CVE-2023-21554

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2023-04-11. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Weaponized
9.8EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 95%
  • Public exploit code is available (Metasploit, epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 95%CVSS: 9.8Exploit: Metasploit · epss top5pct · epss high · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Microsoft Message Queuing (MSMQ) Remote Code Execution Vulnerability

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
97(Track)
EG Risk 97/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation95% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
95%
EPSS %ILE
100%
KEV
Not listed

Published

April 11, 2023

Last Modified

November 21, 2024

Advisory Details (1)

Auto-updated Sep 4, 2026
Patch available. Sources: microsoft.
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21554

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 4× in last 7d / 9× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-06 13:45 UTCEPSS rescore
  2. 2026-09-05 15:25 UTCEPSS rescore
  3. 2026-09-04 13:58 UTCEPSS rescore
  4. 2026-09-04 13:57 UTCEPSS rescore
  5. 2026-08-30 19:15 UTCEPSS rescore
  6. 2026-08-28 21:38 UTCEPSS rescore
  7. 2026-08-24 14:14 UTCEPSS rescore
  8. 2026-08-19 17:01 UTCEPSS rescore
  9. 2026-08-16 02:12 UTCEPSS rescore
  10. 2026-08-08 16:34 UTCEPSS rescore
  11. 2026-08-07 16:24 UTCEPSS rescore
  12. 2026-08-06 13:44 UTCEPSS rescore
  13. 2026-08-03 10:34 UTCEPSS rescore
  14. 2026-08-02 02:24 UTCEPSS rescore
  15. 2026-08-02 02:24 UTCEPSS rescore
  16. 2026-07-30 16:26 UTCEPSS rescore
  17. 2026-07-30 01:28 UTCEPSS rescore
  18. 2026-07-30 01:28 UTCEPSS rescore
  19. 2026-07-26 14:52 UTCEPSS rescore
  20. 2026-07-26 14:52 UTCEPSS rescore
  21. 2026-07-23 02:18 UTCEG score recompute
  22. 2026-07-22 23:06 UTCEG score recompute
  23. 2026-07-22 14:06 UTCEPSS rescore
  24. 2026-07-19 14:29 UTCEPSS rescore
  25. 2026-07-19 14:29 UTCEPSS rescore
Show 27 more
  1. 2026-07-19 02:27 UTCEPSS rescore
  2. 2026-07-19 02:27 UTCEPSS rescore
  3. 2026-07-01 15:04 UTCEPSS rescore
  4. 2026-06-24 14:03 UTCEPSS rescore
  5. 2026-06-24 14:03 UTCEPSS rescore
  6. 2026-06-23 21:31 UTCEPSS rescore
  7. 2026-06-23 21:31 UTCEPSS rescore
  8. 2026-06-22 14:24 UTCEPSS rescore
  9. 2026-06-22 14:24 UTCEPSS rescore
  10. 2026-06-21 01:58 UTCEPSS rescore
  11. 2026-06-21 01:58 UTCEPSS rescore
  12. 2026-06-15 17:47 UTCEPSS rescore
  13. 2026-06-12 23:10 UTCEPSS rescore
  14. 2026-06-11 13:59 UTCEPSS rescore
  15. 2026-06-11 13:58 UTCEPSS rescore
  16. 2026-06-10 22:17 UTCEPSS rescore
  17. 2026-06-06 13:46 UTCEPSS rescore
  18. 2026-06-06 13:46 UTCEPSS rescore
  19. 2026-06-04 13:11 UTCEPSS rescore
  20. 2026-06-04 13:11 UTCEPSS rescore
  21. 2026-05-29 13:43 UTCEPSS rescore
  22. 2026-05-29 13:43 UTCEPSS rescore
  23. 2026-05-28 13:43 UTCEPSS rescore
  24. 2026-05-28 13:43 UTCEPSS rescore
  25. 2026-05-25 03:20 UTCEG score recompute
  26. 2026-05-25 03:20 UTCVendor advisory
  27. 2026-05-25 03:20 UTCGHSA enrichment

Publicly available exploits

(5 references)

Working exploit code is in the public domain (1 Metasploit module) (4 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCshootweb/CVE-2023-21554
    First seen Oct 9, 2025

    CVE-2023-21554 PoC

    Open source ↗
  • GitHub PoCleongxudong/MSMQ-Vulnerability
    First seen Mar 31, 2025

    Documentation and PoC for CVE-2023-21554 MSMQ Vulnerability

    Open source ↗
  • GitHub PoC3tternp/CVE-2023-21554
    First seen Aug 17, 2023
    Open source ↗
  • GitHub PoCzoemurmure/CVE-2023-21554-PoC
    First seen May 18, 2023

    CVE-2023-21554 Windows MessageQueuing PoC，分析见 https://www.zoemurmure.top/posts/cve_2023_21554/

    Open source ↗
  • Metasploitauxiliary/scanner/msmq/cve_2023_21554_queuejumper✓ verified
    First seen Apr 11, 2023

    CVE-2023-21554 - QueueJumper - MSMQ RCE Check

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2023-21554?
CVE-2023-21554 is a critical vulnerability published on April 11, 2023. Microsoft Message Queuing (MSMQ) Remote Code Execution Vulnerability
When was CVE-2023-21554 disclosed?
CVE-2023-21554 was first published in the National Vulnerability Database on April 11, 2023, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-21554 actively exploited?
CVE-2023-21554 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 95% probability of exploitation in the next 30 days, which ranks it in the top 0.1% of all scored CVEs.
What is the CVSS score of CVE-2023-21554?
CVE-2023-21554 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2023-21554?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-21554, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2023-21554

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