CVE-2025-58447Network attack vector

Unauthenticated code execution via oversized SSO token

Published Sep 9, 2025 · Updated Sep 10, 2025

Heap-based buffer overflow in the rAthena login server before commit 2f5248b allows remote attackers to crash it or execute code. logclif_parse_reqauth_sso derives a safestrncpy length from the declared CA_SSO_LOGIN_REQ packet length instead of the 33-byte destination, overwriting adjacent login_session_data fields. The login service accepts the dynamic-size packet before authentication, so network access to it is sufficient for a service crash or heap-corruption code execution.

CVSS severity9.8
Critical
EPSS probability0.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in the rAthena login server before commit 2f5248b allows remote attackers to crash it or execute code. logclif_parse_reqauth_sso derives a safestrncpy length from the declared CA_SSO_LOGIN_REQ packet length instead of the 33-byte destination, overwriting adjacent login_session_data fields. The login service accepts the dynamic-size packet before authentication, so network access to it is sufficient for a service crash or heap-corruption code execution.

The record

CVE
CVE-2025-58447
Published
Sep 9, 2025
Updated
Sep 10, 2025
Vendor
rAthena
Product
rAthena
Classifications
CWE-122, CWE-787, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2f5248b

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

rAthena · rAthenaversion=< 2f5248b

Published CVSS scores

9.8GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
CWE-787Out-of-bounds Write
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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