This High severity DoS (Denial of Service) vulnerability was introduced in versions 8.9.0, 8.19.0, and 9.3.0 of Bitbucket Data Center.

This DoS (Denial of Service) vulnerability, with a CVSS Score of 7.5, allows an unauthenticated attacker to cause a resource to be unavailable for its intended users by temporarily or indefinitely disrupting services of a host connected to a network which has no impact to confidentiality, no impact to integrity, high impact to availability, and requires no user interaction.

Atlassian recommends that Bitbucket Data Center customers upgrade to latest version, if you are unable to do so, upgrade your instance to one of the specified supported fixed versions:

• Bitbucket Data Center 8.9: Upgrade to a release greater than or equal to 8.9.22

• Bitbucket Data Center 8.19: Upgrade to a release greater than or equal to 8.19.12

• Bitbucket Data Center 9.3: Upgrade to a release greater than or equal to 9.3.2

• Bitbucket Data Center 9.4: Upgrade to a release greater than or equal to 9.4.0

See the release notes (https://confluence.atlassian.com/bitbucketserver/release-notes). You can download the latest version of Bitbucket Data Center from the download center (https://www.atlassian.com/software/bitbucket/download-archives).

This vulnerability was reported via our Atlassian (Internal) program.