How severe is CVE-2023-21554?

CVE-2023-21554 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2023-21554?

Affected package information for CVE-2023-21554 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2023-21554?

No fixed version has been published for CVE-2023-21554 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2023-21554 actively exploited in the wild?

Yes. There are 7 known exploit references for CVE-2023-21554, including 4 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2023-21554?

CVE-2023-21554 has an EPSS (Exploit Prediction Scoring System) score of 91.9%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

What type of vulnerability is CVE-2023-21554?

CVE-2023-21554 is classified as Improper Input Validation (CWE-20). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2023-21554?

CVE-2023-21554 affects microsoft windows 10 20h2; microsoft windows 10 21h2; microsoft windows 10 22h2; microsoft windows 10 1607, and 8 more product(s). Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2023-21554 published, and has it been updated?

CVE-2023-21554 was published on April 11, 2023 and was last updated on November 21, 2024. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CVE-2023-21554

CRITICAL

Microsoft Message Queuing (MSMQ) Remote Code Execution Vulnerability

Published

Apr 11, 2023

Updated

Nov 21, 2024

Affected

0 pkgs

Patched

None yet

Exploits

7 known

EPSS Exploitation Probability

via FIRST.org ↗

91.9%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

Microsoft Message Queuing (MSMQ) Remote Code Execution Vulnerability

Affected Products

12 products · 14 configurations

windows 10 20h2microsoft

< 10.0.19042.2846

range

windows 10 21h2microsoft

< 10.0.19044.2846

range

windows 10 22h2microsoft

< 10.0.19045.2846

range

windows 10 1607microsoft

< 10.0.14393.5850

range

windows 10 1809microsoft

< 10.0.17763.4252

range

windows 11 21h2microsoft

< 10.0.22000.1817

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Microsoft Message Queuing (MSMQ) Remote Code Execution Vulnerability

github.comGithubApr 2023

Microsoft Message Queuing (MSMQ) Remote Code Execution Vulnerability

github.comGithubMay 2023

Microsoft Message Queuing (MSMQ) Remote Code Execution Vulnerability

github.comMetasploitSep 2023

Microsoft Message Queuing (MSMQ) Remote Code Execution Vulnerability

github.comGithubAug 2023

Frequently Asked Questions

Microsoft Message Queuing (MSMQ) Remote Code Execution Vulnerability

O3 Security · Impact-Aware SCA

Is CVE-2023-21554 in your stack?

O3 detects CVE-2023-21554 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my stack How O3 SCA works