CVE-2024-21689: Atlassian Bamboo RCE Vulnerability

CVE-2024-21689 Overview

CVE-2024-21689 is a Remote Code Execution (RCE) vulnerability affecting Atlassian Bamboo Data Center and Server. The flaw was introduced in versions 9.1.0, 9.2.0, 9.3.0, 9.4.0, 9.5.0, and 9.6.0. An authenticated attacker can execute arbitrary code on affected instances, provided a user interacts with the malicious payload. Successful exploitation yields high impact to confidentiality, integrity, and availability. The vulnerability was reported through Atlassian's Bug Bounty program and mapped to [CWE-94] Improper Control of Generation of Code (Code Injection).

Critical Impact
Authenticated attackers can execute arbitrary code on Bamboo Data Center and Server, compromising build pipelines, source code, and connected CI/CD infrastructure.

Affected Products

Atlassian Bamboo Data Center and Server 9.1.x, 9.2.x, 9.3.x, 9.4.x, 9.5.x
Atlassian Bamboo Data Center and Server 9.2.0 through 9.2.16
Atlassian Bamboo Data Center and Server 9.6.0 through 9.6.4

Discovery Timeline

2024-08-20 - CVE-2024-21689 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-21689

Vulnerability Analysis

CVE-2024-21689 is a code injection weakness [CWE-94] within Atlassian Bamboo Data Center and Server. An authenticated attacker with low privileges can trigger the flaw over the network to execute arbitrary code within the Bamboo process context. Successful exploitation requires user interaction, typically by inducing a privileged user to visit or interact with an attacker-controlled resource.

Because Bamboo orchestrates build and release pipelines, code execution on the server exposes build artifacts, source repositories, deployment credentials, and downstream production targets. An attacker who compromises Bamboo can poison builds, exfiltrate signing keys, and pivot into connected systems. The vulnerability affects Bamboo Data Center and Server only; Atlassian Cloud instances are not in scope.

Root Cause

The root cause is improper control of code generation within Bamboo Data Center and Server, allowing attacker-supplied input to be interpreted as executable code. Atlassian has not publicly released the technical specifics of the injection sink. Details are tracked in the Atlassian Jira Ticket BAM-25858.

Attack Vector

Exploitation requires network access to a vulnerable Bamboo instance, valid low-privileged credentials, and user interaction with a crafted request or resource. Once triggered, the payload executes in the security context of the Bamboo application, granting the attacker the same access as the Bamboo service account. No verified public proof-of-concept code is available at the time of writing. Refer to the Atlassian security advisory for the vendor's technical description.

Detection Methods for CVE-2024-21689

Indicators of Compromise

Unexpected child processes spawned by the Bamboo Java process, such as shells, curl, wget, or scripting interpreters.
Anomalous outbound network connections from the Bamboo server to unknown or untrusted hosts.
New or modified build plans, agents, or scheduled tasks created by low-privileged accounts.
Unusual file writes under Bamboo's home, plugin, or temporary directories.

Detection Strategies

Monitor Bamboo application logs for authenticated requests that immediately precede process or file system anomalies.
Correlate authentication events with administrative or configuration changes performed shortly after login by low-privileged users.
Deploy endpoint behavioral detection on Bamboo hosts to flag process lineage anomalies from the Java runtime.

Monitoring Recommendations

Baseline normal Bamboo process behavior and alert on deviations, including outbound DNS and HTTP traffic.
Forward Bamboo access, audit, and system logs to a centralized SIEM for retention and correlation.
Track version and patch level of all Bamboo Data Center and Server instances via configuration management.

How to Mitigate CVE-2024-21689

Immediate Actions Required

Upgrade Bamboo Data Center and Server 9.2.x to version 9.2.17 or later.
Upgrade Bamboo Data Center and Server 9.6.x to version 9.6.5 or later.
Restrict network access to Bamboo instances so that only trusted users and networks can authenticate.
Rotate credentials, API tokens, and signing keys stored in Bamboo if compromise is suspected.

Patch Information

Atlassian recommends upgrading Bamboo Data Center and Server to the latest available release. Fixed versions are 9.2.17 and later for the 9.2 branch, and 9.6.5 and later for the 9.6 branch. See the Bamboo release notes and the Atlassian download archives for downloads. Additional advisory details are available in the Atlassian security advisory.

Workarounds

No official vendor workaround is provided; upgrading to a fixed version is required.
Reduce risk by limiting Bamboo user accounts and enforcing least privilege on all authenticated roles.
Place Bamboo behind a VPN or reverse proxy with strict access controls until patching is completed.

bash

# Verify Bamboo version after upgrade
curl -s -u admin:<token> https://bamboo.example.com/rest/api/latest/info | jq '.version'

# Expected output for patched 9.6 branch: "9.6.5" or higher
# Expected output for patched 9.2 branch: "9.2.17" or higher