CVE-2020-29390
CVE-2020-29390 is a critical-severity vulnerability in Zeroshell with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 37% places it in the 98th 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: 37% (98th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-78
- Affected product: Zeroshell
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2020-29390?
- 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.
- How severe is CVE-2020-29390?
- CVE-2020-29390 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-2020-29390 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 37% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-29390?
- CVE-2020-29390 affects Zeroshell. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2020-29390?
- 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-2020-29390 published?
- CVE-2020-29390 was published on 2020-11-30 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:o:zeroshell:zeroshell:3.9.3:*:*:*:*:*:*:*
More vulnerabilities in Zeroshell
- CVE-2009-0545 — Critical (CVSS 10.0): cgi-bin/kerbynet in ZeroShell 1.0beta11 and earlier allows remote attackers to execute arbitrary commands via shell…
- CVE-2019-12725 — Critical (CVSS 9.8): Zeroshell 3.9.0 is prone to a remote command execution vulnerability. Specifically, this issue occurs because the web…
- CVE-2021-41738 — High (CVSS 8.8): ZeroShell 3.9.5 has a command injection vulnerability in /cgi-bin/kerbynet IP parameter, which may allow an…
All CVEs affecting Zeroshell →
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