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Vulnerabilities/CVE-2019-16920Public Intelligence Dossier
Source: dlink · Limited verification•Last verified: •Collection Running
CVE-2019-16920ListedCRITICAL (raw)CVSS 9.8CWE-78

Unauthenticated remote code execution occurs in D-Link products such as DIR-655C, DIR-866L, DIR-652, and DHP-1565

Published: 27 Sept 2019•Last updated: 17 Jun 2026, 07:52 AM IST•Source identifier: cve@mitre.org
Dossier completeness: source-provided sections 3 / 3 · rule guidance available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Listed
Added25 Mar 2022
Due15 Apr 2022
RansomwareUnknown
CVSS score
9.8CRITICAL (raw)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Metric sourcenvd@nist.gov
EPSS probability
100%1.000
Percentile100th
Weakness type
CWE-78
No further CWE recorded
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

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.

SOC priority

Immediate Attention

Actively exploited (source statement)

Yes

Publicly disclosed

Unknown

Risk basis: CISA KEV exploitation signal; CRITICAL severity; Source-confirmed exploitation or CISA KEV/ransomware metadata

Affected Products & Remediation

10 source-backed products
Affected products and versions (source)
  • dlink dir-655 firmware · <= 3.02b05 · NVD CPE · Source
  • dlink dir-866l firmware · <= 1.03b04 · NVD CPE · Source
  • dlink dir-652 firmware · version range not provided by source · NVD CPE · Source
  • dlink dhp-1565 firmware · <= 1.01 · NVD CPE · Source
  • dlink dir-855l firmware · version range not provided by source · NVD CPE · Source
  • dlink dap-1533 firmware · version range not provided by source · NVD CPE · Source
  • dlink dir-862l firmware · version range not provided by source · NVD CPE · Source
  • dlink dir-615 firmware · version range not provided by source · NVD CPE · Source
  • dlink dir-835 firmware · version range not provided by source · NVD CPE · Source
  • dlink dir-825 firmware · version range not provided by source · NVD CPE · Source
NVD applicability prerequisites: cpe:2.3:h:dlink:dir-655:cx:*:*:*:*:*:*:*, cpe:2.3:h:dlink:dir-866l:ax:*:*:*:*:*:*:*, cpe:2.3:h:dlink:dir-652:ax:*:*:*:*:*:*:*, cpe:2.3:h:dlink:dhp-1565:ax:*:*:*:*:*:*:*, cpe:2.3:h:dlink:dir-855l:-:*:*:*:*:*:*:*, cpe:2.3:h:dlink:dap-1533:-:*:*:*:*:*:*:*, cpe:2.3:h:dlink:dir-862l:-:*:*:*:*:*:*:*, cpe:2.3:h:dlink:dir-615:-:*:*:*:*:*:*:*, cpe:2.3:h:dlink:dir-835:-:*:*:*:*:*:*:*, cpe:2.3:h:dlink:dir-825:-:*:*:*:*:*:*:*. These are conditions, not proof that an environment is exposed or unaffected.
Recorded patch / KBNot provided by source

Vendor or catalog guidance (source)

  • CISA KEV: The impacted product is end-of-life and should be disconnected if still in use.

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Listed
Exploited (source statement)
Yes
Publicly disclosed (source)
Unknown

CISA required action: The impacted product is end-of-life and should be disconnected if still in use.

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

Matched kev-network-exposure (CVSS AV:N, CISA KEV Listed); command-injection (CWE-78)

Exposure

  1. Identify assets with the exact CVE and confirm the affected product/version against the advisory.Telemetry: DeviceTvmSoftwareVulnerabilities · KEV listing raises urgency, but inventory is needed to establish local exposure. · Rule kev-network-exposure
  2. Identify installations of the affected product and compare versions with the advisory.Telemetry: DeviceTvmSoftwareVulnerabilities · A weakness class does not establish local exposure. · Rule command-injection

Exploitation evidence

  1. Review relevant edge or application access logs for unusual requests around the advisory window.Telemetry: CommonSecurityLog · Log review is a hunting hypothesis; KEV listing alone does not show local exploitation. · Rule kev-network-exposure
Show more (2)

Exploitation evidence

  1. Review command interpreters spawned by the affected service or application.Telemetry: DeviceProcessEvents · Unexpected process lineage can support command-injection hunting. · Rule command-injection

Response

  1. Recheck the affected assets after the source-stated mitigation or update is applied.Telemetry: DeviceTvmSoftwareVulnerabilities · A follow-up inventory check verifies local remediation. · Rule kev-network-exposure

CISA KEV Record

Catalog entry
25 Mar 2022
Required action due
15 Apr 2022
Known ransomware use
Unknown

The impacted product is end-of-life and should be disconnected if still in use.

Change History & Source Data

— No recorded material change

CNA / source
cve@mitre.org
Record status · verification
UPDATED · CISA KEV confirmed
CPE
cpe:2.3:o:dlink:dir-655_firmware:*:*:*:*:*:*:*:*, cpe:2.3:h:dlink:dir-655:cx:*:*:*:*:*:*:*, cpe:2.3:o:dlink:dir-866l_firmware:*:*:*:*:*:*:*:*, cpe:2.3:h:dlink:dir-866l:ax:*:*:*:*:*:*:*, cpe:2.3:o:dlink:dir-652_firmware:-:*:*:*:*:*:*:*, cpe:2.3:h:dlink:dir-652:ax:*:*:*:*:*:*:*, cpe:2.3:o:dlink:dhp-1565_firmware:*:*:*:*:*:*:*:*, cpe:2.3:h:dlink:dhp-1565:ax:*:*:*:*:*:*:*, cpe:2.3:o:dlink:dir-855l_firmware:-:*:*:*:*:*:*:*, cpe:2.3:h:dlink:dir-855l:-:*:*:*:*:*:*:*

Evidence & Provenance

4 public sources
CISA KEV CatalogAdded 2022-03-25nvd.nist.govSource recordfortiguard.comSource recordmedium.comSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2019-16920
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2019-16920
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2019-16920"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Open KQL Library

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Correlated briefings

SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.