CVE-2025-26063

CriticalPublic PoCRCE

Published: 31 July 2025

Published

31 July 2025

Modified

03 November 2025

KEV Added

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Patch

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CVSS Score 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0165 82.2th percentile

Risk Priority 21 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-26063 is a critical-severity Command Injection (CWE-77) vulnerability in Intelbras Rx 1500 Firmware. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 17.8% 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 AC-14 (Permitted Actions Without Identification or Authentication) and SI-10 (Information Input Validation).

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 prevents command injection vulnerabilities like CVE-2025-26063 by requiring validation and sanitization of untrusted inputs such as crafted ESSID names.

SI-2 Flaw Remediation good match

prevent

Mandates timely flaw remediation through firmware updates, as Intelbras provided for RX1500 and RX3000 to fix this specific command injection issue.

AC-14 Permitted Actions Without Identification or Authentication good match

prevent

Prohibits unauthenticated actions such as network creation with ESSID payloads, directly blocking remote attackers from exploiting the vulnerability without identification or authentication.

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?

Direct unauthenticated command injection RCE on public-facing router firmware enables T1190 (Exploit Public-Facing Application) for initial access and T1059.004 (Unix Shell) for arbitrary command execution.

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

NVD Description

An issue in Intelbras RX1500 v2.2.9 and RX3000 v1.0.11 allows unauthenticated attackers to execute arbitrary code via injecting a crafted payload into the ESSID name when creating a network.

Deeper analysisAI

CVE-2025-26063 is a command injection vulnerability (CWE-77) affecting Intelbras RX1500 firmware version 2.2.9 and RX3000 firmware version 1.0.11. The flaw enables unauthenticated attackers to execute arbitrary code by injecting a crafted payload into the ESSID name during network creation processes on these wireless router devices.

Attackers can exploit this vulnerability remotely over the network (AV:N) with low attack complexity (AC:L), requiring no privileges (PR:N) or user interaction (UI:N). Successful exploitation grants high-impact remote code execution, compromising confidentiality, integrity, and availability (C:H/I:H/A:H), as reflected in the CVSS v3.1 base score of 9.8.

Intelbras addresses the issue in the official change logs for RX1500 and RX3000 models, available via their manuals site. Further technical details, including proof-of-concept information, appear in Full Disclosure mailing list postings from July 2025.