CVE-2025-30472
Description
A flaw was found in Corosync. In affected versions, a stack-based buffer overflow may be triggered via a large UDP packet in configurations where encryption is disabled or if an attacker knows the encryption key. This issue can lead to an application crash or other undefined behavior.
Statement
Red Hat believes this vulnerability to be of Moderate impact because successful exploitation requires the attacker to have gained access to the shared secret keys used by the cluster for encrypted communication or for the corosync configuration in the cluster to have encryption and signing disabled, which is a non-standard configuration.
Mitigation
To mitigate this vulnerability in RHEL, use pcs to ensure that the corosync configuration used in your cluster(s) has encryption enabled (verify that during setup the `--crypto` option's `cipher` and `hash` parameters are not set to `none`).
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.6 | 9.8 | 9 |
| Attack Vector | Network | Network | Network |
| Attack Complexity | High | Low | High |
| Privileges Required | High | None | None |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Changed |
| Confidentiality | High | High | High |
| Integrity Impact | High | High | High |
| Availability Impact | High | High | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Red Hat CVSS v3 Score Explanation
The attack complexity has been marked as high because to corosync configuration in the cluster to have encryption and signing disabled is a non-standard configuration, which is why the CVSS has been marked as such.
Understanding the Weakness (CWE)
Availability
Technical Impact: Modify Memory; DoS: Crash, Exit, or Restart; DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory)
Buffer overflows generally lead to crashes. Other attacks leading to lack of availability are possible, including putting the program into an infinite loop.
Integrity,Confidentiality,Availability,Access Control
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands; Bypass Protection Mechanism
Buffer overflows often can be used to execute arbitrary code, which is usually outside the scope of a program's implicit security policy.
Integrity,Confidentiality,Availability,Access Control,Other
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands; Bypass Protection Mechanism; Other
When the consequence is arbitrary code execution, this can often be used to subvert any other security service.
Frequently Asked Questions
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