cbcvebase.
CVE-2023-21769
published 2023-04-11

CVE-2023-21769: Microsoft Message Queuing (MSMQ) Denial of Service Vulnerability

PriorityP351high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
91.52%
99.8th percentile
Microsoft Message Queuing (MSMQ) Denial of Service Vulnerability

Affected

40 ranges· showing 25
VendorProductVersion rangeFixed in
microsoftwindows_10_1607< 10.0.14393.585010.0.14393.5850
microsoftwindows_10_1809< 10.0.17763.425210.0.17763.4252
microsoftwindows_10_20h2< 10.0.19042.284610.0.19042.2846
microsoftwindows_10_21h2< 10.0.19044.284610.0.19044.2846
microsoftwindows_10_22h2< 10.0.19045.284610.0.19045.2846
microsoftwindows_10_version_1507>= 10.0.10240.0 < 10.0.10240.1986910.0.10240.19869
microsoftwindows_10_version_1607>= 10.0.14393.0 < 10.0.14393.585010.0.14393.5850
microsoftwindows_10_version_1809>= 10.0.0 < 10.0.17763.425210.0.17763.4252
microsoftwindows_10_version_1809>= 10.0.17763.0 < 10.0.17763.425210.0.17763.4252
microsoftwindows_10_version_20h2>= 10.0.0 < 10.0.19042.284610.0.19042.2846
microsoftwindows_10_version_21h2>= 10.0.19043.0 < 10.0.19044.284610.0.19044.2846
microsoftwindows_10_version_22h2>= 10.0.19045.0 < 10.0.19045.284610.0.19045.2846
microsoftwindows_11_21h2< 10.0.22000.181710.0.22000.1817
microsoftwindows_11_22h2< 10.0.22621.155510.0.22621.1555
microsoftwindows_11_version_21h2>= 10.0.0 < 10.0.22000.181710.0.22000.1817
microsoftwindows_11_version_22h2>= 10.0.22621.0 < 10.0.22621.155510.0.22621.1555
microsoftwindows_server_2008
microsoftwindows_server_2008_r2_service_pack_1>= 6.1.7601.0 < 6.1.7601.264666.1.7601.26466
microsoftwindows_server_2008_service_pack_2>= 6.0.6003.0 < 6.0.6003.220156.0.6003.22015
microsoftwindows_server_2012
microsoftwindows_server_2012>= 6.2.9200.0 < 6.2.9200.242166.2.9200.24216
microsoftwindows_server_2012_r2>= 6.3.9600.0 < 6.3.9600.209196.3.9600.20919
microsoftwindows_server_2016>= 10.0.14393.0 < 10.0.14393.585010.0.14393.5850
microsoftwindows_server_2019>= 10.0.17763.0 < 10.0.17763.425210.0.17763.4252
microsoftwindows_server_2022>= 10.0.20348.0 < 10.0.20348.166810.0.20348.1668

Detection & IOCsextracted from sources · hover to see the quote

port1801/tcp
processmqsvc.exe
processMQSVC.EXE
  • Detect CVE-2023-21769 (unauthenticated Remote Application Level DoS / service crash) by monitoring for unexpected crashes or restarts of the MSMQ service process (mqsvc.exe/MQSVC.EXE).
  • Monitor inbound connections to TCP port 1801 from untrusted/external sources as the primary attack vector for all three MSMQ vulnerabilities including CVE-2023-21769.
  • Check for the MSMQ service ('Message Queuing') listening on TCP 1801 to identify exposed attack surface; over 360,000 Internet-facing IPs were found running this service.
  • The vulnerability is triggered via the MSMQ message header parser in MQQM.DLL; look for malformed or oversized EodHeader, StreamIdSize, or OrderQueueSize fields in packets arriving on port 1801.

CVSS provenance

nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vendor_msrc7.5HIGH
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