Cyber Resilience

CVE-2025-2096

Command Injection in Totolink Ex1800T Firmware 9.1.0cu.2112_b20220316

Public PoCCommand Injection
Published
07 March 2025
Modified
03 April 2025
Patch / advisory
View advisory
CVSS Score v4 5.3
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:X/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 0.027 85th percentile
Risk Priority 39 floored blend · peak EPSS

Summary

CVE-2025-2096 is a medium-severity Command Injection (CWE-77) vulnerability in Totolink Ex1800T Firmware. Its CVSS base score is 5.3 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Command and Scripting Interpreter (T1059); ranked in the top 15% 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 critical OS command injection vulnerability exists in the TOTOLINK EX1800T wireless router running firmware version 9.1.0cu.2112_B20220316. The flaw resides in the setRebootScheCfg function within /cgi-bin/cstecgi.cgi, where unsanitized input to the mode, week, minute, and recHour parameters allows arbitrary command execution. It is tracked as CVE-2025-2096, carries a CVSS v4 score of 5.3, and is associated with CWE-77 and CWE-78.

An authenticated remote attacker can supply crafted HTTP requests to the CGI endpoint and execute operating-system commands on the device. Because the attack requires only low-privileged credentials and no user interaction, an adversary who obtains or guesses valid administrative access can leverage the injection to alter device behavior, exfiltrate configuration data, or pivot further into the network.

Public exploit code has been released, and the vulnerability is listed on multiple tracking platforms, yet the current EPSS score remains low at 0.0395 with a peak of only 0.0422, indicating limited observed exploitation interest to date. No vendor advisory or firmware update addressing the issue is referenced in the available sources.

OWASP Top 10 for Web (2025)

A05:2025 Injection

EU & UK References

Vulnerability Data

A vulnerability classified as critical was found in TOTOLINK EX1800T 9.1.0cu.2112_B20220316. This vulnerability affects the function setRebootScheCfg of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument mode/week/minute/recHour leads to os command injection. The attack can be initiated remotely. The exploit…

more

has been disclosed to the public and may be used.

CWE(s)
CWE-77CWE-78

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 →
T1059.003 Windows Command Shell Execution
Adversaries may abuse the Windows command shell for execution.
attack.mitre.org →
T1059.004 Unix Shell Execution
Adversaries may abuse Unix shell commands and scripts for execution.
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 →
T1059.001 PowerShell Execution
Adversaries may abuse PowerShell commands and scripts for execution.
attack.mitre.org →
T1059.008 Network Device CLI Execution
Adversaries may abuse scripting or built-in command line interpreters (CLI) on network devices to execute malicious command and payloads.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2025-2095Same product: Totolink Ex1800T
CVE-2025-2094Same product: Totolink Ex1800T
CVE-2023-51016Same product: Totolink Ex1800T
CVE-2023-51014Same product: Totolink Ex1800T
CVE-2023-51025Same product: Totolink Ex1800T
CVE-2023-51028Same product: Totolink Ex1800T
CVE-2023-52026Same product: Totolink Ex1800T
CVE-2026-3696Same vendor: Totolink
CVE-2024-10966Same vendor: Totolink
CVE-2026-3301Same vendor: Totolink

Affected Assets

totolink
ex1800t firmware
9.1.0cu.2112_b20220316

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)
  • V1.2.3
  • V1.2.5
  • V1.2.8
  • V1.2.9

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

Input validation directly stops construction of commands from untrusted data containing special elements.

AC-6 Least Privilege partial match

Least privilege reduces the permissions available to any process that could be subverted by injected commands.

CM-7 Least Functionality partial match

Least functionality restricts available OS commands and interpreters, limiting the blast radius of injection.

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 neutralization that prevent command injection.

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.

PR.PS-02 partial match
prevents

Routine patching/maintenance can remediate known command-injection CVEs in dependencies (partial forward) but does nothing to stop developers from introducing improper neutralization in custom code (none reverse).

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 command-injection vulnerabilities before release.

A.8.25 Secure development life cycle partial match
prevents

Secure development life cycle mandates input validation and command construction practices that directly prevent command injection.

A.8.26 Application security requirements partial match
prevents

Application security requirements explicitly call for controls against injection flaws including command injection.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles reduce the attack surface but do not prescribe the specific neutralization techniques needed.

A.8.31 Separation of development, test and production environments none match
none

Environment separation limits the blast radius of an exploited command injection but does not prevent the flaw itself.

References