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Fencer Vulns
medium 6.6

CVE-2020-11523 json

libfreerdp/gdi/region.c in FreeRDP versions > 1.0 through 2.0.0-rc4 has an Integer Overflow.

published 2020-05-15 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-3876

cvss
6.6
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.0%
EPSS 2.0% chance of exploitation in 30 days, percentile 80%
public exploits
0
none known

Summary

libfreerdp/gdi/region.c in FreeRDP versions > 1.0 through 2.0.0-rc4 has an Integer Overflow.

Patch / fix

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

debian advisories DEBIAN-CVE-2020-11523

  • freerdp Ubuntu 16.04 LTS 1.1.0~git20140921.1.440916e+dfsg1-5ubuntu1.4
  • freerdp Ubuntu 18.04 LTS 1.1.0~git20140921.1.440916e+dfsg1-15ubuntu1.18.04.2
  • 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-2020-11523

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 2:2.0.0-46.rc4.el8_2.1
  • libwinpr RHEL 8 2:2.0.0-46.rc4.el8_2.1
  • freerdp-libs RHEL 8 2:2.0.0-46.rc4.el8_2.1
  • freerdp RHEL 7 2.0.0-4.rc4.el7_8
  • libwinpr RHEL 7 2.0.0-4.rc4.el7_8
  • freerdp-libs RHEL 7 2.0.0-4.rc4.el7_8
  • freerdp RHEL 8.1 EUS 2:2.0.0-46.rc4.el8_1.1
  • libwinpr RHEL 8.1 EUS 2:2.0.0-46.rc4.el8_1.1

red hat advisories RHSA-2020:2354RHSA-2020:2336RHSA-2020:2335RHSA-2020:2334

  • 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

  • freerdp Alpine 3.24, Alpine 3.23, Alpine 3.22 +11 more 2.0.0-r0
  • freerdp2 Alpine 3.24, Alpine 3.23, Alpine 3.22 2.0.0-r0

alpine advisories ALPINE-CVE-2020-11523

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • freerdp Arch Linux 2:2.0.0-1

arch linux advisories AVG-1131

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-2020-11523 updated cvss 6.6

freerdp: Integer overflow in region.c

  • 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 2.0.0-46.rc4.el8_2.1, freerdp-debuginfo 2.0.0-46.rc4.el8_2.1, libwinpr-debuginfo 2.0.0-46.rc4.el8_2.1, freerdp-debugsource 2.0.0-46.rc4.el8_2.1, freerdp-libs-debuginfo 2.0.0-46.rc4.el8_2.1
    fixed: vendor fix RHSA-2020:2336
  • Red Hat CodeReady Linux Builder EUS (v. 8.1) freerdp-devel 2.0.0-46.rc4.el8_1.1, freerdp-debuginfo 2.0.0-46.rc4.el8_1.1, libwinpr-debuginfo 2.0.0-46.rc4.el8_1.1, freerdp-debugsource 2.0.0-46.rc4.el8_1.1, freerdp-libs-debuginfo 2.0.0-46.rc4.el8_1.1
    fixed: vendor fix RHSA-2020:2354
  • Red Hat Enterprise Linux AppStream (v. 8) freerdp 2.0.0-46.rc4.el8_2.1, libwinpr 2.0.0-46.rc4.el8_2.1, freerdp-libs 2.0.0-46.rc4.el8_2.1
    fixed: vendor fix RHSA-2020:2336
  • Red Hat Enterprise Linux AppStream E4S (v. 8.0) freerdp 2.0.0-46.rc4.el8_0.1, libwinpr 2.0.0-46.rc4.el8_0.1, freerdp-libs 2.0.0-46.rc4.el8_0.1
    fixed: vendor fix RHSA-2020:2335
  • Red Hat Enterprise Linux AppStream EUS (v. 8.1) freerdp 2.0.0-46.rc4.el8_1.1, libwinpr 2.0.0-46.rc4.el8_1.1, freerdp-libs 2.0.0-46.rc4.el8_1.1
    fixed: vendor fix RHSA-2020:2354
  • Red Hat Enterprise Linux Client (v. 7) freerdp 2.0.0-4.rc4.el7_8, libwinpr 2.0.0-4.rc4.el7_8, freerdp-libs 2.0.0-4.rc4.el7_8 Red Hat Enterprise Linux Client Optional (v. 7) freerdp-devel 2.0.0-4.rc4.el7_8, libwinpr-devel 2.0.0-4.rc4.el7_8, freerdp-debuginfo 2.0.0-4.rc4.el7_8 Red Hat Enterprise Linux Server (v. 7) freerdp 2.0.0-4.rc4.el7_8, libwinpr 2.0.0-4.rc4.el7_8, freerdp-libs 2.0.0-4.rc4.el7_8 Red Hat Enterprise Linux Server Optional (v. 7) freerdp-devel 2.0.0-4.rc4.el7_8, libwinpr-devel 2.0.0-4.rc4.el7_8, freerdp-debuginfo 2.0.0-4.rc4.el7_8 Red Hat Enterprise Linux Workstation (v. 7) freerdp 2.0.0-4.rc4.el7_8, libwinpr 2.0.0-4.rc4.el7_8, freerdp-libs 2.0.0-4.rc4.el7_8 Red Hat Enterprise Linux Workstation Optional (v. 7) freerdp-devel 2.0.0-4.rc4.el7_8, libwinpr-devel 2.0.0-4.rc4.el7_8, freerdp-debuginfo 2.0.0-4.rc4.el7_8
    fixed: vendor fix RHSA-2020:2334

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

1.99% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • pub.freerdp.com https://pub.freerdp.com/cve/CVE-2020-11523/pocAnalysis_2.pdf referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.6 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.0 AV:N/AC:M/Au:S/C:P/I:P/A:P

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

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.