CVE-2023-54355Network attack vector

Unauthenticated server crash via unchecked EC curve

Published Sep 9, 2026 · Updated Sep 10, 2026

Improper key validation in PocketMine-MP 5.2.0 through 5.3.0 allows remote attackers to crash the server via a crafted LoginPacket. The login-chain verifier accepts an identityPublicKey without confirming that it is an EC key on secp384r1, after which ECDH processing throws an uncaught exception for incompatible keys. No prior account or user interaction is required; one accepted key on another curve or of a non-EC type interrupts the service.

CVSS severity7.5
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper key validation in PocketMine-MP 5.2.0 through 5.3.0 allows remote attackers to crash the server via a crafted LoginPacket. The login-chain verifier accepts an identityPublicKey without confirming that it is an EC key on secp384r1, after which ECDH processing throws an uncaught exception for incompatible keys. No prior account or user interaction is required; one accepted key on another curve or of a non-EC type interrupts the service.

The record

CVE
CVE-2023-54355
Published
Sep 9, 2026
Updated
Sep 10, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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