CVE-2020-11086: Out-of-bounds Read in FreeRDP `ntlm_read_ntlm_v2_response`

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-05-29 · updated 2026-06-17
Weakness: CWE-125

Description

In FreeRDP less than or equal to 2.0.0, there is an out-of-bound read in ntlm_read_ntlm_v2_client_challenge that reads up to 28 bytes out-of-bound to an internal structure. This has been fixed in 2.1.0.

Affected products

Debian Linux: 10.0
FreeRDP: before 2.1.0 — fixed in 2.1.0
openSUSE Leap: 15.1

How to fix

Upgrade to a fixed version: FreeRDP 2.1.0. Check the vendor advisory for mitigations.

References

http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00080.html
https://github.com/FreeRDP/FreeRDP/commit/c098f21fdaadca57ff649eee1674f6cc321a2ec4
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-fg8v-w34r-c974
https://lists.debian.org/debian-lts-announce/2023/10/msg00008.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00080.html
https://github.com/FreeRDP/FreeRDP/commit/c098f21fdaadca57ff649eee1674f6cc321a2ec4
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-fg8v-w34r-c974
https://lists.debian.org/debian-lts-announce/2023/10/msg00008.html

Get alerted when CVE-2020-11086 or the next vulnerability affects your stack