CVE-2025-57789: 
Commvault vulnerability analysis and mitigation

CVE-2025-57789 is a default credential vulnerability in Commvault (CommCell) that allows remote attackers to gain administrative control during the brief window between software installation and the first administrator login. The vulnerability affects Commvault versions before 11.36.60, specifically CommCell versions 11.32.0–11.32.101 and 11.36.0–11.36.59. It was published on August 20, 2025, with a patch released in version 11.36.60. The vulnerability carries a CVSS v3.1 score of 5.4 (Medium) and a CVSS v4.0 score of 5.3 (Medium) (Commvault Advisory, Red Hat CVE).

The root cause is classified as CWE-257 (Storing Passwords in a Recoverable Format), stemming from Commvault's use of a predictable or hardcoded default credential during the initial setup phase. An attacker with network access and low-level credentials can authenticate using the default admin credential before the legitimate administrator has completed the first login and changed it. Exploitation is limited to the post-installation, pre-configuration window — once any jobs are configured or the admin account is properly set up, the attack surface closes. The vulnerability is network-exploitable with low attack complexity and no user interaction required (Commvault Advisory, watchTowr Labs).

Successful exploitation during the setup window could grant an attacker full administrative control over the Commvault CommCell environment, enabling unauthorized system configuration, access to backup data, and potential data exfiltration. Because Commvault manages enterprise backup and recovery infrastructure, administrative compromise could expose sensitive organizational data stored in backups and facilitate lateral movement across the environment. Availability impact is rated as none, but confidentiality and integrity are both assessed as low in isolation; however, chaining this vulnerability with other Commvault flaws (such as those disclosed concurrently) could enable pre-authentication remote code execution (watchTowr Labs, Field Effect).

There is no public proof-of-concept exploit specifically for CVE-2025-57789, and no confirmed in-the-wild exploitation has been reported as of the time of disclosure. However, the vulnerability has been incorporated into detection templates for Nuclei (ProjectDiscovery), Qualys (QID 732941), and Nessus (Plugin 253649), indicating active scanner coverage. The EPSS score is approximately 0.030 (3%), reflecting a relatively low but non-negligible probability of exploitation. The vulnerability is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. Notably, watchTowr Labs demonstrated that this and related Commvault vulnerabilities can be chained into pre-authentication RCE exploit chains (watchTowr Labs, Field Effect).

1. Reconnaissance: Identify internet-facing or network-accessible Commvault CommCell instances running versions prior to 11.36.60 using tools like Shodan, Censys, or Nuclei with the CVE-2025-57789 detection template.
2. Timing the attack: Determine whether the target system is in its initial setup phase — i.e., recently installed and not yet configured with jobs or a changed admin password. This may be inferred from deployment logs, network traffic patterns, or by probing the login interface for default credential acceptance.
3. Authenticate with default credentials: Attempt to log in to the Commvault web console or API using the known default administrator credentials present immediately after installation.
4. Gain admin control: Upon successful authentication, the attacker has full administrative access to the CommCell environment, enabling configuration changes, data access, or chaining with additional vulnerabilities (e.g., for RCE) before the legitimate administrator completes setup (watchTowr Labs, Commvault Advisory).

• Network: Unexpected authentication attempts or successful logins to the Commvault web console or REST API from external or unfamiliar IP addresses during the installation/setup window; HTTP requests to Commvault admin endpoints shortly after deployment.
• Logs: Commvault audit logs showing admin login events from unexpected sources immediately after installation, before the legitimate administrator has logged in; authentication success events using default credentials.
• Process/Configuration: Unexpected configuration changes in CommCell (new schedules, jobs, or user accounts) created before the initial administrator setup is complete.
• Scanner Activity: Detection of Nuclei template http/cves/2025/CVE-2025-57789.yaml hits in web application firewall or IDS logs (Commvault Advisory, watchTowr Labs).

Commvault has released a patch in version 11.36.60, which resolves the default credential vulnerability. Organizations should upgrade to version 11.36.60 or later immediately. As interim mitigations: restrict network access to the Commvault management interface during installation, complete the initial administrator login and credential change as quickly as possible after deployment, and monitor for unauthorized login attempts during the setup phase. Avoid exposing the Commvault console to untrusted networks during installation (Commvault Advisory, CIS Advisory).

watchTowr Labs published a detailed technical blog demonstrating how CVE-2025-57789 and related Commvault vulnerabilities can be chained into pre-authentication RCE exploit chains, generating significant attention in the security community (watchTowr Labs). Coverage appeared in The Register, The Hacker News, Help Net Security, and Computer Weekly, with headlines emphasizing the RCE chaining risk and urging immediate patching (The Register, The Hacker News, Help Net Security). The Canadian Centre for Cyber Security and CIS both issued advisories, and the vulnerability was highlighted in The Hacker News weekly recap, reflecting broad industry concern about the chained exploitation potential (Canadian CCCS, CIS Advisory).