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CVE-2023-39352· NVD / CVE Program· CNA GitHub_M

Invalid offset validation leading to Out Of Bound Write in FreeRDP

Noroxi assessment

Priority: Monitor (action score 39/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.5% (FIRST EPSS); higher than 74.6% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: freerdp (AlmaLinux:9) 2:2.11.2-1.el9; freerdp-devel (AlmaLinux:9) 2:2.11.2-1.el9; freerdp-libs (AlmaLinux:9) 2:2.11.2-1.el9.
  • Severity is disputed: the assigning authority (CNA) scores it 5.3, NVD 9.8.

Low priority for now. Upgrade to freerdp (AlmaLinux:9) 2:2.11.2-1.el9; freerdp-devel (AlmaLinux:9) 2:2.11.2-1.el9; freerdp-libs (AlmaLinux:9) 2:2.11.2-1.el9 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license. Affected versions are subject to an invalid offset validation leading to Out Of Bound Write. This can be triggered when the values `rect->left` and `rect->top` are exactly equal to `surface->width` and `surface->height`. eg. `rect->left` == `surface->width` && `rect->top` == `surface->height`. In practice this should cause 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.

CriticalCVSS 9.8 · v3.1—No exploit Fix available
Published
Aug 31, 2023
Updated
Jun 17, 2026
EPSS
1.5% · 74th percentile

Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.5%

CNA vs NVD score

NVD
9.8
CNA · GitHub_M
5.3
4.5 point gap

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2023-39352

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
freerdpfreerdp
debiandebian linux
fedoraprojectfedora

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux10.0
  • fedoraproject fedora37
  • fedoraproject fedora38
  • fedoraproject fedora39
  • freerdp freerdpbefore 2.11.0
  • freerdp freerdp3.0.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • FreeRDP FreeRDP

    • < 2.11.0, >= 3.0.0-beta1, < 3.0.0-beta3affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:9freerdpbefore 2:2.11.2-1.el92:2.11.2-1.el9
AlmaLinux:9freerdp-develbefore 2:2.11.2-1.el92:2.11.2-1.el9
AlmaLinux:9freerdp-libsbefore 2:2.11.2-1.el92:2.11.2-1.el9
AlmaLinux:9libwinprbefore 2:2.11.2-1.el92:2.11.2-1.el9
AlmaLinux:9libwinpr-develbefore 2:2.11.2-1.el92:2.11.2-1.el9
Debian:11freerdp2before 2.3.0+dfsg1-2+deb11u22.3.0+dfsg1-2+deb11u2
Debian:12freerdp2before 2.11.7+dfsg1-6~deb12u12.11.7+dfsg1-6~deb12u1
openSUSE:Leap 15.4freerdpbefore 2.4.0-150400.3.23.12.4.0-150400.3.23.1
openSUSE:Tumbleweedfreerdp2before 2.11.2-3.12.11.2-3.1
Red Hat:enterprise_linux:9::appstreamfreerdpbefore 2:2.11.2-1.el92:2.11.2-1.el9
Red Hat:enterprise_linux:9::appstreamfreerdp-debuginfobefore 2:2.11.2-1.el92:2.11.2-1.el9
Red Hat:enterprise_linux:9::appstreamfreerdp-debugsourcebefore 2:2.11.2-1.el92:2.11.2-1.el9
Red Hat:enterprise_linux:9::appstreamfreerdp-libsbefore 2:2.11.2-1.el92:2.11.2-1.el9
Red Hat:enterprise_linux:9::appstreamfreerdp-libs-debuginfobefore 2:2.11.2-1.el92:2.11.2-1.el9
Red Hat:enterprise_linux:9::appstreamlibwinprbefore 2:2.11.2-1.el92:2.11.2-1.el9
Red Hat:enterprise_linux:9::appstreamlibwinpr-debuginfobefore 2:2.11.2-1.el92:2.11.2-1.el9
Red Hat:enterprise_linux:9::crbfreerdp-develbefore 2:2.11.2-1.el92:2.11.2-1.el9
Red Hat:enterprise_linux:9::crblibwinpr-develbefore 2:2.11.2-1.el92:2.11.2-1.el9
SUSE:Linux Enterprise Module for Package Hub 15 SP4freerdpbefore 2.4.0-150400.3.23.12.4.0-150400.3.23.1
SUSE:Linux Enterprise Software Development Kit 12 SP5freerdpbefore 2.1.2-12.38.12.1.2-12.38.1

Same product

freerdp: all records

Other highest-scoring records for the same primary product.

  • CVE-2018-8787FreeRDP prior to version 2.0.0-rc4 contains an Integer Overflow that leads to a Heap-Based Buffer Overflow in function gdi_Bitmap_Decompress
    42Plan
  • CVE-2018-8788FreeRDP prior to version 2.0.0-rc4 contains an Out-Of-Bounds Write of up to 4 bytes in function nsc_rle_decode() that results in a memory co
    41Plan
  • CVE-2018-8786FreeRDP prior to version 2.0.0-rc4 contains an Integer Truncation that leads to a Heap-Based Buffer Overflow in function update_read_bitmap_
    41Plan

Published before and after this one in the same product

  • ← EarlierCVE-2023-39354Aug 31, 2023 · FreeRDP Out-Of-Bounds Read in nsc_rle_decompress_data
    30Monitor
  • ← EarlierCVE-2023-39355Aug 31, 2023 · FreeRDP Use-After-Free in RDPGFX_CMDID_RESETGRAPHICS
    39Monitor
  • Later →CVE-2023-39353Aug 31, 2023 · Missing offset validation leading to Out Of Bound Read in FreeRDP
    36Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:freerdp2:2.11.2-1.el9 · AlmaLinux:9Package registry (OSV)
almalinux:freerdp-devel2:2.11.2-1.el9 · AlmaLinux:9Package registry (OSV)
almalinux:freerdp-libs2:2.11.2-1.el9 · AlmaLinux:9Package registry (OSV)
almalinux:libwinpr2:2.11.2-1.el9 · AlmaLinux:9Package registry (OSV)
almalinux:libwinpr-devel2:2.11.2-1.el9 · AlmaLinux:9Package registry (OSV)
debian:freerdp22.11.7+dfsg1-6~deb12u1 · Debian:12Package registry (OSV)
opensuse:freerdp2.4.0-150400.3.23.1 · openSUSE:Leap 15.4Package registry (OSV)
opensuse:freerdp22.11.2-3.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:freerdp2:2.11.2-1.el9 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:freerdp-debuginfo2:2.11.2-1.el9 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:freerdp-debugsource2:2.11.2-1.el9 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:freerdp-devel2:2.11.2-1.el9 · Red Hat:enterprise_linux:9::crbPackage registry (OSV)
red hat:freerdp-libs2:2.11.2-1.el9 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:freerdp-libs-debuginfo2:2.11.2-1.el9 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:libwinpr2:2.11.2-1.el9 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:libwinpr-debuginfo2:2.11.2-1.el9 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:libwinpr-devel2:2.11.2-1.el9 · Red Hat:enterprise_linux:9::crbPackage registry (OSV)
suse:freerdp2.1.2-12.38.1 · SUSE:Linux Enterprise Software Development Kit 12 SP5Package registry (OSV)
suse:freerdp2.4.0-150400.3.23.1 · SUSE:Linux Enterprise Module for Package Hub 15 SP4Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records