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Vulnerability record · CVE-2020-29390 · published 30 November 2020

CVE-2020-29390: Zeroshell os command injection vulnerability

Zeroshell · Zeroshell

Zeroshell 3.9.3 contains a command injection vulnerability in the /cgi-bin/kerbynet StartSessionSubmit parameter that could allow an unauthenticated attacker to execute a system command by using shell metacharacters and the %0a character.

9.8 CVSS 3.1 Critical EPSS 40% · top 1.4% CWE-78 · OS command injection
9.8CVSS 3.1 base score, v2 10.0
40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Zeroshell 3.9.3 contains a command injection vulnerability in the /cgi-bin/kerbynet StartSessionSubmit parameter that could allow an unauthenticated attacker to execute a system command by using shell metacharacters and the %0a character.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://blog.quake.so/post/zeroshell_linux_router_rce/ ExploitThird Party Advisory
https://blog.quake.so/post/zeroshell_linux_router_rce/ ExploitThird Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2020-29390), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.