Security readout for executives and security teams
Plain-English summary
CVE-2022-39318 can crash vulnerable FreeRDP clients when they connect to a malicious RDP server with USB redirection enabled. The business impact is service disruption for affected users, not data theft. The vendor fixed it in FreeRDP 2.9.0 and advises disabling `/usb` if upgrading is not possible.
Executive priority
Treat this as a moderate availability risk. Patch during the normal vulnerability cycle, faster where FreeRDP clients connect outside trusted infrastructure or depend on USB redirection for operational workflows.
Technical view
Affected FreeRDP versions before 2.9.0 lack input validation in the `urbdrc` channel, allowing a malicious server to trigger division by zero in a client. The mapped weaknesses are CWE-20 and CWE-369. CVSS 3.1 is 4.8 with network attack vector, required user interaction, high complexity, and availability-only impact.
Likely exposure
Exposure is mainly FreeRDP-based clients below 2.9.0 that use USB redirection and connect to untrusted or compromised RDP servers. Systems not using `/usb` redirection have materially lower exposure based on the vendor workaround.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation evidence. Exploitation requires a malicious server and a user or workflow causing a vulnerable client to connect. The known outcome is client crash, not code execution or data compromise.
Researcher notes
The strongest evidence is the FreeRDP advisory and fixing commit. Scope is limited to FreeRDP before 2.9.0 and the `urbdrc` USB redirection channel. Evidence provided does not support claims of active exploitation, broader product impact, or impacts beyond client denial of service.
Mitigation direction
- Upgrade FreeRDP to version 2.9.0 or later.
- If upgrading is delayed, do not use the `/usb` redirection switch.
- Apply distribution security updates for Fedora, Debian LTS, Gentoo, or relevant vendor packages.
- Review vendor advisories for package-specific fixed versions.
Validation and detection
- Inventory FreeRDP and freerdp2 package versions across managed endpoints.
- Check client launch scripts and profiles for `/usb` redirection usage.
- Confirm security changelogs or package metadata reference CVE-2022-39318 remediation.
- Prioritize clients connecting to third-party, internet-hosted, or less-trusted RDP servers.
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-20: 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 lookupCWE-369: 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-2022-39318 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
- 4.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H
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:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H1.23.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.8MediumVector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-387j-8j96-7q35CVE reference
- https://github.com/FreeRDP/FreeRDP/commit/80adde17ddc4b596ed1dae0922a0c54ab3d4b8eaCVE reference
- FEDORA-2022-fd6e43dec8CVE reference · vendor-advisory
- FEDORA-2022-076b1c9978CVE reference · vendor-advisory
- [debian-lts-announce] 20231117 [SECURITY] [DLA 3654-1] freerdp2 security updateCVE reference · mailing-list
- GLSA-202401-16CVE reference · vendor-advisory
- https://lists.debian.org/debian-lts-announce/2025/02/msg00016.htmlCVE reference
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.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Divide By Zero
Divide By Zero represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.