Security readout for executives and security teams
Plain-English summary
Dell EMC PowerFlex 3.5.x has a WebUI issue where an attacker could trick a signed-in user into unwanted actions through WebSocket handling. The main business risk is unauthorized operational changes or disruption to PowerFlex management, not theft of data. The attacker still needs user interaction.
Executive priority
Treat as a moderate operational risk for PowerFlex environments. Prioritize systems where storage management availability is business-critical or where administrators access the WebUI from less controlled workstations. Confirm vendor guidance before scheduling remediation.
Technical view
CVE-2021-21588 is a Cross-Site WebSocket Hijacking issue in the PowerFlex 3.5.x Presentation Server/WebUI. The CVSS 3.1 vector is AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H, indicating network reachability, no attacker privileges, required user interaction, and high availability impact.
Likely exposure
Exposure is limited to organizations running Dell EMC PowerFlex 3.5.x with the Presentation Server/WebUI accessible to users who can be socially engineered. Risk increases if administrators use the WebUI from general-purpose browsers or if the management interface is reachable beyond trusted networks.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation. Exploitation requires tricking a user into performing unwanted actions. The CVE record supports potential configuration changes, but it does not provide public evidence of exploitation in the wild.
Researcher notes
The public data names CWE-345 and describes Cross-Site WebSocket Hijacking in the Presentation Server/WebUI. The CVSS vector emphasizes availability impact despite the description mentioning unwanted configuration actions. No exploit details, fixed version, or active exploitation evidence are present in the provided bundle.
Mitigation direction
- Check Dell advisory 000189265 for supported updates or mitigations.
- Apply Dell-recommended remediation for affected PowerFlex 3.5.x deployments.
- Restrict Presentation Server/WebUI access to trusted management networks.
- Avoid active admin sessions while browsing untrusted sites.
- Monitor PowerFlex configuration changes for unexpected activity.
Validation and detection
- Inventory PowerFlex deployments and identify any 3.5.x instances.
- Confirm whether Presentation Server/WebUI is enabled and reachable.
- Review Dell advisory 000189265 against installed versions.
- Check administrative logs for unexplained configuration changes.
- Verify management UI access is restricted to trusted paths.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-345: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-21588 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.dell.com/support/kbdoc/000189265CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Insufficient Verification of Data Authenticity
Insufficient Verification of Data Authenticity represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.