CVE-2026-49813: Dell PowerProtect Data Domain OS Command Injection Vulnerability

Technical summary

The vulnerability is classified as OS command injection (CWE-78), stemming from improper neutralization of special shell metacharacters or command separators in user-supplied input processed by system commands. The affected versions fail to adequately sanitize or escape user input before passing it to OS-level command execution functions. An attacker with administrative privileges and local system access could craft malicious input that breaks out of the intended command context and injects arbitrary shell commands, resulting in code execution with the privileges of the Data Domain service or administrative user context. The CVSS 3.1 vector (AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H) reflects local-only attack surface, high privilege requirement, but unrestricted confidentiality, integrity, and availability impact once exploitation succeeds.

Business impact

Data Domain appliances serve as critical backup targets in enterprise environments, often holding deduplicated copies of all organizational data. Compromise through OS command injection could allow an insider or previously-compromised administrator to: encrypt or delete backups for extortion or data destruction; exfiltrate sensitive data before destruction; modify backup metadata to hide tracks; or establish persistence for long-term unauthorized access. The loss or corruption of backup infrastructure can directly enable ransomware attacks by eliminating recovery options, making this vulnerability relevant to business continuity and disaster recovery posture even though direct remote exploitation is not possible.

Affected systems

Dell PowerProtect Data Domain versions 7.7.1.0–8.7 (standard track), 8.6.1.0–8.6.1.10 (LTS2026), 8.3.1.0–8.3.1.30 (LTS2025), and 7.13.1.0–7.13.1.70 (LTS2024) are affected. Organizations running Data Domain as a backup target or deduplication appliance should inventory their deployed versions immediately. Verify against Dell's official advisory for the precise version boundaries and any interim patch releases that may have been published after this vulnerability disclosure.

Exploitability

Exploitation requires two significant barriers: the attacker must already possess high-level administrative credentials or root-equivalent access to the Data Domain system, and they must have local network or physical access to execute commands. This substantially limits the attack surface compared to unauthenticated or remotely exploitable flaws. However, the vulnerability is not listed on CISA's Known Exploited Vulnerabilities (KEV) catalog, meaning no public weaponized exploit or active exploitation campaign has been documented at the time of publication. The low attack complexity (AC:L) indicates that once access is obtained, exploitation is straightforward and does not require special timing or user interaction.

Remediation

Dell has released patched versions for all affected release tracks. Organizations should: (1) consult Dell's official security advisory to identify the specific patch version applicable to your release track and current version; (2) plan patching within change management windows, as Data Domain appliances often support online updates; (3) prioritize systems that are exposed to untrusted administrator accounts or shared administrative environments; (4) consider interim mitigations such as restricting local console access, disabling unnecessary remote management interfaces, and enforcing strong authentication. Verify patch availability and deployment procedures directly with Dell support or the published advisory.

Patch guidance

Dell will provide patch versions for each affected release track (standard, LTS2026, LTS2025, LTS2024). Consult the official Dell PowerProtect Data Domain security advisory for the minimum patched version number for your specific branch. Typically, patching a Data Domain appliance involves: reviewing the patch release notes for compatibility notes or breaking changes; scheduling a maintenance window (many Data Domain configurations support live patching without full outage); downloading the patch from Dell's support portal; and following Dell's documented upgrade procedure. Before patching, backup your Data Domain configuration and metadata to an external system. Test patches in a non-production environment if feasible.

Detection guidance

Security teams should: (1) monitor Data Domain system logs and authentication logs for unusual administrative login attempts, especially from unexpected IP addresses or times; (2) audit command execution logs and shell history if exposed via local access, looking for suspicious metacharacters (|, &, ;, $(), backticks) in command inputs; (3) implement file integrity monitoring on critical Data Domain binaries and configuration files to detect unauthorized modification; (4) correlate Data Domain administrative activity with unusual backup job modifications, retention policy changes, or data access patterns that might indicate post-exploitation activity; (5) leverage Dell's own diagnostic tools (reports, audit logs) to review administrative actions in the days or weeks before a suspected compromise. Note that detection may be limited if an attacker with administrative access deliberately obscures their tracks or operates during maintenance windows.

Why prioritize this

Although this vulnerability carries a MEDIUM CVSS score and requires high privilege and local access, it should be prioritized based on the criticality of Data Domain systems to overall business resilience. Backup infrastructure compromise directly enables ransomware and data destruction attacks, amplifying the impact of other security incidents. Organizations with untrusted or shared administrator accounts, legacy access management, or data centers with loose physical security should treat this as higher priority. The absence of known public exploitation provides a window for proactive patching before threat actors develop or deploy weaponized exploits targeting this vector.

Risk score, explained

CVSS 3.1 score of 6.7 (MEDIUM) reflects high confidentiality, integrity, and availability impact (all H) but is tempered by the requirement for local attack vector and high-level privileges. This scoring is appropriate for a local privilege escalation or abuse scenario within a trusted admin context. However, the *contextual* risk to an organization may be significantly higher if: backup infrastructure is a known target of adversaries planning ransomware campaigns; administrative access is not tightly controlled; or the Data Domain contains sensitive regulated data (PII, financial records, healthcare information). Use CVSS as a baseline, then adjust prioritization based on your threat landscape and data classification.

Frequently asked questions