What’s Vulnerable › Vulnerabilities

CVE-2020-4031: Use-After-Free in gdi_SelectObject in FreeRDP

• 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: 2020-06-22 · updated 2026-06-17
• Weakness: CWE-416

Description

In FreeRDP before version 2.1.2, there is a use-after-free in gdi_SelectObject. All FreeRDP clients using compatibility mode with /relax-order-checks are affected. This is fixed in version 2.1.2.

Affected products

• Canonical Ubuntu Linux: 18.04, 20.04
• Debian Linux: 10.0
• Fedoraproject Fedora: 31, 32
• FreeRDP: before 2.1.2 — fixed in 2.1.2
• openSUSE Leap: 15.1

How to fix

Upgrade to a fixed version: FreeRDP 2.1.2. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00080.html
• http://www.freerdp.com/2020/06/22/2_1_2-released
• https://github.com/FreeRDP/FreeRDP/commit/6d86e20e1e7caaab4f0c7f89e36d32914dbccc52
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-gwcq-hpq2-m74g
• https://lists.debian.org/debian-lts-announce/2023/10/msg00008.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6Y35HBHG2INICLSGCIKNAR7GCXEHQACQ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XOZLH35OJWIQLM7FYDXAP2EAUBDXE76V/
• https://usn.ubuntu.com/4481-1/
• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00080.html
• http://www.freerdp.com/2020/06/22/2_1_2-released
• https://github.com/FreeRDP/FreeRDP/commit/6d86e20e1e7caaab4f0c7f89e36d32914dbccc52
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-gwcq-hpq2-m74g

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