CVE-2020-35729
CVE-2020-35729 is a critical-severity vulnerability in Klogserver Klog Server with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 88% places it in the 100th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-78.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v2: 10.0
- EPSS exploit prediction: 88% (100th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-78
- Affected product: Klogserver Klog Server
- Published:
- Last modified:
Description
KLog Server 2.4.1 allows OS command injection via shell metacharacters in the actions/authenticate.php user parameter.
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 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2020-35729 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 88% (100th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-35729?
- CVE-2020-35729 affects Klogserver Klog Server. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2020-35729?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2020-35729 published?
- CVE-2020-35729 was published on 2020-12-27 and last updated on 2026-06-17.
References
- http://packetstormsecurity.com/files/160798/Klog-Server-2.4.1-Command-Injection.html
- http://packetstormsecurity.com/files/161123/Klog-Server-2.4.1-Command-Injection.html
- http://packetstormsecurity.com/files/161410/Klog-Server-2.4.1-Command-Injection.html
- https://github.com/mustgundogdu/Research/blob/main/KLOG_SERVER/Exploit_Code
- https://github.com/mustgundogdu/Research/blob/main/KLOG_SERVER/README.md
Affected products (1)
- cpe:2.3:a:klogserver:klog_server:2.4.1:*:*:*:*:*:*:*
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