Cyber Resilience

CVE-2021-42912

HighRCE

Published: 16 December 2021

Published
16 December 2021
Modified
21 November 2024
KEV Added
—
Patch
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CVSS Score v3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0010 26.7th percentile
Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-42912 is a high-severity OS Command Injection (CWE-78) vulnerability in Fiberhome An5506-02-B Firmware. Its CVSS base score is 8.8 (High).

Operationally, ranked at the 26.7th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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…

more

address field, and concatenating OS commands with a semicolon.

CWE(s)
CWE-78

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

fiberhome
an5506-01-a firmware
rp0509
fiberhome
an5506-01-b firmware
rp2610
fiberhome
an5506-02-b firmware
rp2520, rp2521, rp2603
fiberhome
an5506-04-b firmware
rp2510
fiberhome
an5506-04-f firmware
rp2617
fiberhome
aan5506-04-g2g firmware
rp2560

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-27 Platform-independent Applications
addresses: CWE-78

Platform-independent apps typically execute inside a managed runtime or sandbox that restricts direct OS command execution, reducing the ability to exploit OS command injection.

SI-10 Information Input Validation
addresses: CWE-78

Validates inputs to block special elements that would alter OS command execution.

References