CVE-2020-29390

Name: CVE-2020-29390
Creator: NVD / NIST
Published: 2020-11-30T18:15:11.61+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 36.67%

Last modified Jun 17, 2026

CVE-2020-29390 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 36.67% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

36.67%

98.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Zeroshell	Zeroshell	3.9.3

References

https://blog.quake.so/post/zeroshell_linux_router_rce/Exploit, Third Party Advisory
https://blog.quake.so/post/zeroshell_linux_router_rce/Exploit, Third Party Advisory

Timeline

Published: Nov 30, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-29390?

How severe is CVE-2020-29390?

CVE-2020-29390 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 36.67% probability of exploitation in the next 30 days.

How do I fix CVE-2020-29390?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-29390?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST