Security readout for executives and security teams
Plain-English summary
CVE-2026-23732 affects FreeRDP clients before 3.21.0. A malicious RDP server can send malformed FastGlyph data that crashes the client. The documented impact is denial of service, not data theft or remote code execution. Organizations using FreeRDP for remote desktop access should prioritize updating affected clients.
Executive priority
Medium priority. This is a client-crash vulnerability with a published fixed version. Prioritize remediation where FreeRDP is used in operational workflows, remote administration, or automated connections to third-party or less-trusted RDP endpoints.
Technical view
FreeRDP FastGlyph parsing trusted cbData and remaining buffer length without validating the minimum size implied by cx/cy. This can cause a heap/global buffer overflow in Glyph_Alloc-related processing when a client handles malicious server data. The CVE lists CWE-122 and CVSS 4.0 score 5.5. Version 3.21.0 includes the patch.
Likely exposure
Exposure is most likely on systems running FreeRDP client versions earlier than 3.21.0, especially where users or automation connect to untrusted, internet-hosted, or potentially compromised RDP servers.
Exploitation context
The source bundle states a malicious server can trigger a client-side crash. CISA KEV status is false in the provided data, and no cited source states active exploitation. Treat this as a practical DoS risk for exposed FreeRDP clients.
Researcher notes
Key evidence is the FreeRDP advisory and referenced source locations in glyph, color, graphics, and orders handling. The provided description limits impact to crash/DoS. Do not assume code execution without additional evidence. Patch availability is stated for 3.21.0.
Mitigation direction
- Upgrade FreeRDP to version 3.21.0 or later.
- Inventory desktops, jump hosts, and automation using FreeRDP libraries or clients.
- Limit FreeRDP connections to trusted RDP servers where possible.
- Check downstream OS or package vendor advisories for backported fixes.
Validation and detection
- Confirm installed FreeRDP versions are 3.21.0 or later.
- Review package manager or software inventory data for FreeRDP dependencies.
- Identify workflows connecting FreeRDP clients to untrusted RDP servers.
- Verify vendor release notes or advisories are reflected in deployed builds.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-122: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-23732 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.5 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
5.5MediumVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-7qxp-j2fj-c3ppCVE reference · x_refsource_CONFIRM
- https://github.com/FreeRDP/FreeRDP/blob/f96ee2a6dd02739325c2a4e36a14978b561f00ea/libfreerdp/cache/glyph.c#L463-L480CVE reference · x_refsource_MISC
- https://github.com/FreeRDP/FreeRDP/blob/f96ee2a6dd02739325c2a4e36a14978b561f00ea/libfreerdp/codec/color.c#L261-L277CVE reference · x_refsource_MISC
- https://github.com/FreeRDP/FreeRDP/blob/f96ee2a6dd02739325c2a4e36a14978b561f00ea/libfreerdp/core/graphics.c#L138CVE reference · x_refsource_MISC
- https://github.com/FreeRDP/FreeRDP/blob/f96ee2a6dd02739325c2a4e36a14978b561f00ea/libfreerdp/core/orders.c#L2186C17-L2199CVE reference · x_refsource_MISC
- https://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Heap-based Buffer Overflow
Heap-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.