What is the CVSS score of CVE-2019-17621?

CVE-2019-17621 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 89.6%.

Is there a public PoC exploit available for CVE-2019-17621?

Yes, a public proof-of-concept exploit is available for CVE-2019-17621. Prioritise patching immediately. EPSS: 89.6%.

Is there a patch available for CVE-2019-17621?

Yes, a patch is available for CVE-2019-17621. Update the affected software to the latest version immediately.

Dir 868l Firmware CVE-2019-17621

CRITICAL

OS Command Injection (CWE-78)

2019-12-30 cve@mitre.org

Command Injection D-Link Dir 868l Firmware Dir 890L Firmware Dir 880L Firmware Dir 822 Firmware Dir 895L Firmware Dir 823 Firmware Dir 885L Firmware Dir 865L Firmware Dir 895R Firmware Dir 859 Firmware Dir 869 Firmware Dir 890R Firmware Dir 885R Firmware Dir 818Lx Firmware

9.8

CVSS 3.1 · NVD

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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	CVSS score of 9.8 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. Public proof-of-concept exploit code is available.
Exploit ScenarioDerived	A remote attacker could execute arbitrary operating system commands on the host by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.

Act Now Prioritize within 24-48h. Why: In CISA KEV with patch available.

Exploited in the wild (CISA KEV) Patch available 89.6% exploitation probability (EPSS)

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AnalysisAI

The UPnP endpoint URL /gena.cgi in the D-Link DIR-859 Wi-Fi router 1.05 and 1.06B01 Beta01 allows an Unauthenticated remote attacker to execute system commands as root, by sending a specially crafted. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Avoid passing user input to shell commands. Use language-specific APIs instead of shell execution. Apply strict input validation with allowlists.

Affects your stack

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

Technical ContextAI · show details

This vulnerability is classified as OS Command Injection (CWE-78), which allows attackers to execute arbitrary operating system commands on the host. The UPnP endpoint URL /gena.cgi in the D-Link DIR-859 Wi-Fi router 1.05 and 1.06B01 Beta01 allows an Unauthenticated remote attacker to execute system commands as root, by sending a specially crafted HTTP SUBSCRIBE request to the UPnP service when connecting to the local network. Affected products include: Dlink Dir-859 Firmware, Dlink Dir-822 Firmware, Dlink Dir-823 Firmware, Dlink Dir-865L Firmware, Dlink Dir-868L Firmware.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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

High

Integrity

High

Availability

High

Lifecycle Timeline

Added to CISA KEV

Jul 14, 2026 - 04:22 CISA

CVE Published

Dec 30, 2019 - 17:15 nvd

CRITICAL 9.8

DescriptionNVD

The UPnP endpoint URL /gena.cgi in the D-Link DIR-859 Wi-Fi router 1.05 and 1.06B01 Beta01 allows an Unauthenticated remote attacker to execute system commands as root, by sending a specially crafted HTTP SUBSCRIBE request to the UPnP service when connecting to the local network.

Threat Intelligence Overview

EPSS Score

89.6%

Top 0% exploitable

Exploit

POC

Public exploit code exists

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

CISA KEV

EPSS POC (1)

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 CRITICAL

CISA KEV Yes

Public POC Yes

EPSS 89.6%

Patch available Yes

Active threat Yes

Deciding rule

In CISA KEV with patch available

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

Immediate

Exploitation· derived

Active

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

High

Priority Score

224

Low Medium High Critical

KEV: +50

EPSS: +90

CVSS: +49

PoC: +20

Weaponized: +15

Threat intel: 0

Gov advisory: 0

Attack Technique

OS Command Injection CRITICAL

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

Affected Products (CPE)NVD

cpe:2.3:o:dlink:dir-859_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:dlink:dir-859_firmware:1.06b01:beta1:*:*:*:*:*:*

cpe:2.3:o:dlink:dir-822_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:dlink:dir-823_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:dlink:dir-823_firmware:1.00b06:beta:*:*:*:*:*:*

cpe:2.3:o:dlink:dir-865l_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:dlink:dir-868l_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:dlink:dir-869_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:dlink:dir-869_firmware:1.03b02:beta02:*:*:*:*:*:*

cpe:2.3:o:dlink:dir-880l_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:dlink:dir-890l_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:dlink:dir-890l_firmware:1.11b01:beta01:*:*:*:*:*:*

cpe:2.3:o:dlink:dir-890r_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:dlink:dir-890r_firmware:1.11b01:beta01:*:*:*:*:*:*

cpe:2.3:o:dlink:dir-885l_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:dlink:dir-885r_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:dlink:dir-895l_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:dlink:dir-895r_firmware:*:*:*:*:*:*:*:*

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References

Advisories & patches

PATCH https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10146 PATCH https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10147 ADVISORY https://www.dlink.com/en/security-bulletin REF https://medium.com/%40s1kr10s/d-link-dir-859-rce-unautenticated-cve-2019-17621-es-fad716629ff9 REF https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-17621 REF https://www.ftc.gov/system/files/documents/cases/dlink_proposed_order_and_judgment_7-2-19.pdf

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