Cyber Resilience

CVE-2025-7525

Command Injection in Totolink T6 Firmware v4.1.5cu.748_b20211015

Public PoCCommand Injection
Published
13 July 2025
Modified
17 June 2026
Patch / advisory
View advisory
CVSS Score v4 2.1
Click a component to see what it means
Raw vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.031 87th percentile
Risk Priority 33 floored blend · peak EPSS

Summary

CVE-2025-7525 is a low-severity Injection (CWE-74) vulnerability in Totolink T6 Firmware. Its CVSS base score is 2.1 (Low).

Operationally, exploitation aligns with the MITRE ATT&CK technique Command and Scripting Interpreter (T1059); ranked in the top 13% 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 map to SA-11 (Developer Testing and Evaluation) and SI-10 (Information Input Validation) — see the control section below for these in your framework.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

A vulnerability identified as CVE-2025-7525 exists in the TOTOLINK T6 router running firmware version 4.1.5cu.748_B20211015. It resides in the setTracerouteCfg function within the /cgi-bin/cstecgi.cgi file of the HTTP POST Request Handler component, where improper handling of the command argument permits command injection. The issue is tracked under CWE-74 and CWE-77 and carries a CVSS 4.0 score of 2.1 reflecting network attack vector, low attack complexity, and low-privileged access with limited impacts on confidentiality, integrity, and availability.

An authenticated remote attacker can send a crafted HTTP POST request to the affected endpoint and supply arbitrary commands through the manipulated argument. Successful exploitation grants the ability to execute operating-system commands on the device, potentially leading to limited unauthorized actions such as reading or modifying configuration data.

Public references consist of a GitHub repository containing a proof-of-concept and corresponding Vuldb entries that document the disclosure; no vendor advisory or patch information is included in the available references.

The exploit has been released publicly and the EPSS score remains flat at 0.0447 with no material increase observed after publication.

OWASP Top 10 for Web (2025)

A05:2025 Injection

EU & UK References

Vulnerability Data

A vulnerability was found in TOTOLINK T6 4.1.5cu.748_B20211015. It has been declared as critical. This vulnerability affects the function setTracerouteCfg of the file /cgi-bin/cstecgi.cgi of the component HTTP POST Request Handler. The manipulation of the argument command leads to command…

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injection. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.

CWE(s)
CWE-74CWE-77

Related Threats

MITRE ATT&CK Enterprise Techniques

T1059 Command and Scripting Interpreter Execution
Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries.
attack.mitre.org →
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 →
T1221 Template Injection Stealth
Adversaries may create or modify references in user document templates to conceal malicious code or force authentication attempts.
attack.mitre.org →
T1659 Content Injection Initial Access
Adversaries may gain access and continuously communicate with victims by injecting malicious content into systems through online network traffic.
attack.mitre.org →
T1674 Input Injection Execution
Adversaries may simulate keystrokes on a victim’s computer by various means to perform any type of action on behalf of the user, such as launching the command interpreter using keyboard shortcuts, typing an inline script to be executed,…
attack.mitre.org →
T1059.001 PowerShell Execution
Adversaries may abuse PowerShell commands and scripts for execution.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2025-7615Same product: Totolink T6
CVE-2025-7614Same product: Totolink T6
CVE-2025-7952Same product: Totolink T6
CVE-2025-7613Same product: Totolink T6
CVE-2025-7524Same product: Totolink T6
CVE-2026-1548Same vendor: Totolink
CVE-2026-1326Same vendor: Totolink
CVE-2026-1601Same vendor: Totolink
CVE-2025-3987Same vendor: Totolink
CVE-2025-5504Same vendor: Totolink

Affected Assets

totolink
t6 firmware
v4.1.5cu.748_b20211015

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V1.2.1
  • V1.2.3
  • V1.2.5
  • V1.2.8

Mitigating Controls (NIST 800-53 r5) AI

SA-11 Developer Testing and Evaluation good match

Developer testing and evaluation can discover command-construction flaws before deployment.

SI-10 Information Input Validation good match

SI-10 directly requires validation of information inputs to reject malformed or special-element content before it reaches downstream parsers.

SA-8 Security and Privacy Engineering Principles partial match

Secure engineering principles include proper neutralization and safe command construction practices.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly require input validation and output encoding that prevent injection flaws.

DE.CM-09 partial match
prevents

Runtime monitoring of software and data can detect anomalous command execution resulting from injection.

ID.RA-01 partial match
prevents

Identifying recorded vulnerabilities enables remediation of command-injection flaws before exploitation.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.28 Secure coding mostly match
prevents

Secure coding standards require proper escaping and parameterization of commands, directly eliminating CWE-77.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing in development catches injection vulnerabilities before release.

A.8.15 Logging partial match
finds

Logging supports detection of injection attempts but does not prevent the weakness.

A.8.16 Monitoring activities partial match
finds

Monitoring activities can identify active injection attacks after they occur.

A.8.25 Secure development life cycle partial match
prevents

Secure development life cycle mandates input validation and output encoding that directly prevent injection flaws.

A.8.26 Application security requirements partial match
prevents

Application security requirements explicitly call for controls against injection attacks in software design.

References