Security readout for executives and security teams
Plain-English summary
Samsung Notes had an information exposure issue before version 4.2.04.27. The disclosed impact is access to S Pen latency information, not full notes content. The public bundle does not include CVSS, exploitation evidence, or detailed attack prerequisites, so business risk should be treated as bounded but not fully characterized.
Executive priority
Treat this as a low-urgency hygiene item unless Samsung fleet exposure is broad or update compliance is weak. The available evidence points to limited information exposure, but the missing CVSS and attack prerequisites prevent a stronger risk conclusion.
Technical view
CVE-2021-25402 is a CWE-922 information exposure vulnerability in Samsung Notes prior to 4.2.04.27. Samsung’s disclosure states an attacker could access S Pen latency information. The source bundle does not describe attack vector, required privileges, user interaction, confidentiality scope beyond latency data, or remediation mechanics beyond the fixed version boundary.
Likely exposure
Exposure is likely limited to Samsung devices with Samsung Notes installed below version 4.2.04.27. Organizations with managed Samsung fleets, stylus-heavy workflows, or BYOD devices should verify app versions through MDM or device inventory.
Exploitation context
The provided sources do not report active exploitation, and the CVE is not listed as KEV. No public exploit status, attack path, or weaponization details are included in the bundle.
Researcher notes
Key gaps are attack vector, privilege requirements, and whether exposed latency data has secondary privacy or side-channel value. Avoid assuming broader note-data exposure; the cited description only names S Pen latency information.
Mitigation direction
- Update Samsung Notes to version 4.2.04.27 or later.
- Use MDM controls to push or require the current Samsung Notes version.
- Check Samsung’s advisory for any device-specific guidance.
- Prioritize managed Samsung devices used with S Pen workflows.
Validation and detection
- Inventory Samsung Notes versions across managed Samsung devices.
- Confirm no devices remain below version 4.2.04.27.
- Review MDM compliance reports for update failures.
- Track Samsung advisory updates for revised severity or guidance.
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
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CWE-922: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-25402 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://security.samsungmobile.com/serviceWeb.smsb?year=2021&month=5CVE 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.
Insecure Storage of Sensitive Information
Insecure Storage of Sensitive Information represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.