CVE-2021-42912 (GCVE-0-2021-42912)

Vulnerability from cvelistv5 – Published: 2021-12-16 16:54 – Updated: 2026-07-09 00:15
VLAI Shadowserver KEVIntel
Summary
FiberHome ONU GPON AN5506-04-F RP2617 is affected by an OS command injection vulnerability. This vulnerability allows the attacker, once logged in, to send commands to the operating system as the root user via the ping diagnostic tool, bypassing the IP address field, and concatenating OS commands with a semicolon.
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
  • n/a
Assigner
References
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 37c0d273-023d-4764-92e2-b7dfef370cc6

Vulnerability ID: CVE-2021-42912

Status: Confirmed

Status Updated: 2024-12-20 04:21 UTC

Exploited: Yes

Characteristics
Severity: 88.0
Timestamps
First Seen: 2024-12-20
Asserted: 2024-12-20
Last Seen: 2024-12-20
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: FiberHome / FiberHome ONU GPON AN550 | Class: router | Severity: High (CVSS 8.8) | IoT: yes | In CISA KEV: no | Honeypot connections on 2024-12-20: 8
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 1
Iot yes
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class router
7D Avg 0
Vendor FiberHome
30D Avg 0
90D Avg 0
Product FiberHome ONU GPON AN550
Cisa Kev no
Connections 8
Observation Date 2024-12-20
Vulnerability Class CVSS
Vulnerability Score 8.8
Vulnerability Severity High
References
Created: 2026-06-30 12:07 UTC | Updated: 2026-06-30 12:07 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 9ae962f2-2e8f-4629-a386-b76232c732a7

Vulnerability ID: CVE-2021-42912

Status: Confirmed

Status Updated: 2021-12-16 16:54 UTC

Exploited: Yes

Timestamps
First Seen: 2021-12-16
Asserted: 2021-12-16
Scope
Notes: KEVIntel entry: FiberHome ONU GPON AN5506-04-F RP2617 is affected by an OS command injection vulnerability. This vulnerability allows the attacker, once logged in,... | Affected: n/a / n/a | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title FiberHome ONU GPON AN5506-04-F RP2617 is affected by an OS command injection vulnerability. This vulnerability allows the attacker, once logged in,...
Vendor n/a
Product n/a
Added Date 2021-12-16T16:54:08.000Z
Cvss Score None
Epss Score None
Cvss Severity None
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-06-23 14:06 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.