Security readout for executives and security teams
Plain-English summary
CVE-2021-42079 lets a QuantaStor administrator configure alerts so the appliance sends server-side POST requests to attacker-chosen URLs. This can expose internal network information or sensitive response behavior from a trusted storage system, but it requires high privileges and user interaction according to the CVSS vector.
Executive priority
Treat this as a moderate-priority storage management risk. It is not shown as actively exploited here, but public details exist and SSRF from trusted infrastructure can expose sensitive internal environments.
Technical view
The issue is CWE-918 SSRF in OSNEXUS QuantaStor before 6.0.0.355. Authenticated administrators can abuse alert configuration and alert raising behavior to make QuantaStor issue outbound POST requests. CVSS 3.1 is 6.2 with network attack vector, low complexity, high privileges, required user interaction, changed scope, and high confidentiality impact.
Likely exposure
Exposure is most relevant where QuantaStor management interfaces are reachable by administrators and alert integrations can reach internal services or the internet. Internet-exposed management planes raise concern, but the source bundle does not prove unauthenticated exposure.
Exploitation context
The provided sources include public technical detail and proof-of-concept material. CISA KEV status is false in the bundle, and no cited source here confirms active exploitation in the wild.
Researcher notes
Evidence supports authenticated administrator-triggered SSRF through alert behavior. The bundle lists affected versions ambiguously as "0" while the title states before 6.0.0.355; verify vendor records before broad claims. Avoid assuming impact beyond confidentiality without additional evidence.
Mitigation direction
- Identify QuantaStor instances and confirm exact versions against vendor guidance.
- Upgrade QuantaStor to 6.0.0.355 or later if vendor guidance confirms applicability.
- Restrict QuantaStor administration to trusted networks and authorized administrators.
- Limit outbound network access from QuantaStor appliances to approved alert endpoints.
- Review alert webhook, Slack, Mattermost, and support email configurations.
Validation and detection
- Inventory all OSNEXUS QuantaStor appliances and record software versions.
- Check whether any appliance runs a version before 6.0.0.355.
- Review alert configuration for unexpected external or internal URLs.
- Inspect network logs for unusual outbound POST requests from QuantaStor appliances.
- Confirm administrative access is restricted and audited.
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-918: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. 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 lookupCloud metadata behavior lookup
The CVE wording references SSRF or metadata access, so cloud discovery and credential material review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-42079 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
- 6.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:N/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:H/UI:R/S:C/C:H/I:N/A:N1.74Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.2MediumVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wbsec.nl/osnexusCVE reference · third-party-advisory, technical-description
- https://cisrt.divd.nl/DIVD-2021-00020/CVE reference · third-party-advisory, exploit
- https://www.osnexus.com/products/software-defined-storageCVE reference · product
- https://csirt.divd.nl/CVE-2021-42079CVE reference · third-party-advisory
- 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.
Server-Side Request Forgery (SSRF)
Server-Side Request Forgery (SSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.