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CVE-2026-84784VulnerabilityPublished Updated

Microsoft · QUIC: Unbounded RETIRE_CONNECTION_ID Backlog

Affects MicrosoftSource GCVE Database

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Not known to be exploited.

Data as of 14 Nov 2026, 09:48 UTC

Severity
Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 3 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
Microsoft Security Response Center MicrosoftAffected
  • =3.0
  • =4.0
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.

References

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