CVE-2021-42912

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.

Published: 2021-12-16 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-42912 is rated Moderate Risk (43/100): CVSS High severity, with low exploitation likelihood (EPSS 0.10%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-42912

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-12-27 1.93% 0.10% -1.84%
2 2025-12-04 3.44% 1.93% -1.51%
3 2025-11-21 — 3.44% —

Full EPSS history (30 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-42912

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
9.0 2.0 HIGH
AV:N/AC:L/Au:S/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.0 10.0 [email protected]

Weakness enumeration for CVE-2021-42912

Affected software / configurations for CVE-2021-42912

Vendor Product Version Raw CPE
fiberhome an5506-01-a_firmware rp0509 cpe:2.3:o:fiberhome:an5506-01-a_firmware:rp0509:*:*:*:*:*:*:*
fiberhome an5506-01-b_firmware rp2610 cpe:2.3:o:fiberhome:an5506-01-b_firmware:rp2610:*:*:*:*:*:*:*
fiberhome an5506-02-b_firmware rp2520 cpe:2.3:o:fiberhome:an5506-02-b_firmware:rp2520:*:*:*:*:*:*:*
fiberhome an5506-02-b_firmware rp2521 cpe:2.3:o:fiberhome:an5506-02-b_firmware:rp2521:*:*:*:*:*:*:*
fiberhome an5506-02-b_firmware rp2603 cpe:2.3:o:fiberhome:an5506-02-b_firmware:rp2603:*:*:*:*:*:*:*
fiberhome an5506-04-b_firmware rp2510 cpe:2.3:o:fiberhome:an5506-04-b_firmware:rp2510:*:*:*:*:*:*:*
fiberhome an5506-04-f_firmware rp2617 cpe:2.3:o:fiberhome:an5506-04-f_firmware:rp2617:*:*:*:*:*:*:*
fiberhome aan5506-04-g2g_firmware rp2560 cpe:2.3:o:fiberhome:aan5506-04-g2g_firmware:rp2560:*:*:*:*:*:*:*

References for CVE-2021-42912

cvelogic Threat Intelligence