CVE-2020-17383: A directory traversal vulnerability on Telos Z/IP One devices through 4.0.0r grants an unauthenticated individ

Q: How do I fix CVE-2020-17383?

z\/ip one firmware: upgrade to newer than 4.0.0r. Exact commands for each OS are on this page.

Q: Is CVE-2020-17383 being exploited?

CVE-2020-17383 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-17383 affect?

CVE-2020-17383 affects z\/ip one firmware. Severity is critical (CVSS 9.8). A directory traversal vulnerability on Telos Z/IP One devices through 4.0.0r grants an unauthenticated individual root level access to the device's file system. This can be used to identify configuration settings, password hashes for built-

Q: How urgent is CVE-2020-17383?

Priority 67/100. Critical severity; EPSS top 9%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2020-17383 is a critical-severity flaw (CVSS 9.8) affecting z\/ip one firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A directory traversal vulnerability on Telos Z/IP One devices through 4.0.0r grants an unauthenticated individual root level access to the device's file system. This can be used to identify configuration settings, password hashes for built-in accounts, and the cleartext password for remote configuration of the device through the WebUI.

Why this priority

Critical severity
EPSS top 9%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	4.3% (top 9%)
CISA exploited list	No
Weakness	CWE-22
Published	2022-01-24
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: telosalliance

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

Am I affected?

Timeline

2022-01-24 20:15 UTCPublished CVE record published
2026-06-17 02:58 UTCUpdated Record last modified

telosalliance z\/ip one firmware UPGRADE

Affected: <= 4.0.0r

Fixed in: newer than 4.0.0r

Safe to downgrade to: no unaffected older release

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.

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-2020-17383?

z\/ip one firmware: upgrade to newer than 4.0.0r. Exact commands for each OS are on this page.

Is CVE-2020-17383 being exploited?

CVE-2020-17383 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-2020-17383 affect?

CVE-2020-17383 affects z\/ip one firmware. Severity is critical (CVSS 9.8). A directory traversal vulnerability on Telos Z/IP One devices through 4.0.0r grants an unauthenticated individual root level access to the device's file system. This can be used to identify configuration settings, password hashes for built-

How urgent is CVE-2020-17383?

Priority 67/100. Critical severity; EPSS top 9%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

References

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