Security readout for executives and security teams
Plain-English summary
FreeRDP versions before 3.20.1 contain a memory safety flaw. Under specific conditions, an attacker-triggered error path can access memory after it was freed. The published CVSS score is medium, but the stated confidentiality, integrity, and availability impacts are high for the vulnerable component.
Executive priority
Prioritize normal patch-cycle remediation, faster for systems where FreeRDP is broadly used or exposed to untrusted RDP interactions. There is a confirmed fix, but no provided evidence of active exploitation.
Technical view
CVE-2026-22857 is a CWE-416 heap use-after-free in FreeRDP's irp_thread_func. The IRP is freed by irp->Complete() and then accessed again on the error path. It affects FreeRDP before 3.20.1 and is fixed in 3.20.1. CVSS v4.0 score is 6.8 with network attack vector, high complexity, no privileges, and passive user interaction.
Likely exposure
Organizations are exposed where FreeRDP below 3.20.1 is installed directly or bundled in products, images, or packages. Exposure depends on whether vulnerable FreeRDP functionality is reachable in user workflows. Downstream Linux distribution packages may have their own patched versioning.
Exploitation context
The CVE is not listed as CISA KEV in the provided data. The CVSS vector indicates proof-of-concept exploit maturity, network reachability, high attack complexity, and required passive user interaction. No source in the bundle states active exploitation in the wild.
Researcher notes
The public record provides the vulnerable function, root cause, affected version range, fix version, CWE, and CVSS vector. It does not provide detailed exploit conditions, affected configurations, or downstream package status. Avoid assuming exploitability beyond the stated CVSS and advisory facts.
Mitigation direction
- Upgrade FreeRDP to version 3.20.1 or later.
- Update operating system or vendor packages that bundle FreeRDP.
- Review the FreeRDP advisory for any additional vendor guidance.
- If immediate upgrade is not possible, limit use of vulnerable FreeRDP builds.
Validation and detection
- Inventory endpoints, servers, containers, and images for FreeRDP installations.
- Confirm installed FreeRDP versions are 3.20.1 or later.
- Check downstream package changelogs for a backported fix.
- Verify vulnerability scanners recognize CVE-2026-22857 and fixed package states.
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-416: 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-2026-22857 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
- 6.8 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/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:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
6.8MediumVector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-4gxq-jhq6-4cr8CVE reference · x_refsource_CONFIRM
- https://github.com/FreeRDP/FreeRDP/releases/tag/3.20.1CVE 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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.