What’s Vulnerable › Vulnerabilities

CVE-2021-28117

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-03-20 · updated 2026-06-17

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.)

Affected products

• KDE Discover: before 5.21.3 — fixed in 5.21.3

How to fix

Upgrade to a fixed version: KDE Discover 5.21.3. Check the vendor advisory for mitigations.

References

• https://github.com/KDE/discover/commit/fcd3b30552bf03a384b1a16f9bb8db029c111356
• https://github.com/KDE/discover/releases
• https://invent.kde.org/plasma/discover/commit/94478827aab63d2e2321f0ca9ec5553718798e60
• https://kde.org/info/security/advisory-20210310-1.txt
• https://userbase.kde.org/Discover
• https://github.com/KDE/discover/commit/fcd3b30552bf03a384b1a16f9bb8db029c111356
• https://github.com/KDE/discover/releases
• https://invent.kde.org/plasma/discover/commit/94478827aab63d2e2321f0ca9ec5553718798e60
• https://kde.org/info/security/advisory-20210310-1.txt
• https://userbase.kde.org/Discover

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