CVE-2019-17621
RCE in Dlink Dir-859 Firmware ≤ 1.05b03
Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSummary
CVE-2019-17621 is a critical-severity OS Command Injection (CWE-78) vulnerability in Dlink Dir-859 Firmware. Its CVSS base score is 9.8 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Command and Scripting Interpreter (T1059); ranked in the top 0.2% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog; a public proof-of-concept is referenced.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
The vulnerability is an OS command injection flaw (CWE-78) affecting the UPnP service on D-Link DIR-859 Wi-Fi routers running firmware versions 1.05 and 1.06B01 Beta01. Specifically, the /gena.cgi endpoint accepts unauthenticated HTTP SUBSCRIBE requests that can be manipulated to execute arbitrary system commands with root privileges.
An attacker with network adjacency to the device can exploit the issue remotely without authentication or user interaction by crafting a malicious SUBSCRIBE request to the UPnP service. Successful exploitation grants full root-level control over the router, enabling arbitrary command execution, configuration changes, or further lateral movement within the local network. The flaw carries a CVSS 3.1 base score of 9.8.
D-Link has published security advisories SAP10146 and SAP10147 addressing the affected router models. Public proof-of-concept code demonstrating unauthenticated remote command execution has been released via Packet Storm and technical write-ups.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2019-7939
Vulnerability Data
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…
more
to the local network.
- CWE(s)
- KEV Date Added
- 29 June 2023
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Control response
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V1.2.5V1.2.8V15.2.5
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
PR.PS-06's SDLC practices directly require secure coding and input handling that blocks command-injection defects, yet the single broad outcome leaves many specific neutralization vectors and verification gaps unaddressed.
Routine patching/maintenance can remediate known command-injection CVEs in dependencies (partial forward) but does nothing to stop developers from introducing improper neutralization in custom code (none reverse).
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
Security testing and code review target insecure use of operating-system command interfaces, catching command-injection flaws introduced during development.