What’s Vulnerable › Vulnerabilities

CVE-2025-58447: rAthena has heap-based buffer overflow in login server

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-09 · updated 2026-10-19
• Weakness: CWE-122

Description

rAthena is an open-source cross-platform massively multiplayer online role playing game (MMORPG) server. Versions prior to commit 2f5248b have a heap-based buffer overflow in the login server, remote attacker to overwrite adjacent session fields by sending a crafted `CA_SSO_LOGIN_REQ` with an oversized token length. This leads to immediate denial of service (crash) and it is possible to achieve remote code execution via heap corruption. Commit 2f5248b fixes the issue.

Affected products

• rathena: before 2025-09-06 — fixed in 2025-09-06

How to fix

Upgrade to a fixed version: rathena 2025-09-06. Check the vendor advisory for mitigations.

References

• https://github.com/rathena/rathena/commit/2f5248b9cd9a8c6b42422ddecfc4cc2cd0e69e4b
• https://github.com/rathena/rathena/security/advisories/GHSA-4p33-6xqr-cm6x

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