CVE-2021-29379Public exploit

Arbitrary command execution via SSDP Search Target

Published Apr 12, 2021 · Updated Aug 3, 2024

OS command injection in D-Link DIR-802 A1 through 1.00b05 allows remote attackers to execute arbitrary commands via SSDP M-SEARCH. The default UPnP service on UDP port 1900 interprets attacker-controlled content in the SSDP Search Target field as an operating-system command. Any unauthenticated user able to send packets from the router's local network can open a Telnet service or run other commands with the service's privileges.

CVSS severity8.8
High
EPSS probability3.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in D-Link DIR-802 A1 through 1.00b05 allows remote attackers to execute arbitrary commands via SSDP M-SEARCH. The default UPnP service on UDP port 1900 interprets attacker-controlled content in the SSDP Search Target field as an operating-system command. Any unauthenticated user able to send packets from the router's local network can open a Telnet service or run other commands with the service's privileges.

The record

CVE
CVE-2021-29379
Published
Apr 12, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-78, CAPEC-88, T1059
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 12, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.8NIST NVDAV:A/AC:L/Au:N/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CAPEC-88OS Command Injection
T1059Command and Scripting Interpreter

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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