Security readout for executives and security teams
Plain-English summary
On affected vivo devices running Android versions earlier than 10, the Wi-Fi module can expose an interface without proper permission control. This may leak sensitive device information. The public record rates it medium severity and does not show CISA KEV listing or confirmed active exploitation.
Executive priority
Treat this as a targeted mobile exposure issue, not an internet-scale emergency. Prioritize organizations that still allow older vivo devices to access corporate data or sensitive networks.
Technical view
CVE-2021-26278 is a local, user-interaction-required confidentiality issue in vivo's Wi-Fi module. The CVSS v3.1 vector is AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N. The weakness is mapped to CWE-306, indicating missing authentication or improper permission enforcement.
Likely exposure
Exposure appears limited to vivo devices running Android versions earlier than Android 10. The sources do not provide CPEs, model lists, or enterprise deployment details, so inventory validation is required.
Exploitation context
The CVSS vector indicates local access and user interaction are required, with no privileges needed. The provided sources do not report public exploitation, exploit availability, or inclusion in CISA KEV.
Researcher notes
The public detail is sparse: affected scope is stated broadly as vivo Wi-Fi versions earlier than Android 10, with no models, patch identifiers, or proof-of-concept details. Avoid assuming broader Android or non-vivo impact.
Mitigation direction
- Identify vivo devices running Android versions earlier than Android 10.
- Move affected devices to Android 10 or later where vendor-supported.
- Check vivo's advisory for model-specific guidance and available updates.
- Retire or restrict unsupported affected devices from sensitive environments.
- Monitor vendor security advisories for additional remediation details.
Validation and detection
- Inventory managed and unmanaged vivo Android devices.
- Confirm each device Android version and security update status.
- Compare device models against vivo's security advisory.
- Review EMM or MDM records for outdated vivo devices.
- Document unsupported devices requiring replacement or compensating controls.
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-306: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. 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-2021-26278 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
- 6.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/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:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N1.84Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.3MediumVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.vivo.com/en/support/security-advisory-detail?id=7CVE reference
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.
Missing Authentication for Critical Function
Missing Authentication for Critical Function represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.