Skip to main content
ExploitedNot in CISA KEV yet

CVE-2021-42912

Exploitation confirmed. First attested on 2021-12-16 by GCVE · previdian, GCVE · shadowserver.

  • Published2021-12-16
  • WeaknessCWE-78

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2021-12-1616:54Listed as exploited by GCVEGCVE
  2. 2021-12-1617:15CVE publishedNVD
  3. 2024-12-2004:21Exploitation first reportedGCVE

Versions per branch

NVD
Fiberhome an5506-02-b firmwareversion to verify
BranchAffectedFixed in
—= rp2520no fix published
—= rp2521no fix published
—= rp2603no fix published
Fiberhome aan5506-04-g2g firmwareversion to verify
BranchAffectedFixed in
—= rp2560no fix published
Fiberhome an5506-01-a firmwareversion to verify
BranchAffectedFixed in
—= rp0509no fix published

3 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2021-12-16
Last Modified
2026-07-09
NVD status
Modified
GitHub Advisory
GHSA-hcfv-5p8h-vvh5

Frequently asked questions

What is 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.

Is CVE-2021-42912 actively exploited?

Active exploitation of CVE-2021-42912 has not been confirmed. Its EPSS score was 10.1% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-42912?

CVE-2021-42912 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Hear about the next vulnerability in your software

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this productCISA KEV additions, November 2026Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database

Sources for this record