What is CVE-2023-54355?

CVE-2023-54355 is a high-severity vulnerability, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2026-09-09.

How severe is CVE-2023-54355?

High severity. CVSS v3 base score is 7.5 out of 10.

CVE-2023-54355

CVE-2023-54355

PocketMine-MP versions before 5.3.1 and 4.23.1 fail to validate that the identityPublicKey in LoginPacket uses the required secp384r1 elliptic curve. Attackers can provide LoginPackets with keys using different curves or non-EC key types to pass login verification but trigger an uncaught exception during ECDH key derivation, crashing the server.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2023-54355?: CVE-2023-54355 is a high-severity vulnerability, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2026-09-09.
How severe is CVE-2023-54355?: High severity. CVSS v3 base score is 7.5 out of 10.