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Public Security Vulnerability
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Resolution: Fixed
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Low
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6.2.0, 6.2.2
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None
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None
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7.5
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High
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CVE-2025-24970
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Atlassian (Internal)
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CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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DoS (Denial of Service)
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Crowd Data Center, Crowd Server
This High severity io.netty:netty-handler Dependency vulnerability was introduced in versions 6.2.0 of Crowd Data Center and Server.
This io.netty:netty-handler Dependency vulnerability, with a CVSS Score of 7.5 and a CVSS Vector of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H allows an unauthenticated attacker to cause a denial of service which has a high impact to availability and requires no user interaction.
Atlassian recommends that Crowd Data Center and Server customers upgrade to latest version, if you are unable to do so, upgrade your instance to one of the specified supported fixed versions:
- Crowd Data Center and Server 6.2: Upgrade to a release greater than or equal to 6.2.3
See the release notes (https://confluence.atlassian.com/crowd/crowd-release-notes-199094.html). You can download the latest version of Crowd Data Center and Server from the download center (https://www.atlassian.com/software/crowd/download-archive).
The National Vulnerability Database provides the following description for this vulnerability: Netty, an asynchronous, event-driven network application framework, has a vulnerability starting in version 4.1.91.Final and prior to version 4.1.118.Final. When a special crafted packet is received via SslHandler it doesn't correctly handle validation of such a packet in all cases which can lead to a native crash. Version 4.1.118.Final contains a patch. As workaround its possible to either disable the usage of the native SSLEngine or change the code manually.