CVE-2020-13962
CVSS v3
7.5
HIGH
EPSS Score
3.0 %
exploit probability, as of 2026-10-19
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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Affected and fixed versions
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Packages
- qt5-qtbase-staticAlmaLinux:8all versions · fixed in 5.12.5-6.el8
- qt5-qttools-staticAlmaLinux:8all versions · fixed in 5.12.5-2.el8
Vendor advisories
qt5: incorrectly calls SSL_shutdown() in OpenSSL mid-handshake causing denial of service in TLS applications
Red Hat Security Advisory: qt5-qtbase and qt5-qtwebsockets security and bug fix update
Description
Qt 5.12.2 through 5.14.2, as used in unofficial builds of Mumble 1.3.0 and other products, mishandles OpenSSL's error queue, which can cause a denial of service to QSslSocket users. Because errors leak in unrelated TLS sessions, an unrelated session may be disconnected when any handshake fails. (Mumble 1.3.1 is not affected, regardless of the Qt version.)
Technical details
- Published
- 2020-06-09
Frequently asked questions
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