# CVE-2023-54355

## Summary

- **CVE ID:** CVE-2023-54355
- **Severity:** HIGH
- **CVSS Score:** 8.7 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-347
- **Published:** Sep 9, 2026
- **Last Modified:** Sep 9, 2026

## Description

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.

## Affected Products

No affected products listed.

## References

- [CNA](https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-79rc-jjh6-rc89)
- [CNA](https://github.com/pmmp/PocketMine-MP/commit/4e646d19a4a1e0d082bd4d1f5a58ae0182a268d9)
- [CNA](https://www.vulncheck.com/advisories/pocketmine-mp-5.2.0-server-crash-via-incorrect-ec-curve)

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._