Security readout for executives and security teams
Plain-English summary
This is a critical flaw in several D-Link routers and access points. An unauthenticated attacker on the network can abuse a PingTest web interface to run operating-system commands, potentially taking full control of the device. CISA lists it as known exploited, so internet-exposed devices should be treated as urgent.
Executive priority
Prioritize this as an emergency asset-exposure issue for any affected device exposed to untrusted networks. The combination of unauthenticated remote code execution, full device compromise impact, and CISA KEV status justifies rapid containment, replacement planning, and executive visibility.
Technical view
CVE-2019-16920 is CWE-78 command injection in a D-Link common gateway interface used for PingTest. The CVSS 3.1 score is 9.8: network reachable, low complexity, no privileges, no user interaction, with full confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely where affected D-Link models are still deployed, especially if their web administration interface is reachable from untrusted networks or the internet. The bundle lists DIR-655C, DIR-866L, DIR-652, DHP-1565, DIR-855L, DAP-1533, DIR-862L, DIR-615, DIR-835, and DIR-825.
Exploitation context
Active exploitation is supported by the CISA Known Exploited Vulnerabilities listing. Public references also describe affected device discovery and vulnerability details. The source bundle does not provide exploit volume, campaign attribution, or confirmed patch status.
Researcher notes
The CVE source bundle names affected models but has generic affected CPE data as n/a. Treat exact firmware scope and fix availability as evidence gaps unless confirmed through vendor or CERT/CC advisories. Avoid assuming all D-Link products are affected.
Mitigation direction
- Inventory D-Link devices and compare models against the listed affected products.
- Check D-Link, CERT/CC, and CISA guidance for supported firmware or replacement direction.
- Remove affected devices from internet exposure while remediation is assessed.
- Restrict administrative access to trusted management networks only.
- Retire or replace unsupported affected devices if no vendor fix is available.
Validation and detection
- Confirm model and firmware for every deployed D-Link router or access point.
- Review external asset inventory for exposed D-Link administrative interfaces.
- Check device logs for unusual PingTest or CGI activity where logs exist.
- Verify compensating controls block untrusted access to device management interfaces.
- Track remediation status against CISA KEV obligations where applicable.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2019-16920 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://fortiguard.com/zeroday/FG-VD-19-117CVE reference · x_refsource_MISC
- https://www.seebug.org/vuldb/ssvid-98079CVE reference · x_refsource_MISC
- https://medium.com/%4080vul/determine-the-device-model-affected-by-cve-2019-16920-by-zoomeye-bf6fec7f9bb3CVE reference · x_refsource_MISC
- VU#766427CVE reference · third-party-advisory, x_refsource_CERT-VN
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-16920CVE reference · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.