CVE-2023-24898Network attack vector

Unauthenticated server hang via unchecked QUIC allocation

Published May 9, 2023 · Updated Jul 10, 2025

Denial of service in SMB over QUIC in Microsoft Windows Server 2022 before 10.0.20348.1724 allows remote attackers to hang the server. SrvNetQuicServerReceiveEvent in srvnet.sys validates a four-byte message size only when all four bytes arrive together, then allocates up to 16 MB without repeating the limit check when the size is split across packets. Repeated unauthenticated connections can exhaust kernel memory and make an enabled SMB-over-QUIC server with no more than 32 GB of RAM unstable and unresponsive.

CVSS severity7.5
High
EPSS probability2.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in SMB over QUIC in Microsoft Windows Server 2022 before 10.0.20348.1724 allows remote attackers to hang the server. SrvNetQuicServerReceiveEvent in srvnet.sys validates a four-byte message size only when all four bytes arrive together, then allocates up to 16 MB without repeating the limit check when the size is split across packets. Repeated unauthenticated connections can exhaust kernel memory and make an enabled SMB-over-QUIC server with no more than 32 GB of RAM unstable and unresponsive.

The record

CVE
CVE-2023-24898
Published
May 9, 2023
Updated
Jul 10, 2025
Vendor
Microsoft
Product
Windows Server 2022
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 9, 2023CVE publishedPublication date reported by the CVE source.
  2. Jul 10, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.20348.0 <10.0.20348.1724

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.1724

Published CVSS scores

7.5Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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