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CVE-2019-17621: D-Link DIR-859 Router Command Execution Vulnerability

criticalknown exploitedpublic exploitCVE-2019-17621
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
D-Link DIR-859 router contains a command execution vulnerability in the UPnP endpoint URL, /gena.cgi. Exploitation 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.

CSIRTS triage

vendor: D-Linkproduct: DIR-859 RouterRemote code execution
What
A command execution vulnerability in the UPnP endpoint allows an unauthenticated remote attacker to execute system commands as root.
Who is affected
Users of D-Link DIR-859 routers connected to the local network.
Urgency
Remediation is critical due to the active exploitation of this vulnerability.
Action
Apply the latest firmware update from D-Link.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2023-06-29
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2019-17621

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2019-17621coverage & exploitation statusNVD · CVE.org

Recent advisories for D-Link DIR-859 Router

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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