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CVE-2023-54393

PocketMine-MP before 4.20.5 Denial of Service via LoginPacket

HIGH
7.5
CVSS Score
Published: September 9, 2026 at 01:31 PM UTC
Updated: October 8, 2026 at 04:16 PM UTC
1 product affected across 1 vendorPocketMine-MP

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Severity
HIGH7.5
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

PocketMine-MP· Pmmp
90%
0 ≤ v < 4.20.54.21.0 ≤ v < 4.21.104.21.0
Affected range stops below 4.20.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.21.1, so it looks safe — our inference, not a vendor statement

References (4)

Vendor Advisory
Source: cverecord
https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-pqp3-8rrw-g8vm
Patch
Source: cverecord
https://github.com/pmmp/PocketMine-MP/commit/a31902a31f5b6fdb832f57c0e3a3f16a3b41c012
Patch
Source: cverecord
https://github.com/pmmp/PocketMine-MP/commit/09668a37d66c6023685a948b7550c918620e98f2
Third Party Advisory
Source: cverecord
https://www.vulncheck.com/advisories/pocketmine-mp-before-4.20.5-denial-of-service-via-loginpacket

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHVulnCheck
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-20

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