CVE-2019-17621

Exp

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 to the local network.

Published: 2019-12-30 Last update: 2025-11-07 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-17621 is rated Critical Active Threat (95.7/100): CVSS Critical severity, with high exploitation likelihood (EPSS 89.62%, 100th percentile). CISA KEV confirms active exploitation (added 2023-06-29) affecting D-Link / DIR-859 Router. a weakness (CWE-78) Unauthenticated remote administrative access may be possible. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2019-17621

Name: D-Link DIR-859 Router Command Execution Vulnerability · CISA KEV detail

Exploit added: 2023-06-29

Action due: 2023-07-20

Required action: Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.

Public exploit references (Exploit-DB) for CVE-2019-17621

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2019-17621

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 93.01% 89.62% -3.38%
2 2026-02-18 93.30% 93.01% -0.29%
3 2025-11-21 — 93.30% —

Full EPSS history (29 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-17621

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0
10.0 2.0 HIGH
AV:N/AC:L/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 10.0 [email protected]

Weakness enumeration for CVE-2019-17621

Affected software / configurations for CVE-2019-17621

Vendor Product Version Raw CPE
dlink dir-859_firmware <= 1.05b03 cpe:2.3:o:dlink:dir-859_firmware:*:*:*:*:*:*:*:*
dlink dir-859_firmware 1.06b01 cpe:2.3:o:dlink:dir-859_firmware:1.06b01:beta1:*:*:*:*:*:*
dlink dir-822_firmware <= 2.03b01 cpe:2.3:o:dlink:dir-822_firmware:*:*:*:*:*:*:*:*
dlink dir-822_firmware <= 3.12b04 cpe:2.3:o:dlink:dir-822_firmware:*:*:*:*:*:*:*:*
dlink dir-823_firmware <= 1.00b06 cpe:2.3:o:dlink:dir-823_firmware:*:*:*:*:*:*:*:*
dlink dir-823_firmware 1.00b06 cpe:2.3:o:dlink:dir-823_firmware:1.00b06:beta:*:*:*:*:*:*
dlink dir-865l_firmware <= 1.07b01 cpe:2.3:o:dlink:dir-865l_firmware:*:*:*:*:*:*:*:*
dlink dir-868l_firmware <= 1.12b04 cpe:2.3:o:dlink:dir-868l_firmware:*:*:*:*:*:*:*:*
dlink dir-868l_firmware <= 2.05b02 cpe:2.3:o:dlink:dir-868l_firmware:*:*:*:*:*:*:*:*
dlink dir-869_firmware <= 1.03b02 cpe:2.3:o:dlink:dir-869_firmware:*:*:*:*:*:*:*:*
dlink dir-869_firmware 1.03b02 cpe:2.3:o:dlink:dir-869_firmware:1.03b02:beta02:*:*:*:*:*:*
dlink dir-880l_firmware <= 1.08b04 cpe:2.3:o:dlink:dir-880l_firmware:*:*:*:*:*:*:*:*
dlink dir-890l_firmware <= 1.11b01 cpe:2.3:o:dlink:dir-890l_firmware:*:*:*:*:*:*:*:*
dlink dir-890l_firmware 1.11b01 cpe:2.3:o:dlink:dir-890l_firmware:1.11b01:beta01:*:*:*:*:*:*
dlink dir-890r_firmware <= 1.11b01 cpe:2.3:o:dlink:dir-890r_firmware:*:*:*:*:*:*:*:*
dlink dir-890r_firmware 1.11b01 cpe:2.3:o:dlink:dir-890r_firmware:1.11b01:beta01:*:*:*:*:*:*
dlink dir-885l_firmware <= 1.12b05 cpe:2.3:o:dlink:dir-885l_firmware:*:*:*:*:*:*:*:*
dlink dir-885r_firmware <= 1.12b05 cpe:2.3:o:dlink:dir-885r_firmware:*:*:*:*:*:*:*:*
dlink dir-895l_firmware <= 1.12b10 cpe:2.3:o:dlink:dir-895l_firmware:*:*:*:*:*:*:*:*
dlink dir-895r_firmware <= 1.12b10 cpe:2.3:o:dlink:dir-895r_firmware:*:*:*:*:*:*:*:*
dlink dir-818lx_firmware — cpe:2.3:o:dlink:dir-818lx_firmware:-:*:*:*:*:*:*:*

References for CVE-2019-17621

URL Tags
http://packetstormsecurity.com/files/156054/D-Link-DIR-859-Unauthenticated-Remote-Command-Execution.html Exploit Third Party Advisory VDB Entry
https://medium.com/%40s1kr10s/d-link-dir-859-rce-unautenticated-cve-2019-17621-en-d94b47a15104 Exploit Third Party Advisory
https://medium.com/%40s1kr10s/d-link-dir-859-rce-unautenticated-cve-2019-17621-es-fad716629ff9 Broken Link
https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10146 Patch Vendor Advisory
https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10147 Patch Vendor Advisory
https://www.dlink.com/en/security-bulletin Vendor Advisory
https://www.ftc.gov/system/files/documents/cases/dlink_proposed_order_and_judgment_7-2-19.pdf Third Party Advisory US Government Resource
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-17621 US Government Resource
cvelogic Threat Intelligence