Microsoft · QUIC: Unbounded RETIRE_CONNECTION_ID Backlog
Affects MicrosoftSource GCVE Database
Not known to be exploited.
Data as of 14 Nov 2026, 09:48 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Exploitation evidence
Disclosed: evidence found.
CVE published 3 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Microsoft Security Response Center Microsoft | Affected
| Fixed in– |
Description
CVE-2026-84784 is a vulnerability in Microsoft products related to the QUIC protocol, specifically involving an unbounded RETIRE_CONNECTION_ID backlog. The issue is identified in versions 3.0 and 4.0 of the affected software. No CVSS score or detailed impact information is provided, and no known exploits are reported in the wild. No patch or remediation details are available from the vendor at this time.