CVE-2026-40641 Overview
CVE-2026-40641 affects Dell PowerFlex Manager version 4.6.0.1. The vulnerability stems from the use of a broken or risky cryptographic algorithm [CWE-327]. An unauthenticated attacker with remote network access can exploit this weakness to disclose sensitive information and tamper with data in transit.
The flaw carries a CVSS 3.1 base score of 4.8 and impacts both confidentiality and integrity at a low level. Exploitation requires high attack complexity but no privileges or user interaction.
Critical Impact
Successful exploitation enables remote, unauthenticated information disclosure and information tampering against PowerFlex Manager deployments using weak cryptography.
Affected Products
- Dell PowerFlex Manager version 4.6.0.1
- Dell PowerFlex software components covered by advisory DSA-2026-066
- Deployments exposing PowerFlex Manager network services to untrusted networks
Discovery Timeline
- 2026-06-17 - CVE-2026-40641 published to the National Vulnerability Database (NVD)
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2026-40641
Vulnerability Analysis
Dell PowerFlex Manager 4.6.0.1 implements a cryptographic algorithm classified as broken or risky under [CWE-327]. The weakness exposes data protected by the algorithm to attackers capable of observing or interacting with affected network traffic.
Dell PowerFlex Manager orchestrates software-defined storage deployments. Communications channels or stored material protected by the weak algorithm can be analyzed to recover plaintext content or alter messages without detection. The CVE record describes both information disclosure and information tampering as outcomes, indicating that confidentiality and integrity controls both rely on the affected primitive.
The high attack complexity reflects conditions outside the attacker's direct control, such as the need to observe sufficient ciphertext, perform cryptanalysis, or position on the network path. No authentication or user interaction is required.
Root Cause
The root cause is the selection or continued use of a cryptographic algorithm that no longer meets current security expectations. Weak primitives produce predictable outputs, allow key recovery with feasible work, or fail to provide authenticated integrity. Dell has not publicly identified the specific algorithm in the advisory text referenced by NVD.
Attack Vector
The attack vector is Network. A remote, unauthenticated attacker targets PowerFlex Manager network services that depend on the weak cryptographic algorithm. The attacker collects protected data or injects modified content, then leverages the algorithm weakness to derive plaintext or forge valid ciphertext. See the Dell Security Update DSA-2026-066 for vendor-supplied technical context.
Detection Methods for CVE-2026-40641
Indicators of Compromise
- Unexpected TLS or application-layer negotiations selecting deprecated cipher suites against PowerFlex Manager endpoints
- Repeated client connections from a single source collecting large volumes of encrypted PowerFlex Manager traffic
- Anomalous modifications to PowerFlex Manager configuration data or API responses not matching internal change records
Detection Strategies
- Inventory PowerFlex Manager installations and confirm the running version against 4.6.0.1
- Inspect network captures for use of legacy or weak ciphers in sessions terminating on PowerFlex Manager hosts
- Correlate authentication and configuration change logs with network traffic to identify tampering attempts
Monitoring Recommendations
- Forward PowerFlex Manager application, audit, and TLS handshake logs to a centralized analytics platform
- Alert on cryptographic negotiation downgrades or use of algorithms flagged by the organization's cryptographic policy
- Monitor for unauthenticated network connections to management interfaces from outside trusted administrative ranges
How to Mitigate CVE-2026-40641
Immediate Actions Required
- Identify all Dell PowerFlex Manager 4.6.0.1 instances within the environment
- Restrict network access to PowerFlex Manager management interfaces to trusted administrative networks only
- Apply the security update referenced in Dell advisory DSA-2026-066 as soon as it is available for the deployment
Patch Information
Dell has published Dell Security Update DSA-2026-066, which addresses multiple vulnerabilities in PowerFlex software including CVE-2026-40641. Administrators should follow the vendor advisory for the specific fixed version and upgrade procedure applicable to PowerFlex Manager.
Workarounds
- Place PowerFlex Manager behind a network segment accessible only via VPN or jump host until patching is complete
- Enforce strict firewall rules limiting source IP addresses permitted to reach management endpoints
- Disable or restrict any optional services or protocols that rely on the weak cryptographic algorithm where vendor guidance permits
# Configuration example: restrict management access at the host firewall
iptables -A INPUT -p tcp --dport 443 -s 10.10.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
