Security readout for executives and security teams
Plain-English summary
CVE-2021-42083 affects OSNEXUS QuantaStor 6.0.0.335 according to the supplied record. An authenticated user can abuse alert-management functionality to store malicious input. The source bundle labels it stored XSS, while the provided proof-of-concept text describes root-level command execution, so treat the impact as serious but verify vendor details.
Executive priority
Treat this as high priority for any QuantaStor environment because the described path starts with authenticated access but may lead to severe integrity and confidentiality impact. Confirm exposure quickly, reduce administrator access, and seek vendor remediation guidance.
Technical view
The CVE is scored CVSS 8.7 with network access, low complexity, low privileges, user interaction, and changed scope. It is mapped to CWE-79. The supplied description says an authenticated attacker can create alerts that trigger stored XSS; the included PoC narrative indicates abuse of ITSM webhook fields with root command execution side effects.
Likely exposure
Organizations running OSNEXUS QuantaStor 6.0.0.335 are the clearest exposure. Risk is highest where authenticated users can access alert manager, ITSM, or webhook configuration paths, especially on management interfaces reachable beyond tightly controlled administration networks.
Exploitation context
The source bundle includes public third-party advisory and exploit-tagged references, but CISA KEV status is false and no cited source states active exploitation. The described attack requires authenticated access and some user interaction, but the reported impact includes high confidentiality and integrity risk.
Researcher notes
There is a notable mismatch: the CVE title and CWE describe stored XSS, while the supplied PoC text describes command execution as root through alert webhook handling. Avoid assuming affected versions beyond the supplied QuantaStor 6.0.0.335 reference unless vendor advisories confirm them.
Mitigation direction
- Check OSNEXUS guidance for affected builds, fixed versions, or vendor-approved mitigations.
- Restrict QuantaStor management access to trusted administrators and controlled networks.
- Review alert manager, ITSM, and webhook configurations for suspicious entries.
- Remove untrusted or unexplained alert integrations pending vendor confirmation.
- Prioritize upgrade or remediation planning if running QuantaStor 6.0.0.335.
Validation and detection
- Inventory QuantaStor deployments and confirm exact installed versions.
- Identify who can manage alerts, ITSM settings, and webhooks.
- Review recent alert-management changes for unexpected webhook or token values.
- Check system and application logs for abnormal alert-triggered activity.
- Validate remediation against OSNEXUS or DIVD guidance before closure.
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-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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 lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-42083 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
- High
- CVSS
- 8.7 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
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:L/UI:R/S:C/C:H/I:H/A:N2.35.8Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.7HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wbsec.nl/osnexusCVE reference · third-party-advisory, technical-description
- https://csirt.divd.nl/DIVD-2021-00020/CVE reference · third-party-advisory
- https://www.osnexus.com/products/software-defined-storageCVE reference · product
- https://csirt.divd.nl/CVE-2021-42083CVE reference · third-party-advisory, exploit
- https://www.divd.nl/DIVD-2021-00020CVE reference · third-party-advisory, x_transferred
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.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.