What is the CVSS score of CVE-2026-5679?

CVE-2026-5679 has a CVSS 4.0 base score of 2.0 (Low). CVSS vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P. EPSS exploitation probability: 0.9%.

Is there a public PoC exploit available for CVE-2026-5679?

Yes, a public proof-of-concept exploit is available for CVE-2026-5679. Prioritise patching immediately. EPSS: 0.9%.

A3300R CVE-2026-5679

EUVD-2026-19464 LOW

OS Command Injection (CWE-78)

2026-04-06 VulDB

GHSA-cmq3-f6cg-p3p7

Command Injection TOTOLINK A3300R

2.0

CVSS 4.0 · Vendor: VulDB

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Vulnerability Assessment

Weakness	CWE CWE-78 OWASP Top 10:2025 A05:2025 - Injection ASVS 5.0 V1 - Encoding and Sanitization OS command sanitization, avoid shell exec MITRE ATT&CK 2 techniques across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	The CVSS:4.0 vector AV:A/AC:L/PR:L/UI:N indicates an adjacent network attack vector with low complexity and low privilege requirements, which somewhat constrains real-world risk compared to direct internet-facing RCE. However, the presence of publicly available exploit code (confirmed in GitHub repository) significantly raises operational risk for vulnerable deployments. The EPSS exploitation probability is not provided in the input data, but the combination of low CVSS complexity, published POC, and low authentication barriers suggests moderate-to-high real-world exploitability for attackers within network proximity (e.g., WiFi neighbors, same subnet). The CVSS impact ratings are all low (VC:L/VI:L/VA:L), meaning this is not a critical system compromise - it grants limited confidentiality, integrity, and availability impact - but it does enable lateral movement and credential harvesting within home/office networks. Organizations with internet-facing Totolik routers or those deployed in untrusted network environments should prioritize mitigation; home users in trusted LANs face lower risk but should still patch.
Exploit ScenarioDerived	An attacker on the same wireless network (or connected subnet) with basic user credentials (or via credential compromise) accesses the Totolink A3300R web management interface at /cgi-bin/cstecgi.cgi and crafts a request to the vsetTr069Cfg function with a malicious stun_pass parameter containing shell metacharacters (e.g., `; whoami;`) to execute arbitrary commands. Publicly available exploit code in the referenced GitHub repository (https://github.com/Svigo-o/TOTOLINK-Vul/tree/main/totolink-a3300r-stun-pass-cmd-injection) demonstrates proof of concept, making this attack straightforward to execute for an attacker with network proximity and basic authentication.

Monitor Track and reassess. Why: LOW severity (CVSS 0.1-3.9).

No patch listed yet 0.9% exploitation probability (EPSS)

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AnalysisAIv1 – Apr 06, 2026

OS command injection in Totolink A3300R firmware version 17.0.0cu.557_B20221024 allows authenticated local attackers to execute arbitrary commands via the stun_pass parameter in the vsetTr069Cfg function of /cgi-bin/cstecgi.cgi. The vulnerability has a CVSS score of 5.1 (medium severity) with CVSS:4.0/AV:A/AC:L/PR:L vector indicating adjacent network access and low authentication requirements. Publicly available exploit code exists, though active exploitation status (CISA KEV) is not confirmed.

RemediationAI

Check Totolink's official website (https://www.totolink.net/) for the latest firmware release for the A3300R model and upgrade immediately if a patched version is available. If no official patch has been released, restrict network access to the router's management interface by disabling remote management, limiting administrative access to trusted hosts only, and segmenting the router's management VLAN from untrusted network segments. Apply strong authentication credentials (long, complex passwords) to any user accounts with access to the router's web interface. Monitor Totolink security advisories and VulDB (https://vuldb.com/vuln/355506) for patch availability confirmation.

Affected VersionsENISA

A3300R 17.0.0cu.557_B20221024

Affected Packages

euvd a3300r no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability exploits improper input validation in the vsetTr069Cfg CGI function, a component of Totolink A3300R router firmware. The stun_pass parameter is passed unsanitized to an OS command execution context, enabling CWE-78 OS command injection. The Totolink A3300R is a residential wireless router (CPE: cpe:2.3:a:totolink:a3300r:*:*:*:*:*:*:*:*) commonly deployed in enterprise and home networks. The /cgi-bin/cstecgi.cgi endpoint handles TR-069 (CPE WAN Management Protocol) configuration, making this function a direct interface to device management. Attackers with low-privilege access (authenticated users on the adjacent network) can inject shell metacharacters into the stun_pass field to break out of the intended command context and execute arbitrary code with the privileges of the CGI process.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (VulDB) PRIMARY 2.0 LOW

CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

Primary rating from Vendor (VulDB) · only source for this CVE.

CVSS VectorVendor: VulDB

Attack Vector

Adjacent

Attack Complexity

Low

Attack Requirements

None

Privileges Required

Low

User Interaction

None

Vulnerable system: Confidentiality

Low

Vulnerable system: Integrity

Low

Vulnerable system: Availability

Low

Subsequent system: Confidentiality

None

Subsequent system: Integrity

None

Subsequent system: Availability

None

Lifecycle Timeline

Severity Changed

Apr 29, 2026 - 01:11 NVD

MEDIUM LOW

CVSS changed

Apr 29, 2026 - 01:11 NVD

5.1 (MEDIUM) 2.0 (LOW)

PoC Detected

Apr 07, 2026 - 13:20 vuln.today

Public exploit code

CVE Published

Apr 06, 2026 - 19:00 nvd

MEDIUM 5.1

DescriptionCVE.org

A security vulnerability has been detected in Totolink A3300R 17.0.0cu.557_B20221024. The impacted element is the function vsetTr069Cfg of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument stun_pass leads to os command injection. The exploit has been disclosed publicly and may be used.

Threat Intelligence Overview

EPSS Score

0.9%

Top 25% exploitable

Exploit

POC

Public exploit code exists

Data Quality

7 sources

Confidence: High

EUVD

NVD

CVE.org

EPSS

Vulnrichment

GitHub

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity LOW

CISA KEV No

Public POC Yes

EPSS 0.9%

Patch available No

Active threat No

Deciding rule

LOW severity (CVSS 0.1-3.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.