Missing offset validation leading to Out-of-Bounds Read in FreeRDP
Priority MEDIUM 43CWE-125Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · High
- Fix status
- Partial Red Hat: 2 fixed, 3 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
EPSS 0.01809 78th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial FreeRDP (FreeRDP): 2.11.0, 3.0.0-beta3Red Hat: 1 advisoryRed Hat: 2 fixed, 3 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| FreeRDP | FreeRDP | before 2.11.0; 3.0.0-beta1 to before 3.0.0-beta3 | 2.11.0, 3.0.0-beta3 | Patch available | CNA |
- FreeRDP VendorFreeRDP Affected before 2.11.0; 3.0.0-beta1 to before 3.0.0-beta3 Fixed in 2.11.0, 3.0.0-beta3 Patch available CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:* | before 2.11.0 | Vulnerable | FreeRDP |
| cpe:2.3:a:freerdp:freerdp:3.0.0:beta1:*:*:*:*:*:* | 3.0.0 beta1 | Vulnerable | FreeRDP |
| cpe:2.3:a:freerdp:freerdp:3.0.0:beta2:*:*:*:*:*:* | 3.0.0 beta2 | Vulnerable | FreeRDP |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Debian |
| cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* | 37 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:* | 38 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:* | 39 | Vulnerable | Fedoraproject |
- cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:* Versions before 2.11.0 Vulnerable ·FreeRDP
- cpe:2.3:a:freerdp:freerdp:3.0.0:beta1:*:*:*:*:*:* Versions 3.0.0 beta1 Vulnerable ·FreeRDP
- cpe:2.3:a:freerdp:freerdp:3.0.0:beta2:*:*:*:*:*:* Versions 3.0.0 beta2 Vulnerable ·FreeRDP
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
- cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* Versions 37 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:* Versions 38 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:* Versions 39 Vulnerable ·Fedoraproject
Remediation
- Fix · CNA FreeRDP (FreeRDP) Fixed in 2.11.0, 3.0.0-beta3
Red Hat 1 advisory
- RHSA-2024:2208 Released 2024-04-30 · Red Hat rating Moderatefreerdp security update
- Red Hat Enterprise Linux AppStream (v. 9) freerdp-2:2.11.2-1.el9, freerdp-libs-2:2.11.2-1.el9, libwinpr-2:2.11.2-1.el9
- Red Hat Enterprise Linux CRB (v. 9) freerdp-devel-2:2.11.2-1.el9, libwinpr-devel-2:2.11.2-1.el9
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 8 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2024:2208 |
| Red Hat Enterprise Linux CRB (v. 9) | Fixed | RHSA-2024:2208 |
Timeline
- 2026-10-02 Threatist record created from CVE-2023-39356
References
Advisory 2
Other 6
- https://github.com/FreeRDP/FreeRDP/blob/63a2f65618748c12f79ff7450d46c6e194f2db76/include/freerdp/primary.h#L186-L196
- https://github.com/FreeRDP/FreeRDP/blob/63a2f65618748c12f79ff7450d46c6e194f2db76/libfreerdp/core/orders.c#L1503-L1504
- https://github.com/FreeRDP/FreeRDP/blob/63a2f65618748c12f79ff7450d46c6e194f2db76/libfreerdp/gdi/gdi.c#L723C1-L758
- https://lists.fedoraproject.org/archives/list/[email protected]/message/OH2ATH2BKDNKCJAU4WPPXK4SHLE3UJUV/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/A6LLDAPEXRDJOM3PREDDD267SSNT77DP/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/IHMTGKCZXJPQOR5ZD2I4GPDNP2DKRXMF/
More Freerdp vulnerabilities
- TI-2026-85092 Use-after-free in FreeRDP rdpgfx channel close handling CVSS 4.0CRITICAL 9.3
- TI-2026-85091 Out-of-bounds write in FreeRDP proxy via bitmap cache v2 capability CVSS 4.0CRITICAL 9.3
- TI-2026-24435 FreeRDP has a `size_t` underflow in ADPCM decoder leads to heap-buffer-overflow write CVSS 3.1CRITICAL 9.8
- TI-2023-21373 Out-Of-Bounds Write in FreeRDP CVSS 3.1CRITICAL 9.8
- TI-2022-08692 Server side NTLM does not properly check parameters in FreeRDP CVSS 3.1CRITICAL 9.1
- TI-2023-21374 Out-Of-Bounds Read in FreeRDP CVSS 3.1CRITICAL 9.1
Sources
- CVE-2023-39356 · CVE Program
- CVE-2023-39356 · NVD
- FIRST EPSS
- CVE-2023-39356 · Red Hat security data · CC BY 4.0
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