CVE-2019-9556: FiberHome an5506-04-f RP2669 devices have XSS.

This month

MEDIUM 5.4MITIGATE

CVE-2019-9556 is a medium-severity flaw (CVSS 5.4) affecting an5506-04-f firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

FiberHome an5506-04-f RP2669 devices have XSS.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-79
Published	2019-12-31
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: fiberhomegroup

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-12-31 17:15 UTCPublished CVE record published
2026-06-17 02:43 UTCUpdated Record last modified

fiberhomegroup an5506-04-f firmware MITIGATE

Affected: rp2669

Fixed in: no fixed release known

Safe to downgrade to: a release before rp2669

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Fiberhome AN5506-04-F RP2669 - Persistent Cross-Site Scripting

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-9556?

an5506-04-f firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-9556 being exploited?

CVE-2019-9556 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-9556 affect?

CVE-2019-9556 affects an5506-04-f firmware. Severity is medium (CVSS 5.4). FiberHome an5506-04-f RP2669 devices have XSS.

How urgent is CVE-2019-9556?

Priority 40/100. Public exploit reference

Related CVEs

CVE-2021-42912 HIGH 8.8 MITIGATE MITIGATE FiberHome ONU GPON AN5506-04-F RP2617 is affected by an OS command injection vulnerability

References

← Back to latest CVEs