What is the CVSS score of CVE-2026-26791?

CVE-2026-26791 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.2%.

Which versions of Ar300m16 Firmware are affected by CVE-2026-26791?

GL-iNet GL-AR300M16 routers running v4.3.11 contain a critical command injection vulnerability that allows unauthenticated remote attackers to execute arbitrary commands with no patch currently…

How to fix or mitigate CVE-2026-26791?

Within 24 hours: Identify all GL-AR300M16 v4.3.11 devices in your network and isolate them from production environments if possible; disable the echo_server feature if not operationally critical. Within 7 days: Implement network segmentation to restrict access to affected devices, enable logging on all access attempts, and contact GL-iNet for patch availability timeline. Within 30 days: Plan for device replacement or upgrade to patched firmware versions as soon as available; conduct forensic review of device logs for signs of exploitation.

Ar300m16 Firmware CVE-2026-26791

CRITICAL

Command Injection (CWE-77)

2026-03-12 cve@mitre.org

Command Injection Ar300m16 Firmware

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 19:57 vuln.today

CVE Published

Mar 12, 2026 - 18:16 nvd

CRITICAL 9.8

DescriptionCVE.org

GL-iNet GL-AR300M16 v4.3.11 was discovered to contain a command injection vulnerability via the string port parameter in the enable_echo_server function. This vulnerability allows attackers to execute arbitrary commands via a crafted input.

AnalysisAI

GL-iNet GL-AR300M16 router (v4.3.11) is vulnerable to command injection through the string port parameter in the enable_echo_server function. Unauthenticated attackers can execute arbitrary commands on the router.

Technical ContextAI

The enable_echo_server function passes the port parameter to a system command without sanitization (CWE-77). Shell metacharacters in the port value are interpreted by the OS, enabling arbitrary command execution on the router.