CVE-2025-30472Public exploitNetwork attack vector

Remote code execution via unchecked token entry count

Published Mar 22, 2025 · Updated Nov 3, 2025

Stack-based buffer overflow in Corosync 3.1.9 and earlier allows remote attackers to execute code via a large UDP ORF token. orf_token_endian_convert trusts the packet's rtr_list_entries count and writes converted entries beyond a 1,500-byte token_convert stack buffer. The packet path is reachable when encryption is disabled or the encryption key is known, and exploitation can crash the cluster process or execute code.

CVSS severity9.0
Critical
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Corosync 3.1.9 and earlier allows remote attackers to execute code via a large UDP ORF token. orf_token_endian_convert trusts the packet's rtr_list_entries count and writes converted entries beyond a 1,500-byte token_convert stack buffer. The packet path is reachable when encryption is disabled or the encryption key is known, and exploitation can crash the cluster process or execute code.

The record

CVE
CVE-2025-30472
Published
Mar 22, 2025
Updated
Nov 3, 2025
Vendor
Corosync
Product
Corosync
Classifications
CWE-121, CWE-787, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 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=0 <=3.1.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Corosync · Corosyncversion=0 <=3.1.9

Published CVSS scores

9.0MITRECVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
9.8NVDCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-787Out-of-bounds Write
T1499.004Application or System Exploitation

Public exploit references

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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