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Fencer Intel
medium 5.5

CVE-2020-11047 json

Out-of-bounds Read in FreeRDP

published 6y ago modified 4mo ago also EUVD-2020-3431

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 76%
public exploits
0
none known

Summary

In FreeRDP after 1.1 and before 2.0.0, there is an out-of-bounds read in autodetect_recv_bandwidth_measure_results. A malicious server can extract up to 8 bytes of client memory with a manipulated message by providing a short input and reading the measurement result data. This has been patched in 2.0.0.

Patch / fix

  • freerdp freerdp 2.0.0
  • freerdp2 Debian 12 2.1.1+dfsg1-1

debian advisories DEBIAN-CVE-2020-11047

  • 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-2020-11047

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

  • 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

  • freerdp Arch Linux 2:2.0.0-1

arch linux advisories AVG-1131

Is CVE-2020-11047 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2020-11047 updated cvss 5.9

freerdp: out-of-bounds read in autodetect_recv_bandwidth_measure_results function

  • Red Hat Enterprise Linux 6 freerdp, freerdp-libs, freerdp-plugins
    affected: no fix planned “Out of support scope”
  • 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 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 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

1.65% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/FreeRDP/FreeRDP/issues/6009 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.5 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L
NVD 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:H
NVD 2.0 4.9 AV:N/AC:M/Au:S/C:P/I:N/A:P

Affected products

  • FreeRDP FreeRDP

Classification

Weakness

References

Sources

Fencer Intel 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.