CVE-2021-28143Public exploit

Authenticated command injection via ping host

Published Mar 11, 2021 · Updated Aug 3, 2024

Command injection in D-Link DIR-841 firmware 3.03 and 3.04 allows remote authenticated users on the LAN to execute arbitrary commands via /jsonrpc. The endpoint passes the host parameter from System Tools ping, ping6, and traceroute requests into command execution without neutralizing shell metacharacters. Administrative web-interface authentication and LAN access are required, and successful exploitation can provide control of router internals with confidentiality, integrity, and availability impact.

CVSS severity7.7
High
EPSS probability45.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in D-Link DIR-841 firmware 3.03 and 3.04 allows remote authenticated users on the LAN to execute arbitrary commands via /jsonrpc. The endpoint passes the host parameter from System Tools ping, ping6, and traceroute requests into command execution without neutralizing shell metacharacters. Administrative web-interface authentication and LAN access are required, and successful exploitation can provide control of router internals with confidentiality, integrity, and availability impact.

The record

CVE
CVE-2021-28143
Published
Mar 11, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-78, T1059.004
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 11, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.0NVDCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.7NVDAV:A/AC:L/Au:S/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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