Skip to main content

Dir 816 Firmware EUVDEUVD-2025-16942

| CVE-2025-5621 HIGH
Command Injection (CWE-77)
2025-06-05 cna@vuldb.com
7.3
CVSS 3.1 · NVD
View

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Command injection prevention
MITRE ATT&CK

1 technique across 1 tactic: Execution

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Impact

CVSS 7.3. EPSS 1.0%. Public PoC/exploit available. No patch confirmed.

Exploit ScenarioDerived

An attacker could exploit this vulnerability in A vulnerability to compromise the security of affected deployments, potentially impacting confidentiality, integrity, or availability.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
No patch listed yet 1.0% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAIv1 – Mar 14, 2026

A command injection vulnerability in A vulnerability (CVSS 7.3). Risk factors: public PoC available.

Earlier versions of this analysis (1)
v1 Mar 14, 2026 - 17:53 CVSS 7.3

A vulnerability has been found in D-Link DIR-816 1.10CNB05 and classified as critical. Affected by this vulnerability is the function qosClassifier of the file /goform/qosClassifier. The manipulation

RemediationAI

Monitor vendor channels for patch availability. Implement input validation and WAF rules as interim mitigation.

Affected VersionsENISA

DIR-816 1.10CNB05

Affected Packages

euvd dir_816 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

CWE-77 (Command Injection). CVSS 7.3 indicates high severity. Affects A vulnerability.

Know when Dir 816 Firmware gets its next vulnerability

  • Watch products and get an email when something new is published
  • Check this CVE against your own stack and servers
  • Exploit and PoC references, threat intelligence from 22 sources

No credit card · 7-day full trial

Severity by source

NVD PRIMARY 7.3 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

Lifecycle Timeline

2
PoC Detected
Jun 06, 2025 - 15:42 vuln.today
Public exploit code
CVE Published
Jun 05, 2025 - 00:15 nvd
HIGH 7.3

DescriptionCVE.org

A vulnerability has been found in D-Link DIR-816 1.10CNB05 and classified as critical. Affected by this vulnerability is the function qosClassifier of the file /goform/qosClassifier. The manipulation of the argument dip_address/sip_address leads to os command injection. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. This vulnerability only affects products that are no longer supported by the maintainer.

Executive ViewAI

Why It Matters

D-Link DIR-816 routers running firmware 1.10CNB05 contain a critical remote code execution vulnerability that allows unauthenticated attackers to execute arbitrary commands. Organizations using this end-of-life device face immediate risk of network compromise, unauthorized access, and potential lateral movement into corporate systems.

Business Impact: High
Compensating Controls

Implement network access controls restricting access to the affected device's web interface; disable QoS features if operationally feasible; deploy WAF/IDS rules to block malicious payloads targeting /goform/qosClassifier endpoint; segment affected devices behind firewall rules limiting their network exposure; consider disabling remote management access; monitor for suspicious activity on affected devices.

Threat Intelligence Overview

EPSS Score
1.0%
Top 23% exploitable
Exploit
POC
Public exploit code exists
Data Quality
6 sources
Confidence: High

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 HIGH
CISA KEV No
Public POC Yes
EPSS 1.0%
Patch available No
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
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.

SSVC AssessmentENISA

SSVC Decision· derived
Out-of-Cycle
Exploitation· derived
Poc
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact
High

Priority Score

57
Low Medium High Critical
KEV: 0
EPSS: +1
CVSS: +36
PoC: +20
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

OS command injection occurs when an application passes unsanitized user input directly into system shell commands.

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.

CVE-2024-24321 CRITICAL POC
9.8 Feb 08

An issue in Dlink DIR-816A2 v.1.10CNB05 allows a remote attacker to execute arbitrary code via the wizardstep4_ssid_2 pa

CVE-2025-45931 CRITICAL POC
9.8 Jun 30

An issue D-Link DIR-816-A2 DIR-816A2_FWv1.10CNB05_R1B011D88210 allows a remote attacker to execute arbitrary code via sy

CVE-2025-5623 CRITICAL POC
9.8 Jun 05

Critical stack-based buffer overflow vulnerability in D-Link DIR-816 1.10CNB05 affecting the qosClassifier function's di

CVE-2025-5630 CRITICAL POC
9.8 Jun 05

Critical stack-based buffer overflow vulnerability in D-Link DIR-816 firmware version 1.10CNB05 affecting the /goform/fo

CVE-2025-5624 CRITICAL POC
9.8 Jun 05

Critical stack-based buffer overflow vulnerability in D-Link DIR-816 firmware version 1.10CNB05 affecting the QoSPortSet

CVE-2025-5622 CRITICAL POC
9.8 Jun 05

Critical stack-based buffer overflow vulnerability in D-Link DIR-816 wireless router (version 1.10CNB05) affecting the 5

CVE-2022-43003 CRITICAL POC
9.8 Oct 26

D-Link DIR-816 A2 1.10 B05 was discovered to contain a stack overflow via the pskValue parameter in the setRepeaterSecur

CVE-2022-43002 CRITICAL POC
9.8 Oct 26

D-Link DIR-816 A2 1.10 B05 was discovered to contain a stack overflow via the wizardstep54_pskpwd parameter at /goform/f

CVE-2022-43001 CRITICAL POC
9.8 Oct 26

D-Link DIR-816 A2 1.10 B05 was discovered to contain a stack overflow via the pskValue parameter in the setSecurity func

CVE-2022-43000 CRITICAL POC
9.8 Oct 26

D-Link DIR-816 A2 1.10 B05 was discovered to contain a stack overflow via the wizardstep4_pskpwd parameter at /goform/fo

CVE-2022-42998 CRITICAL POC
9.8 Oct 26

D-Link DIR-816 A2 1.10 B05 was discovered to contain a stack overflow via the srcip parameter at /goform/form2IPQoSTcAdd

CVE-2022-37130 CRITICAL POC
9.8 Aug 31

In D-Link DIR-816 A2_v1.10CNB04, DIR-878 DIR_878_FW1.30B08.img a command injection vulnerability occurs in /goform/Diagn

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy