Endian Firewall 3.3.25 Parameter /cgi-bin/zonefw.cgi remark cross site scripting

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic has been found in Endian Firewall 3.3.25. This impacts an unknown function of the file /cgi-bin/zonefw.cgi of the component Parameter Handler. This manipulation of the argument remark causes cross site scripting. This vulnerability appears as CVE-2026-34809. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in Endian Firewall 3.3.25. It has been declared as problematic. Affected by this vulnerability is some unknown processing of the file /cgi-bin/zonefw.cgi of the component Parameter Handler. The manipulation of the argument remark with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

Endian Firewall version 3.3.25 and prior allow stored cross-site scripting (XSS) via the remark parameter to /cgi-bin/zonefw.cgi. An authenticated attacker can inject arbitrary JavaScript that is stored and executed when other users view the affected page.

The weakness was presented by Alex Williams. The advisory is shared at help.endian.com. This vulnerability is known as CVE-2026-34809 since 03/30/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

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

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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Vendor

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Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.1
VulDB Meta Temp Score: 5.1

VulDB Base Score: 3.5
VulDB Temp Score: 3.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.4
NVD Vector: 🔒

CNA Base Score: 6.4
CNA Vector (VulnCheck): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

03/30/2026 CVE reserved
04/02/2026 +3 days Advisory disclosed
04/02/2026 +0 days VulDB entry created
07/26/2026 +115 days VulDB entry last update

Sourcesinfo

Advisory: help.endian.com
Researcher: Alex Williams
Status: Confirmed

CVE: CVE-2026-34809 (🔒)
GCVE (CVE): GCVE-0-2026-34809
GCVE (VulDB): GCVE-100-354913

Entryinfo

Created: 04/02/2026 17:31
Updated: 07/26/2026 06:06
Changes: 04/02/2026 17:31 (78), 07/26/2026 06:06 (12)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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