Skip to main content
No exploitation reportedFix available

CVE-2023-39356

No exploitation reported by the sources we read.

  • Published2023-08-31
  • Fixed in2.11.0
  • WeaknessCWE-125

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license. In affected versions a missing offset validation may lead to an Out Of Bound Read in the function `gdi_multi_opaque_rect`. In particular there is no code to validate if the value `multi_opaque_rect->numRectangles` is less than 45. Looping through `multi_opaque_rect->`numRectangles without proper boundary checks can lead to Out-of-Bounds Read errors which will likely lead to a crash. This issue has been addressed in versions 2.11.0 and 3.0.0-beta3. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Timeline

dates in UTC
  1. 2023-08-3121:15CVE publishedNVD

Versions per branch

NVD
Freerdp
BranchAffectedFixed in
2.11< 2.11.02.11.0
3.0= 3.0.0no fix published
Fedoraproject fedora
BranchAffectedFixed in
37.x= 37no fix published
38.x= 38no fix published
39.x= 39no fix published
Debian debian linux
BranchAffectedFixed in
10.0= 10.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • freerdpTuxCare:CentOS:7all versions · fixed in 2.1.1-5.el7_9.tuxcare.els1and 4 other packages
  • freerdpSUSE:Linux Enterprise Workstation Extension 15 SP5all versions · fixed in 2.4.0-150400.3.23.1
  • freerdpSUSE:Linux Enterprise Workstation Extension 15 SP4all versions · fixed in 2.4.0-150400.3.23.1
  • freerdpSUSE:Linux Enterprise Workstation Extension 12 SP5all versions · fixed in 2.1.2-12.38.1
  • freerdpSUSE:Linux Enterprise Software Development Kit 12 SP5all versions · fixed in 2.1.2-12.38.1
  • freerdpSUSE:Linux Enterprise Module for Package Hub 15 SP5all versions · fixed in 2.4.0-150400.3.23.1
  • freerdpSUSE:Linux Enterprise Module for Package Hub 15 SP4all versions · fixed in 2.4.0-150400.3.23.1
  • freerdpRed Hat:enterprise_linux:9::appstreamall versions · fixed in 2:2.11.2-1.el9and 6 other packages

16 more package ranges on OSV.dev

Vendor advisories

  • CVE-2023-39356 Red Hat Product Security90 products fixed · 18 known affected

    freerdp: missing offset validation leading to Out-of-Bounds Read in gdi_multi_opaque_rect

    freerdp as a component of Red Hat Enterprise Linux 6 · freerdp-devel as a component of Red Hat Enterprise Linux 6 · freerdp-libs as a component of Red Hat Enterprise Linux 6 · +15 more

  • RHSA-2024:2208 Red Hat Product Security65 products fixed

    Red Hat Security Advisory: freerdp security update

Full record on NVD

Fix

  1. Update Freerdp to 2.11.0
  2. Vendor fix Red Hat Product Security RHSA-2024:2208 · 65 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  3. No fix planned, says the vendor Red Hat Product Security CVE-2023-39356 · 12 productsOut of support scope
  4. No fix planned, says the vendor Red Hat Product Security CVE-2023-39356 · 6 productsWill not fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CNACVSS 3.15.3known since 2026-10-23
  • NVDCVSS 3.19.1read 2026-10-23
  • CNAweakness (CWE)CWE-125known since 2026-10-23
  • NVDweakness (CWE)CWE-125read 2026-10-23
  • FIRST EPSSEPSS score1.8 %2026-11-08
  • OSVaffected packages—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Published
2023-08-31
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2023-39356?

FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license. In affected versions a missing offset validation may lead to an Out Of Bound Read in the function `gdi_multi_opaque_rect`. In particular there is no code to validate if the value `multi_opaque_rect->numRectangles` is less than 45. Looping through `multi_opaque_rect->`numRectangles without proper boundary checks can lead to Out-of-Bounds Read errors which will likely lead to a crash. This issue has been addressed in versions 2.11.0 and 3.0.0-beta3. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Is CVE-2023-39356 actively exploited?

Active exploitation of CVE-2023-39356 has not been confirmed. Its EPSS score was 1.8% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-39356?

CVE-2023-39356 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

Running freerdp? Hear about its next vulnerability

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this productCISA KEV additions, November 2026Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database

Sources for this record