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TI-2022-18693 Aliases CVE-2022-39317

Out of bounds read in zgfx decoder in FreeRDP

Priority LOW 22CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
Low · Low · Low
Fix status
Partial Red Hat: 4 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

FreeRDP is a free remote desktop protocol library and clients. Affected versions of FreeRDP are missing a range check for input offset index in ZGFX decoder. A malicious server can trick a FreeRDP based client to read out of bound data and try to decode it. This issue has been addressed in version 2.9.0. There are no known workarounds for this issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00688 52nd percentileScored 2026-11-07
Fix Partial FreeRDP (FreeRDP): 2.9.0Red Hat: 2 advisoriesRed Hat: 4 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
FreeRDPFreeRDPbefore 2.9.02.9.0Patch availableCNA
  • FreeRDP VendorFreeRDP Affected before 2.9.0 Fixed in 2.9.0 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*before 2.9.0VulnerableFreeRDP
cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*36VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*37VulnerableFedoraproject
  • cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:* Versions before 2.9.0 Vulnerable ·FreeRDP
  • cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:* Versions 36 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* Versions 37 Vulnerable ·Fedoraproject

Remediation

  • Fix · CNA FreeRDP (FreeRDP) Fixed in 2.9.0

Red Hat 2 advisories

  • RHSA-2023:2851 Released 2023-05-16 · Red Hat rating Moderate
    freerdp security update
    • Red Hat Enterprise Linux AppStream (v. 8) freerdp-2:2.2.0-10.el8, freerdp-libs-2:2.2.0-10.el8, libwinpr-2:2.2.0-10.el8 +1
    • Red Hat Enterprise Linux CRB (v. 8) freerdp-devel-2:2.2.0-10.el8
  • RHSA-2023:2326 Released 2023-05-09 · Red Hat rating Moderate
    freerdp security update
    • Red Hat Enterprise Linux AppStream (v. 9) freerdp-2:2.4.1-5.el9, freerdp-libs-2:2.4.1-5.el9, libwinpr-2:2.4.1-5.el9
    • Red Hat Enterprise Linux CRB (v. 9) freerdp-devel-2:2.4.1-5.el9, libwinpr-devel-2:2.4.1-5.el9

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    FreeRDP — FEDORA-2022-076b1c9978

    7 records Highest priority Priority LOW 7 LOW

    Other records, highest priority first

    • TI-2022-18722 Missing path sanitation with `drive` channel in FreeRDPPriority LOW 28
    • TI-2022-18694 Division by zero in urbdrc channel in FreeRDPPriority LOW 28
    • TI-2022-18692 Out of bound read in FreeRDPPriority LOW 28
    Show all 7 records → Advisory →
  • Advisory ·

    FreeRDP — GLSA-202401-16

    7 records Highest priority Priority LOW 7 LOW

    Other records, highest priority first

    • TI-2022-18722 Missing path sanitation with `drive` channel in FreeRDPPriority LOW 28
    • TI-2022-18694 Division by zero in urbdrc channel in FreeRDPPriority LOW 28
    • TI-2022-18692 Out of bound read in FreeRDPPriority LOW 28
    Show all 7 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2023:2851
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2023:2326
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2023:2851
Red Hat Enterprise Linux CRB (v. 9)Fixed RHSA-2023:2326

Timeline

  1. 2026-10-02 Threatist record created from CVE-2022-39317

References

Advisory 4

  • 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
See all 336 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences