CVE-2023-54393

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-09. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

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

PocketMine-MP versions before 4.20.5 contain a denial of service vulnerability in LoginPacket JSON parsing due to improper validation in the JsonMapper dependency. Attackers can send malformed JSON structures in LoginPacket to crash the server.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
29%
KEV
Not listed

Published

September 9, 2026

Last Modified

September 14, 2026

Advisory Details (3)

Auto-updated Sep 9, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit.
generic

PocketMine-MP before 4.20.5 Denial of Service via LoginPacket | Advisories | VulnCheck

https://www.vulncheck.com/advisories/pocketmine-mp-before-4.20.5-denial-of-service-via-loginpacket
github_commit

commit 09668a37d66c (pmmp/PocketMine-MP)

Fix landed in pmmp/PocketMine-MP commit 09668a37d66c — awaiting tagged release

https://github.com/pmmp/PocketMine-MP/commit/09668a37d66c6023685a948b7550c918620e98f2
github Patch Available🟡 PoC Available

Crash with incorrect JSON structures in `LoginPacket` due to dependency bug · Advisory · pmmp/PocketMine-MP · GitHub

https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-pqp3-8rrw-g8vm

Vendor Advisories for CVE-2023-54393(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
pocketmine/pocketmine-mp3.0.0 ... 4.9.1 (263 versions)4.20.5—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 31× in last 7d / 43× 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. 2026-09-19 02:59 UTCEG score recompute
  2. 2026-09-19 02:59 UTCGHSA enrichment
  3. 2026-09-18 19:26 UTCEPSS rescore
  4. 2026-09-18 14:57 UTCGHSA enrichment
  5. 2026-09-18 02:54 UTCEG score recompute
  6. 2026-09-18 02:54 UTCGHSA enrichment
  7. 2026-09-17 14:51 UTCGHSA enrichment
  8. 2026-09-17 02:48 UTCGHSA enrichment
  9. 2026-09-16 14:44 UTCEG score recompute
  10. 2026-09-16 14:44 UTCGHSA enrichment
  11. 2026-09-16 14:06 UTCEPSS rescore
  12. 2026-09-16 05:11 UTCEPSS rescore
  13. 2026-09-16 05:11 UTCEPSS rescore
  14. 2026-09-16 02:41 UTCGHSA enrichment
  15. 2026-09-15 14:38 UTCEG score recompute
  16. 2026-09-15 14:38 UTCGHSA enrichment
  17. 2026-09-15 03:08 UTCEPSS rescore
  18. 2026-09-15 02:34 UTCGHSA enrichment
  19. 2026-09-14 14:31 UTCEG score recompute
  20. 2026-09-14 14:31 UTCGHSA enrichment
  21. 2026-09-14 13:36 UTCEG score recompute
  22. 2026-09-14 13:36 UTCGHSA enrichment
  23. 2026-09-14 09:09 UTCGHSA enrichment
  24. 2026-09-13 21:06 UTCEG score recompute
  25. 2026-09-13 21:06 UTCGHSA enrichment
Show 18 more
  1. 2026-09-13 16:45 UTCEPSS rescore
  2. 2026-09-13 09:03 UTCGHSA enrichment
  3. 2026-09-12 21:01 UTCEG score recompute
  4. 2026-09-12 21:01 UTCGHSA enrichment
  5. 2026-09-12 14:58 UTCEPSS rescore
  6. 2026-09-12 08:58 UTCGHSA enrichment
  7. 2026-09-11 20:55 UTCEG score recompute
  8. 2026-09-11 20:55 UTCGHSA enrichment
  9. 2026-09-11 14:51 UTCEPSS rescore
  10. 2026-09-11 09:34 UTCEPSS rescore
  11. 2026-09-11 08:52 UTCGHSA enrichment
  12. 2026-09-10 20:49 UTCGHSA enrichment
  13. 2026-09-10 08:46 UTCGHSA enrichment
  14. 2026-09-09 20:44 UTCEG score recompute
  15. 2026-09-09 20:43 UTCGHSA enrichment
  16. 2026-09-09 14:27 UTCEG score recompute
  17. 2026-09-09 13:36 UTCEG score recompute
  18. 2026-09-09 13:34 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2023-54393?
CVE-2023-54393 is a high vulnerability published on September 9, 2026. PocketMine-MP versions before 4.20.5 contain a denial of service vulnerability in LoginPacket JSON parsing due to improper validation in the JsonMapper dependency. Attackers can send malformed JSON structures in LoginPacket to crash the server.
When was CVE-2023-54393 disclosed?
CVE-2023-54393 was first published in the National Vulnerability Database on September 9, 2026, with the most recent update on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-54393 actively exploited?
CVE-2023-54393 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 71.3% of all scored CVEs.
What is the CVSS score of CVE-2023-54393?
CVE-2023-54393 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2023-54393?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-54393, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2023-54393

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