CVE-2025-60021: Apache bRPC RCE Vulnerability

CVE-2025-60021 Overview

CVE-2025-60021 is a critical remote command injection vulnerability affecting the heap profiler built-in service in Apache bRPC. The vulnerability exists in all versions prior to 1.15.0 and allows unauthenticated attackers to execute arbitrary commands on affected systems through the /pprof/heap endpoint by exploiting insufficient input validation of the extra_options parameter.

This command injection flaw is particularly dangerous because it requires no authentication, can be exploited remotely over the network, and grants attackers complete control over the target system. Organizations using Apache bRPC for their RPC framework implementations should treat this vulnerability with the highest priority.

Critical Impact

Unauthenticated remote attackers can execute arbitrary system commands on Apache bRPC servers, potentially leading to complete system compromise, data exfiltration, and lateral movement within affected networks.

Affected Products

• Apache bRPC (all versions prior to 1.15.0)
• Systems using the built-in bRPC heap profiler service for jemalloc memory profiling
• Any platform running vulnerable Apache bRPC versions with the /pprof/heap endpoint exposed

Discovery Timeline

• January 16, 2026 - CVE-2025-60021 published to NVD
• January 21, 2026 - Last updated in NVD database

Technical Details for CVE-2025-60021

Vulnerability Analysis

The vulnerability resides in Apache bRPC's built-in heap profiler service, specifically at the /pprof/heap endpoint. This service is designed to facilitate jemalloc memory profiling for debugging and performance analysis purposes. However, the implementation fails to properly sanitize user-controlled input before incorporating it into command execution.

When a user supplies the extra_options parameter to the heap profiler endpoint, the service accepts this input and directly passes it as a command-line argument without any validation or sanitization. This architectural flaw creates a direct pathway for command injection attacks. An attacker can craft malicious payloads within the extra_options parameter that escape the intended context and execute arbitrary system commands with the privileges of the bRPC service process.

The vulnerability is classified as CWE-77 (Command Injection), representing a fundamental failure in secure input handling practices. The impact is severe because the service typically runs with elevated privileges to perform memory profiling operations, and successful exploitation grants attackers the same level of access.

Root Cause

The root cause of CVE-2025-60021 is the absence of input validation for the extra_options parameter in the bRPC heap profiler built-in service. The /pprof/heap endpoint accepts user-provided values and directly incorporates them into command-line execution without sanitizing shell metacharacters, escaping special characters, or validating against an allowlist of permitted options.

This design flaw violates the principle of input validation, where all external input should be treated as untrusted and validated before use in sensitive operations like command execution.

Attack Vector

The attack vector is network-based, requiring no authentication or user interaction. An attacker simply needs network access to the vulnerable bRPC service endpoint to exploit this vulnerability.

The exploitation flow involves sending a crafted HTTP request to the /pprof/heap endpoint with a malicious payload in the extra_options parameter. By injecting shell metacharacters and commands into this parameter, attackers can break out of the intended command context and execute arbitrary commands on the underlying operating system.

For example, an attacker might inject shell command separators (such as semicolons or backticks) followed by malicious commands. The heap profiler service would then inadvertently execute these injected commands alongside or instead of the legitimate profiling operation.

Affected scenarios specifically include environments where the built-in bRPC heap profiler service is used to perform jemalloc memory profiling and the /pprof/heap endpoint is reachable by potential attackers. For detailed technical information, refer to the Apache Security Discussion and the Openwall OSS Security Update.

Detection Methods for CVE-2025-60021

Indicators of Compromise

• Unusual HTTP requests to /pprof/heap endpoints containing shell metacharacters such as ;, |, $(), or backticks in the extra_options parameter
• Unexpected child processes spawned by the bRPC service process
• Anomalous outbound network connections originating from bRPC service processes
• System commands executed under the context of the bRPC service user that are inconsistent with normal profiling operations

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block requests containing command injection patterns targeting the /pprof/heap endpoint
• Deploy endpoint detection and response (EDR) solutions to monitor for suspicious process creation chains originating from bRPC services
• Configure intrusion detection systems (IDS) to alert on HTTP requests with shell metacharacters in URL parameters targeting profiler endpoints
• Enable detailed logging for the bRPC service and monitor for abnormal extra_options parameter values

Monitoring Recommendations

• Continuously monitor network traffic to and from systems running Apache bRPC for unusual patterns or connections to known malicious infrastructure
• Implement file integrity monitoring on critical system files to detect modifications resulting from post-exploitation activities
• Establish baseline behavior for bRPC service processes and alert on deviations such as unexpected command executions or network connections
• Review access logs for the /pprof/heap endpoint regularly to identify reconnaissance or exploitation attempts

How to Mitigate CVE-2025-60021

Immediate Actions Required

• Upgrade all Apache bRPC installations to version 1.15.0 or later immediately
• If immediate upgrade is not possible, apply the official patch from GitHub PR #3101 manually
• Restrict network access to the /pprof/heap endpoint using firewall rules or network segmentation to trusted administrative hosts only
• Disable the heap profiler built-in service if it is not required for operations

Patch Information

Apache has released version 1.15.0 of bRPC which addresses this vulnerability. Organizations should prioritize upgrading to this version. For environments where immediate upgrades are not feasible, Apache provides an official patch available at GitHub PR #3101 that can be applied manually to remediate the vulnerability.

The patch introduces proper input validation for the extra_options parameter, preventing the injection of arbitrary commands through the heap profiler endpoint.

Workarounds

• Implement network-level access controls to restrict access to the /pprof/heap endpoint to trusted internal networks or specific administrative IP addresses only
• Deploy a reverse proxy or web application firewall in front of bRPC services to filter and sanitize incoming requests to profiling endpoints
• Disable the bRPC heap profiler service entirely if jemalloc memory profiling is not required for your use case
• Implement runtime application self-protection (RASP) solutions that can detect and block command injection attempts at the application level

# Example: Firewall rule to restrict access to bRPC profiler endpoint
# Allow access only from trusted admin network (adjust IP range as needed)
iptables -A INPUT -p tcp --dport 8080 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 8080 -j DROP

# Example: Nginx reverse proxy configuration to block suspicious requests
# Add to server block protecting bRPC service
location /pprof/heap {
    # Block requests with shell metacharacters in query string
    if ($query_string ~* "[;|`$()]") {
        return 403;
    }
    # Restrict to internal network
    allow 10.0.0.0/24;
    deny all;
    proxy_pass http://brpc_backend;
}