CVE-2020-28946: An improper webserver configuration on Plum IK-401 devices with firmware before 1.02 allows an attacker (with

Q: How do I fix CVE-2020-28946?

ik-401 firmware: upgrade to 1.02. Exact commands for each OS are on this page.

Q: Is CVE-2020-28946 being exploited?

CVE-2020-28946 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-2020-28946 affect?

CVE-2020-28946 affects ik-401 firmware. Severity is high (CVSS 7.5). An improper webserver configuration on Plum IK-401 devices with firmware before 1.02 allows an attacker (with network access to the device) to obtain the configuration file, including hashed credential data. Successful exploitation could al

Q: How urgent is CVE-2020-28946?

Priority 53/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2020-28946 is a high-severity flaw (CVSS 7.5) affecting ik-401 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An improper webserver configuration on Plum IK-401 devices with firmware before 1.02 allows an attacker (with network access to the device) to obtain the configuration file, including hashed credential data. Successful exploitation could allow access to hashed credential data with a single unauthenticated GET request.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 31%)
CISA exploited list	No
Weakness	CWE-306
Published	2020-12-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: plummac

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

Am I affected?

Timeline

2020-12-08 20:15 UTCPublished CVE record published
2026-06-17 03:10 UTCUpdated Record last modified

plummac ik-401 firmware UPGRADE

Affected: < 1.02

Fixed in: 1.02

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-2020-28946?

ik-401 firmware: upgrade to 1.02. Exact commands for each OS are on this page.

Is CVE-2020-28946 being exploited?

CVE-2020-28946 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-2020-28946 affect?

CVE-2020-28946 affects ik-401 firmware. Severity is high (CVSS 7.5). An improper webserver configuration on Plum IK-401 devices with firmware before 1.02 allows an attacker (with network access to the device) to obtain the configuration file, including hashed credential data. Successful exploitation could al

How urgent is CVE-2020-28946?

Priority 53/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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