Security readout for executives and security teams
Plain-English summary
CVE-2021-26254 is a local denial-of-service issue in some Intel PROSet/Wireless WiFi and Killer WiFi products. A user who already has local privileges could trigger an out-of-bounds read that may disrupt availability. This is not a remote compromise issue based on the supplied sources.
Executive priority
Treat this as a routine endpoint remediation item, not an emergency internet-facing incident. It can affect availability on vulnerable systems, so include it in driver patch cycles and prioritize high-value or shared endpoints.
Technical view
The CVE describes CWE-125 out-of-bounds read in affected Intel PROSet/Wireless WiFi and Killer WiFi products. CVSS 3.1 is 5.5: local attack vector, low complexity, low privileges required, no user interaction, unchanged scope, and high availability impact only.
Likely exposure
Exposure is most likely on endpoints using affected Intel PROSet/Wireless WiFi or Killer WiFi software or drivers. The supplied bundle does not list exact vulnerable versions, so teams must map installed versions against Intel SA-00621.
Exploitation context
The sources do not state active exploitation, and the CVE is not listed as KEV in the supplied bundle. Exploitation requires local access and some privilege, reducing broad internet-facing risk but leaving shared workstations and managed endpoints relevant.
Researcher notes
Evidence is concise and version detail is not present in the supplied CVE bundle. Validation should focus on product/version mapping to Intel SA-00621. Do not assume confidentiality or integrity impact; the published vector identifies availability impact only.
Mitigation direction
- Review Intel SA-00621 for affected product and version details.
- Update affected WiFi software or drivers using Intel or OEM guidance.
- Prioritize managed laptops and shared endpoints with local user access.
- Limit unnecessary local privileges on endpoint systems.
- Monitor Intel guidance for any revised affected-version or remediation details.
Validation and detection
- Inventory endpoints with Intel PROSet/Wireless WiFi or Killer WiFi products.
- Compare installed driver and software versions against Intel SA-00621.
- Confirm remediation status through endpoint management or asset tools.
- Check support and EDR telemetry for recurring local WiFi driver crashes.
- Document exceptions where vendor remediation is unavailable or deferred.
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-125: 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-2021-26254 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-00621.htmlCVE 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.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.