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Fencer Vulns
low 2.2

CVE-2020-11040 json

Out-of-bounds Read in FreeRDP

published 2020-05-29 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-3424

cvss
2.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.5%
EPSS 1.5% chance of exploitation in 30 days, percentile 75%
public exploits
0
none known

Summary

In FreeRDP less than or equal to 2.0.0, there is an out-of-bound data read from memory in clear_decompress_subcode_rlex, visualized on screen as color. This has been patched in 2.1.0.

Patch / fix

  • freerdp freerdp 2.1.0
  • freerdp2 Debian 12 2.1.1+dfsg1-1

debian advisories DEBIAN-CVE-2020-11040

  • freerdp2 Ubuntu 18.04 LTS 2.1.1+dfsg1-0ubuntu0.18.04.1
  • freerdp2 Ubuntu 20.04 LTS 2.1.1+dfsg1-0ubuntu0.20.04.1

ubuntu advisories UBUNTU-CVE-2020-11040

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • freerdp RHEL 8 2:2.1.1-1.el8
  • vinagre RHEL 8 3.22.0-23.el8
  • libwinpr RHEL 8 2:2.1.1-1.el8
  • freerdp-libs RHEL 8 2:2.1.1-1.el8
  • freerdp RHEL 7 2.1.1-2.el7
  • libwinpr RHEL 7 2.1.1-2.el7
  • freerdp-libs RHEL 7 2.1.1-2.el7

red hat advisories RHSA-2020:4647RHSA-2020:4031

  • freerdp SLE Workstation Extension 12 SP5, SLE Software Development Kit 12 SP5 2.1.2-12.20.1
  • vinagre SLE Workstation Extension 12 SP5 3.20.2-16.3.3
  • freerdp SLE Workstation Extension 15 SP2 2.1.2-15.7.1
  • freerdp SLE Workstation Extension 15 SP1 2.1.2-10.15.1

suse advisories SUSE-SU-2020:2272-1SUSE-SU-2020:2068-1SUSE-SU-2020:2032-1

  • freerdp2 openSUSE Tumbleweed 2.4.0-2.1
  • freerdp openSUSE Leap 15.1 2.1.2-lp151.5.6.1

opensuse advisories openSUSE-SU-2024:10768-1openSUSE-SU-2020:1090-1

  • vinagre AlmaLinux 8 3.22.0-23.el8

almalinux advisories ALSA-2020:4647

  • vinagre Rocky Linux 8 3.22.0-23.el8

rocky linux advisories RLSA-2020:4647

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-11040 updated cvss 2.7

freerdp: Out of bound access in clear_decompress_subcode_rlex

  • Red Hat Enterprise Linux 6 freerdp, freerdp-libs, freerdp-plugins
    affected: workaround, no fix planned “The flaw can be mitigated by not running the freerdp client with the /gfx connection modes and/or not connecting to untrusted or compromised rdp servers.”
  • Red Hat CodeReady Linux Builder (v. 8) freerdp-devel 2.1.1-1.el8, freerdp-debuginfo 2.1.1-1.el8, libwinpr-debuginfo 2.1.1-1.el8, freerdp-debugsource 2.1.1-1.el8, freerdp-libs-debuginfo 2.1.1-1.el8 Red Hat Enterprise Linux AppStream (v. 8) freerdp 2.1.1-1.el8, libwinpr 2.1.1-1.el8, vinagre 3.22.0-23.el8, freerdp-libs 2.1.1-1.el8
    fixed: vendor fix “The flaw can be mitigated by not running the freerdp client with the /gfx connection modes and/or not connecting to untrusted or compromised rdp servers.” RHSA-2020:4647
  • Red Hat Enterprise Linux Client (v. 7) freerdp 2.1.1-2.el7, libwinpr 2.1.1-2.el7, freerdp-libs 2.1.1-2.el7 Red Hat Enterprise Linux Client Optional (v. 7) freerdp-devel 2.1.1-2.el7, libwinpr-devel 2.1.1-2.el7, freerdp-debuginfo 2.1.1-2.el7 Red Hat Enterprise Linux Server (v. 7) freerdp 2.1.1-2.el7, libwinpr 2.1.1-2.el7, freerdp-libs 2.1.1-2.el7 Red Hat Enterprise Linux Server Optional (v. 7) freerdp-devel 2.1.1-2.el7, libwinpr-devel 2.1.1-2.el7, freerdp-debuginfo 2.1.1-2.el7 Red Hat Enterprise Linux Workstation (v. 7) freerdp 2.1.1-2.el7, libwinpr 2.1.1-2.el7, freerdp-libs 2.1.1-2.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) freerdp-devel 2.1.1-2.el7, libwinpr-devel 2.1.1-2.el7, freerdp-debuginfo 2.1.1-2.el7
    fixed: vendor fix “The flaw can be mitigated by not running the freerdp client with the /gfx connection modes and/or not connecting to untrusted or compromised rdp servers.” RHSA-2020:4031

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.54% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 2.2 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 2.7 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:N/I:N/A:P

Affected products

  • FreeRDP FreeRDP

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.