Security readout for executives and security teams
Plain-English summary
This vulnerability can let a logged-in local user disrupt systems using Intel(R) 82599 Ethernet Controllers and Adapters. The reported impact is denial of service, not data theft or remote takeover. Business urgency depends on whether exposed systems allow untrusted local users or shared tenant access.
Executive priority
Prioritize assessment where Intel 82599 adapters support critical services, shared infrastructure, or systems with multiple local users. This is not a confirmed remote compromise issue, but availability disruption on network infrastructure can still create operational impact.
Technical view
CVE-2021-33096 is an improper isolation issue in shared network-on-chip resources for Intel(R) 82599 Ethernet Controllers and Adapters. CVSS 3.1 is 5.5, with local access, low complexity, low privileges, no user interaction, and high availability impact.
Likely exposure
Exposure is most likely on servers, appliances, or virtualization hosts that physically use Intel(R) 82599 Ethernet Controllers or Adapters and allow local authenticated users. The bundle does not provide exact affected versions or downstream product lists beyond referenced advisories.
Exploitation context
The source bundle supports only local authenticated denial-of-service potential. It does not show remote exploitation, public exploit availability, or CISA KEV listing. Treat active exploitation as unconfirmed unless Intel, CISA, or an affected platform vendor states otherwise.
Researcher notes
Key constraints are local access and low privileges, with availability-only impact. CWE-668 aligns with improper shared-resource isolation. Public details in the provided bundle are limited, so avoid claims about exact triggers, affected firmware ranges, or exploitability beyond vendor statements.
Mitigation direction
- Inventory systems using Intel(R) 82599 Ethernet Controllers or Adapters.
- Review Intel SA-00571 for affected-version and remediation guidance.
- Check downstream vendor advisories for appliance-specific exposure and fixes.
- Apply vendor-provided updates or mitigations when explicitly available.
- Limit local shell or administrative access to trusted users only.
Validation and detection
- Confirm hardware models through asset inventory or platform management records.
- Map identified adapters to Intel SA-00571 and vendor advisory scope.
- Check whether affected systems permit non-administrator local authenticated access.
- Review outage history for unexplained network-adapter or host availability failures.
- Document unresolved version or fix gaps for vendor follow-up.
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-668: 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-2021-33096 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
- 5.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/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:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H1.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.5MediumVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00571.htmlCVE reference · x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20220210-0010/CVE reference · x_refsource_CONFIRM
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.
Exposure of Resource to Wrong Sphere
Exposure of Resource to Wrong Sphere represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.