CVE-2021-28117

Name: CVE-2021-28117
Creator: NVD / NIST
Published: 2021-03-20T21:15:11.827+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.56%

Last modified Jun 17, 2026

CVE-2021-28117 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. libdiscover/backends/KNSBackend/KNSResource.cpp in KDE Discover before 5.21.3 automatically creates links to potentially dangerous URLs (that are neither https:// nor http://) based on the content of the store.kde.org web site. (5.18.7 is also a fixed version.). EPSS estimates a 1.56% chance of exploitation in the next 30 days.

Description

libdiscover/backends/KNSBackend/KNSResource.cpp in KDE Discover before 5.21.3 automatically creates links to potentially dangerous URLs (that are neither https:// nor http://) based on the content of the store.kde.org web site. (5.18.7 is also a fixed version.)

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Probability

1.56%

72.1th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Kde	Discover	< 5.21.3

References

https://github.com/KDE/discover/commit/fcd3b30552bf03a384b1a16f9bb8db029c111356Patch
https://github.com/KDE/discover/releasesThird Party Advisory
https://invent.kde.org/plasma/discover/commit/94478827aab63d2e2321f0ca9ec5553718798e60Patch, Third Party Advisory
https://kde.org/info/security/advisory-20210310-1.txtPatch, Vendor Advisory
https://userbase.kde.org/DiscoverProduct, Vendor Advisory
https://github.com/KDE/discover/commit/fcd3b30552bf03a384b1a16f9bb8db029c111356Patch
https://github.com/KDE/discover/releasesThird Party Advisory
https://invent.kde.org/plasma/discover/commit/94478827aab63d2e2321f0ca9ec5553718798e60Patch, Third Party Advisory
https://kde.org/info/security/advisory-20210310-1.txtPatch, Vendor Advisory
https://userbase.kde.org/DiscoverProduct, Vendor Advisory

Timeline

Published: Mar 20, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-28117?

How severe is CVE-2021-28117?

CVE-2021-28117 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.56% probability of exploitation in the next 30 days.

How do I fix CVE-2021-28117?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-28117?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST