CVE-2026-34797

HighPublic PoCRCE

Published: 02 April 2026

Published

02 April 2026

Modified

07 April 2026

KEV Added

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Patch

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CVSS Score 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0046 64.3th percentile

Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-34797 is a high-severity OS Command Injection (CWE-78) vulnerability in Endian Firewall Community. Its CVSS base score is 8.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 35.7% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-10 Information Input Validation good match

prevent

Directly addresses the incomplete regular expression validation of the DATE parameter by requiring comprehensive validation of all user inputs before use in Perl open() calls to prevent command injection.

SI-2 Flaw Remediation good match

prevent

Ensures timely remediation through patching of the specific command injection flaw in /cgi-bin/logs_smtp.cgi as detailed in vendor guidance.

AC-6 Least Privilege partial match

prevent

Limits the impact of exploitation by enforcing least privilege for authenticated low-privilege users accessing the vulnerable web interface, reducing the privileges available for injected OS commands.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1059.004 Unix Shell Execution

Adversaries may abuse Unix shell commands and scripts for execution.

attack.mitre.org →

Why these techniques?

Command injection in web CGI (/cgi-bin/logs_smtp.cgi) enables exploitation of public-facing application (T1190) and arbitrary Unix shell command execution (T1059.004).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

NVD Description

Endian Firewall version 3.3.25 and prior allow authenticated users to execute arbitrary OS commands via the DATE parameter to /cgi-bin/logs_smtp.cgi. The DATE parameter value is used to construct a file path that is passed to a Perl open() call, which…

allows command injection due to an incomplete regular expression validation.

Deeper analysisAI

CVE-2026-34797 is a command injection vulnerability (CWE-78) with a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) affecting Endian Firewall versions 3.3.25 and prior. The issue resides in the /cgi-bin/logs_smtp.cgi component, where the DATE parameter is used to build a file path passed directly to a Perl open() call. Incomplete regular expression validation on this parameter enables authenticated users to inject and execute arbitrary operating system commands.

Attackers require only low-privilege authenticated access to the firewall's web interface and can exploit the vulnerability remotely over the network with low complexity and no user interaction. Successful exploitation grants attackers the ability to execute arbitrary OS commands, potentially leading to full system compromise with high impacts on confidentiality, integrity, and availability.

Mitigation guidance and patch information are available in the Endian community help section at https://help.endian.com/hc/en-us/sections/360004371358-Community and the VulnCheck advisory at https://www.vulncheck.com/advisories/endian-firewall-cgi-bin-logs-smtp-cgi-date-perl-command-injection.