CVE-2019-20216: D-Link DIR-859 1.05 and 1.06B01 Beta01 devices allow remote attackers to execute arbitrary OS commands via the

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CRITICAL 9.8REMOTEMITIGATE

CVE-2019-20216 is a critical-severity flaw (CVSS 9.8) affecting dir-859 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

D-Link DIR-859 1.05 and 1.06B01 Beta01 devices allow remote attackers to execute arbitrary OS commands via the urn: to the M-SEARCH method in ssdpcgi() in /htdocs/cgibin, because REMOTE_PORT is mishandled. The value of the urn: service/device is checked with the strstr function, which allows an attacker to concatenate arbitrary commands separated by shell metacharacters.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.7% (top 10%)
CISA exploited list	No
Weakness	CWE-78
Published	2020-01-29
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: dlink

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-01-29 03:15 UTCPublished CVE record published
2026-06-17 02:30 UTCUpdated Record last modified

dlink dir-859 firmware MITIGATE

Affected: 1.05 · 1.06b01 beta01

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.05

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-20216?

dir-859 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-20216 being exploited?

CVE-2019-20216 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-20216 affect?

CVE-2019-20216 affects dir-859 firmware. Severity is critical (CVSS 9.8). D-Link DIR-859 1.05 and 1.06B01 Beta01 devices allow remote attackers to execute arbitrary OS commands via the urn: to the M-SEARCH method in ssdpcgi() in /htdocs/cgibin, because REMOTE_PORT is mishandled. The value of the urn: service/devi

How urgent is CVE-2019-20216?

Priority 62/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

D-Link vulnerabilities

Related CVEs

CVE-2024-0769 MEDIUM 5.3 EXPLOITED MITIGATE D-Link DIR-859 Router Path Traversal Vulnerability
CVE-2023-36092 CRITICAL 9.8 MITIGATE Authentication Bypass vulnerability in D-Link DIR-859 FW105b03 allows remote attackers to gain escalated privi
CVE-2022-25106 MEDIUM 5.5 MITIGATE MITIGATE D-Link DIR-859 v1.05 was discovered to contain a stack-based buffer overflow via the function genacgi_main
CVE-2019-20217 CRITICAL 9.8 MITIGATE D-Link DIR-859 1.05 and 1.06B01 Beta01 devices allow remote attackers to execute arbitrary OS commands via the
CVE-2019-20215 CRITICAL 9.8 MITIGATE D-Link DIR-859 1.05 and 1.06B01 Beta01 devices allow remote attackers to execute arbitrary OS commands via a u

References

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