CVE-2009-0545
CriticalExploitedPublic exploitcgi-bin/kerbynet in ZeroShell 1.0beta11 and earlier allows remote attackers to execute arbitrary commands via shell metacharacters in the type parameter in a NoAuthREQ x509List action.
Published Feb 12, 2009 · Updated Apr 22, 2026
Key Facts
Patch immediately- CVE-2009-0545 is a critical-severity vulnerability (CVSS 10.0 v2) affecting Zeroshell.
- It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Jun 13, 2019. Public exploit code is available.
- EPSS estimates a 90% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v2
10.0
AV:N/AC:L/Au:N/C:C/I:C/A:C
EPSS (30-day exploit likelihood)
90%
Higher than 99.8% of all scored CVEs
Exploited in the wild
Yes
2 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
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Description
cgi-bin/kerbynet in ZeroShell 1.0beta11 and earlier allows remote attackers to execute arbitrary commands via shell metacharacters in the type parameter in a NoAuthREQ x509List action.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Jun 13, 2019 | n/a | Not reported |
| CIRCL KEV | Oct 14, 2023 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
11 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| ZeroshellZeroshell | 1.0-beta1, 1.0-beta10, 1.0-beta11, 1.0-beta2, 1.0-beta3, 1.0-beta4, 1.0-beta5, 1.0-beta6 | n/a |
Timeline
Publicly disclosed
Feb 12, 2009
Added to Industry KEV feed
Jun 13, 2019
Added to CIRCL KEV
Oct 14, 2023
Last updated
Apr 22, 2026
Weakness Type
- CWE-20 Improper Input Validation
References
- patchhttp://www.zeroshell.net/eng/announcements/
- patchhttp://www.zeroshell.net/eng/patch-details/#C100
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
cgi-bin/kerbynet in ZeroShell 1.0beta11 and earlier allows remote attackers to execute arbitrary commands via shell metacharacters in the type parameter in a NoAuthREQ x509List action.
Affected: Zeroshell versions 1.0-beta1, 1.0-beta10, 1.0-beta11, 1.0-beta2, 1.0-beta3, 1.0-beta4, 1.0-beta5, 1.0-beta6. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Jun 13, 2019.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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