CVE-2020-21935Public exploitNetwork attack vector

Arbitrary command execution via HNAP1 diagnostic input

Published Jul 21, 2021 · Updated Aug 4, 2024

Command injection in Motorola CX2 firmware 1.0.2 Build 20190508 Rel.97360n allows remote attackers to execute arbitrary commands through HNAP1. The HNAP1/GetNetworkTomographySettings handler accepts a command-bearing diagnostic value after browser-side validation is bypassed and executes the resulting input as a system command. The service is network reachable; the public reproduction uses a router session and bypasses only client-side validation before submitting the command, so successful exploitation can compromise router confidentiality, integrity, and availability.

CVSS severity9.8
Critical
EPSS probability4.37%
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 Motorola CX2 firmware 1.0.2 Build 20190508 Rel.97360n allows remote attackers to execute arbitrary commands through HNAP1. The HNAP1/GetNetworkTomographySettings handler accepts a command-bearing diagnostic value after browser-side validation is bypassed and executes the resulting input as a system command. The service is network reachable; the public reproduction uses a router session and bypasses only client-side validation before submitting the command, so successful exploitation can compromise router confidentiality, integrity, and availability.

The record

CVE
CVE-2020-21935
Published
Jul 21, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-78, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 21, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command (OS 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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