CVE-2020-12447: A Local File Inclusion (LFI) issue on Onkyo TX-NR585 1000-0000-000-0008-0000 devices allows remote unauthentic

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HIGH 7.5REMOTEMITIGATE

CVE-2020-12447 is a high-severity flaw (CVSS 7.5) affecting tx-nr585 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Local File Inclusion (LFI) issue on Onkyo TX-NR585 1000-0000-000-0008-0000 devices allows remote unauthenticated users on the network to read sensitive files via %2e%2e%2f directory traversal, as demonstrated by reading /etc/shadow.

Why this priority

High severity
EPSS top 4%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	13.7% (top 4%)
CISA exploited list	No
Weakness	CWE-22
Published	2020-04-29
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: onkyo

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

Am I affected?

Timeline

2020-04-29 03:15 UTCPublished CVE record published
2026-06-17 02:51 UTCUpdated Record last modified

onkyo tx-nr585 firmware MITIGATE

Affected: 1000-0000-000-0008-0000

Fixed in: no fixed release known

Safe to downgrade to: a release before 1000-0000-000-0008-0000

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.

Nuclei scan template: Onkyo TX-NR585 Web Interface - Directory Traversal

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-2020-12447?

tx-nr585 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-12447 being exploited?

CVE-2020-12447 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-2020-12447 affect?

CVE-2020-12447 affects tx-nr585 firmware. Severity is high (CVSS 7.5). A Local File Inclusion (LFI) issue on Onkyo TX-NR585 1000-0000-000-0008-0000 devices allows remote unauthenticated users on the network to read sensitive files via %2e%2e%2f directory traversal, as demonstrated by reading /etc/shadow.

How urgent is CVE-2020-12447?

Priority 60/100. High severity; EPSS top 4%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

References

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