Crowd Data Center and Server update for Apache Tomcat

1) Improper error handling

EUVDB-ID: #VU107996

Risk: Medium

CVSSv4.0: 7.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2025-31650

CWE-ID: CWE-388 - Error Handling

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient error handling for certain invalid HTTP priority headers. A remote attacker can send a large amount of specially crafted HTTP requests to the server and consume all available memory, resulting in a denial of service condition.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Crowd: 6.0.0 - 6.3.0

Crowd Data Center: 6.0.0 - 6.3.0

CPE2.3

• cpe:2.3:a:atlassian:crowd:6.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:atlassian:crowd:6.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:atlassian:crowd:6.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:atlassian:crowd:6.0.3:*:*:*:*:*:*:*
• cpe:2.3:a:atlassian:crowd:6.0.4:*:*:*:*:*:*:*
• cpe:2.3:a:atlassian:crowd:6.0.6:*:*:*:*:*:*:*
• cpe:2.3:a:atlassian:crowd:6.0.7:*:*:*:*:*:*:*
• cpe:2.3:a:atlassian:crowd:6.0.9:*:*:*:*:*:*:*
• cpe:2.3:a:atlassian:crowd:6.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:atlassian:crowd:6.1.1:*:*:*:*:*:*:*
• cpe:2.3:a:atlassian:crowd_data_center:6.0.0:*:*:*:*:*:*:*

External links

https://jira.atlassian.com/browse/CWD-6360

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.