
Description
KLog Server 2.4.1 allows OS command injection via shell metacharacters in the actions/authenticate.php user parameter.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Metasploit | Klog Server authenticate.php user Unauthenticated Command Injection | 2020-12-27 |
| Exploit-DB | Klog Server 2.4.1 - Command Injection (Unauthenticated) | 2021-01-05 |
| Exploit-DB | Klog Server 2.4.1 - Unauthenticated Command Injection (Metasploit) | 2021-01-25 |
| PoC in GitHub | Al1ex/CVE-2020-35729 | 2021-04-09 |
| Nuclei | Klog Server <=2.41 - Unauthenticated Command Injection |
What each source reports
NVD Score used
KLog Server 2.4.1 allows OS command injection via shell metacharacters in the actions/authenticate.php user parameter.
- Record
CVE-2020-35729- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 10.0 High
AV:N/AC:L/Au:N/C:C/I:C/A:C - Weakness
- CWE-78
- Updated
- 2026-11-02
CVE ListNo score
KLog Server 2.4.1 allows OS command injection via shell metacharacters in the actions/authenticate.php user parameter.
- Record
CVE-2020-35729- Updated
- 2026-11-02
EUVDEUVD-2020-23385No score
KLog Server 2.4.1 allows OS command injection via shell metacharacters in the actions/authenticate.php user parameter.
- Record
EUVD-2020-23385- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-w4v7-6457-x826No score
KLog Server 2.4.1 allows OS command injection via shell metacharacters in the actions...
KLog Server 2.4.1 allows OS command injection via shell metacharacters in the actions/authenticate.php user parameter.
- Record
GHSA-w4v7-6457-x826- Weakness
- CWE-78
- Updated
- 2026-11-02
History
| Recorded | Changed | Sources |
|---|---|---|
| exploits, facts | ||
| aliases | EUVD | |
| first indexed | CVE List, Exploit-DB, GitHub Advisories, Metasploit, Nuclei, NVD, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
References
github.com/mustgundogdu/Research/blob/main/KLOG_SERVER/README.md
packetstormsecurity.com/files/160798/Klog-Server-2.4.1-Command-Injection.html
nvd.nist.gov/vuln/detail/CVE-2020-35729