CVE-2021-42912Public exploitNetwork attack vector

Authenticated root command execution via ping input

Published Dec 16, 2021 · Updated Jul 9, 2026

OS command injection in FiberHome AN5506-04-F RP2617 allows remote authenticated users to execute commands as root through ping diagnostics. The ping_ip field on /application/ping_diagnosis.asp reaches the server-side ping command without rejecting shell metacharacters, so semicolon-delimited input invokes additional commands. Access to the management interface and a valid login are required, after which injected commands run with root privileges and can fully control the device.

CVSS severity8.8
High
EPSS probability10.09%
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 FiberHome AN5506-04-F RP2617 allows remote authenticated users to execute commands as root through ping diagnostics. The ping_ip field on /application/ping_diagnosis.asp reaches the server-side ping command without rejecting shell metacharacters, so semicolon-delimited input invokes additional commands. Access to the management interface and a valid login are required, after which injected commands run with root privileges and can fully control the device.

The record

CVE
CVE-2021-42912
Published
Dec 16, 2021
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-78, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 16, 2021CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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.

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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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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