What is CVE-2026-33114?
A client-side parsing vulnerability in the Microsoft Remote Desktop Client allows remote code execution when a user connects to a rogue or attacker-controlled RDP server. The flaw is triggered during the initial connection negotiation phase, enabling an attacker hosting a malicious RDP server to execute arbitrary code on the connecting client system. This attack scenario is particularly dangerous in environments where users connect to external or untrusted RDP endpoints, or where an attacker can redirect RDP connections via DNS poisoning or man-in-the-middle techniques. This vulnerability was patched as part of the Microsoft April 2026 Patch Tuesday release.
The record classifies CVE-2026-33114 under weakness class CWE-20. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first, and has high impact on confidentiality, integrity, availability. 3 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 197 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 8.8 — HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - EPSS (FIRST)
- 0.3% probability of exploitation in the next 30 days, higher than 28.2% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 5.5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-04-14, last modified 2026-09-25
Is CVE-2026-33114 being exploited?
It currently carries a trending score of 12 in the Threadlinqs vulnerability feed.
Affected products and versions
- Microsoft: Remote Desktop Client for Windows, Remote Desktop Client for macOS, Remote Desktop
How to fix CVE-2026-33114
The record marks a vendor fix as available for CVE-2026-33114. Patch reference: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33114. Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33114. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2026-33114
2 tracked threats in the Threadlinqs corpus reference CVE-2026-33114, either in the campaign’s CVE list or as an indicator on the campaign record.
- Microsoft April 2026 Patch Tuesday — 163 CVEs / 88 Advisories (CVE-2026-32201 SharePoint Zero-Day Exploited In-The-Wild, CVE-2026-33825 Defender EoP Public PoC, CVE-2026-33824 IKE RCE CVSS 9.8, CVE-2026-33827 TCP/IP Wormable RCE) — CRITICAL · 2026-04-19
- Microsoft April 2026 Patch Tuesday — 167 Flaws, 2 Zero-Days (SharePoint Spoofing CVE-2026-32201 + Defender EoP CVE-2026-33825) — CRITICAL · 2026-04-14
Sources
Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.