NVD / CVE Program· CNA mitre

CVE-2019-16920: Unauthenticated remote code execution occurs in D-Link products such as DIR-655C, DIR-866L, DIR-652, and DHP-1565.

Noroxi assessment

Priority: Now (action score 99/100)

CISA has confirmed exploitation in the wild (Mar 25, 2022). Remediation deadline for US federal agencies: Apr 15, 2022.
A ready-made attack module is public (Nuclei); exploiting it takes no special expertise.
Probability of exploitation in the next 30 days: 99.9% (FIRST EPSS); higher than 99.9% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to CISA the attack is automatable: targets can be found by mass scanning.
According to the record, no fixed version is available yet.
Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Patch today or shut off access. Until a fix is released, restrict access to the affected component and follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS

Unauthenticated remote code execution occurs in D-Link products such as DIR-655C, DIR-866L, DIR-652, and DHP-1565. The issue occurs when the attacker sends an arbitrary input to a "PingTest" device common gateway interface that could lead to common injection. An attacker who successfully triggers the command injection could achieve full system compromise. Later, it was independently found that these are also affected: DIR-855L, DAP-1533, DIR-862L, DIR-615, DIR-835, and DIR-825.

CriticalCVSS 9.8 · v3.1KEVWeaponized No fix recorded

BDU:2019-04537

Published: Sep 27, 2019
Updated: Jun 16, 2026
EPSS: 99.9% · 99th percentile
CWE: CWE-78

Report tools

JSON

Action score

Now

Patch today or shut off access.

CVSS: 39 / 40 · 9.8 / 10
CISA KEV: 30 / 30 · Listed
EPSS: 30 / 30 · 99.9%

CISA SSVC decision

Exploitation: active
Automatable: yes
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Mar 25, 2022. That signals real attacks, not theory.

Remediation deadline for US federal agencies: Apr 15, 2022.

Get told when this record changes

In CISA KEV: exploitation in the wild confirmed
Weaponized exploit exists
No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
dlink	dir-655 firmware	cpe:2.3:o:dlink:dir-655_firmware
dlink	dir-655	cpe:2.3:h:dlink:dir-655
dlink	dir-866l firmware	cpe:2.3:o:dlink:dir-866l_firmware
dlink	dir-866l	cpe:2.3:h:dlink:dir-866l
dlink	dir-652 firmware	cpe:2.3:o:dlink:dir-652_firmware
dlink	dir-652	cpe:2.3:h:dlink:dir-652
dlink	dhp-1565 firmware	cpe:2.3:o:dlink:dhp-1565_firmware
dlink	dhp-1565	cpe:2.3:h:dlink:dhp-1565
dlink	dir-855l firmware	cpe:2.3:o:dlink:dir-855l_firmware
dlink	dir-855l	cpe:2.3:h:dlink:dir-855l
dlink	dap-1533 firmware	cpe:2.3:o:dlink:dap-1533_firmware
dlink	dap-1533	cpe:2.3:h:dlink:dap-1533

and 8 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

dlink dap-1533 firmwareall versions
dlink dhp-1565 firmwareup to 1.01 inclusive
dlink dir-615 firmwareall versions
dlink dir-652 firmwareall versions
dlink dir-655 firmwareup to 3.02b05 inclusive
dlink dir-825 firmwareall versions
dlink dir-835 firmwareall versions
dlink dir-855l firmwareall versions
dlink dir-862l firmwareall versions
dlink dir-866l firmwareup to 1.03b04 inclusive

Same product

dlink: all records

Other highest-scoring records for the same primary product.

CVE-2019-13561D-Link DIR-655 C devices before 3.02B05 BETA03 allow remote attackers to execute arbitrary commands via shell metacharacters in the online_f
42Plan
CVE-2019-13560D-Link DIR-655 C devices before 3.02B05 BETA03 allow remote attackers to force a blank password via the apply_sec.cgi setup_wizard parameter
40Plan
CVE-2019-13563D-Link DIR-655 C devices before 3.02B05 BETA03 allow CSRF for the entire management console.
35Monitor

Published before and after this one in the same product

← EarlierCVE-2019-13562Jul 11, 2019 · D-Link DIR-655 C devices before 3.02B05 BETA03 allow XSS, as demonstrated by the /www/ping_response.cgi ping_ipaddr parameter, the /www/ping
25Monitor
Later →CVE-2025-6158Jun 17, 2025 · D-Link DIR-665 HTTP POST Request sub_AC78 stack-based overflow
29Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

Nuclei detection template ×1
Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
Source	Kind	Date
Nuclei detection template	Nuclei template CVE-2019-16920	—
Proof-of-concept repository on GitHub	stars:1	2019-10-16

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

PublishedSep 27, 2019
First PoCOct 16, 2019+19 d
CISA KEVMar 25, 2022+910 d
TodayNov 3, 2026+2594 d

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-19-226 · Oct 24, 2019(D-Link Modem Zafiyeti)
TR-19-179 · Oct 2, 2019(D-Link Modem Zafiyeti)

All national notices →

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Root cause

User input is inserted as text into a shell command. The shell may interpret special characters in the input as part of the command.

The bug in code

The whole CWE-78 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1const host = req.body.host;
2exec("ping -c 1 " + host, onResult);

Fixed

1const host = req.body.host;
2if (!/^[a-z0-9.-]{1,253}$/i.test(host)) return res.sendStatus(400);
3execFile("ping", ["-c", "1", host], onResult);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

fortiguard.com/zeroday/FG-VD-19-117

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records