CVE-2020-29390 describes a critical command injection vulnerability in Zeroshell 3.9.3, specifically within the /cgi-bin/kerbynet StartSessionSubmit parameter. An unauthenticated attacker can exploit this by injecting shell metacharacters and the %0a character to execute arbitrary system commands. With a CVSS score of 9.8 (Critical) and an EPSS score indicating high exploitability, this vulnerability poses a significant risk due to its network-based attack vector, low attack complexity, and complete compromise potential (Confidentiality, Integrity, Availability). While not listed in CISA's KEV catalog and lacking Metasploit or ExploitDB entries, Nuclei templates exist, suggesting available exploit code. Community discussion and media coverage are currently minimal.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
3.9.3CPE matchmatch criteria | cpe:2.3:o:zeroshell:zeroshell:3.9.3:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
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 records are not available for this CVE.