What is the CVSS score of CVE-2019-16920?

CVE-2019-16920 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: 100.0%.

Is there a public PoC exploit available for CVE-2019-16920?

Yes, a public proof-of-concept exploit is available for CVE-2019-16920. Prioritise patching immediately. EPSS: 100.0%.

Dir 615 Firmware CVE-2019-16920

CRITICAL

OS Command Injection (CWE-78)

2019-09-27 cve@mitre.org

RCE Command Injection D-Link Dir 615 Firmware Dir 655 Firmware Dir 825 Firmware Dir 866L Firmware Dir 652 Firmware Dhp 1565 Firmware Dir 855L Firmware Dap 1533 Firmware Dir 862L Firmware Dir 835 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: CRITICAL + in CISA KEV (actively exploited), no patch available.

Exploited in the wild (CISA KEV) No patch listed yet 100.0% exploitation probability (EPSS)

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AnalysisAI

Unauthenticated remote code execution occurs in D-Link products such as DIR-655C, DIR-866L, DIR-652, and DHP-1565. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Avoid passing user input to shell commands. Use language-specific APIs instead of shell execution. Apply strict input validation with allowlists.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

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. Unauthenticated remote code execution occurs in D-Link products such as DIR-655C, DIR-866L, DIR-652, and DHP-1565. The issue occurs when the attacker sends an arbitrary input to a "PingTest" device common gateway interface that could lead to common injection. An attacker who successfully triggers the command injection could achieve full system compromise. Later, it was independently found that these are also affected: DIR-855L, DAP-1533, DIR-862L, DIR-615, DIR-835, and DIR-825. Affected products include: Dlink Dir-655 Firmware, Dlink Dir-866L Firmware, Dlink Dir-652 Firmware, Dlink Dhp-1565 Firmware, Dlink Dir-855L 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

Sep 27, 2019 - 12:15 nvd

CRITICAL 9.8

DescriptionNVD

Unauthenticated remote code execution occurs in D-Link products such as DIR-655C, DIR-866L, DIR-652, and DHP-1565. The issue occurs when the attacker sends an arbitrary input to a "PingTest" device common gateway interface that could lead to common injection. An attacker who successfully triggers the command injection could achieve full system compromise. Later, it was independently found that these are also affected: DIR-855L, DAP-1533, DIR-862L, DIR-615, DIR-835, and DIR-825.

Threat Intelligence Overview

EPSS Score

100.0%

Top 0% exploitable

Exploit

POC

Public exploit code exists

Data Quality

2 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 100.0%

Patch available No

Active threat Yes

Deciding rule

CRITICAL + in CISA KEV (actively exploited), no 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

219

Low Medium High Critical

KEV: +50

EPSS: +100

CVSS: +49

PoC: +20

Weaponized: 0

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.

Remote Code Execution CRITICAL

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

Affected Products (CPE)NVD

cpe:2.3:o:dlink:dir-655_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:dlink:dir-866l_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:dlink:dir-652_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:dlink:dhp-1565_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:dlink:dir-855l_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:dlink:dap-1533_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:dlink:dir-862l_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:dlink:dir-615_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:dlink:dir-835_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:dlink:dir-825_firmware:-:*:*:*:*:*:*:*

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References

Advisories & patches

REF https://fortiguard.com/zeroday/FG-VD-19-117 REF https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-16920 REF https://www.kb.cert.org/vuls/id/766427

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