Endian Firewall 3.3.25 Parameter /cgi-bin/backup.cgi unlink Archive path traversal

Summaryinfo

A vulnerability was found in Endian Firewall 3.3.25. It has been rated as critical. Affected by this vulnerability is the function unlink of the file /cgi-bin/backup.cgi of the component Parameter Handler. The manipulation of the argument Archive leads to path traversal. This vulnerability is listed as CVE-2026-34790. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in Endian Firewall 3.3.25 and classified as critical. This issue affects the function unlink of the file /cgi-bin/backup.cgi of the component Parameter Handler. The manipulation of the argument ARCHIVE with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is integrity, and availability. The summary by CVE is:

Endian Firewall version 3.3.25 and prior allow authenticated users to delete arbitrary files via directory traversal in the remove ARCHIVE parameter to /cgi-bin/backup.cgi. The remove ARCHIVE parameter value is used to construct a file path without sanitization of directory traversal sequences, which is then passed to an unlink() call.

The weakness was presented by Alex Williams. The advisory is shared at help.endian.com. The identification of this vulnerability is CVE-2026-34790 since 03/30/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/02/2026). MITRE ATT&CK project uses the attack technique T1006 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Firewall Software

Vendor

• Endian

Name

• Firewall

Version

• 3.3.25

CPE 2.3info

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CPE 2.2info

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