Security readout for executives and security teams
Plain-English summary
This Samsung Mobile flaw lets information meant to stay inside the kernel become visible to userspace through insufficient access control on the sec_log file. The direct impact is sensitive information disclosure, not system takeover. Business urgency is elevated because CISA lists CVE-2021-25369 in KEV, meaning known exploitation is documented.
Executive priority
Treat this as a high-priority mobile fleet cleanup item because KEV status changes the risk profile despite a medium CVSS score. Focus on patch compliance and retiring legacy Samsung devices that cannot be updated.
Technical view
CVE-2021-25369 is CWE-200 improper exposure of sensitive information in Samsung Mobile Devices running O(8.x), P(9.0), and Q(10.0) before SMR MAR-2021 Release 1. CVSS 3.1 is 6.2: local attack vector, low complexity, no privileges, no user interaction, high confidentiality impact, no integrity or availability impact.
Likely exposure
Exposure is most likely on corporate-managed or BYOD Samsung Android devices on O(8.x), P(9.0), or Q(10.0) that have not received SMR MAR-2021 Release 1 or later. Unsupported legacy devices are the highest concern.
Exploitation context
CISA KEV status supports known exploitation. The provided sources do not identify exploit campaigns, affected device models, attacker tooling, or indicators. The CVSS vector indicates local exploitation with no required privileges or user interaction.
Researcher notes
The source bundle is sparse: it names sec_log access control, kernel information exposure, affected Android generations, CVSS, and Samsung’s March 2021 security maintenance release. It does not provide exploit mechanics, affected model granularity, forensic indicators, or detailed mitigations beyond vendor update guidance.
Mitigation direction
- Apply Samsung SMR MAR-2021 Release 1 or later where available.
- Prioritize corporate and privileged-user Samsung devices for update verification.
- Remove or replace unsupported affected devices that cannot receive the Samsung fix.
- Use MDM policy to block outdated Android security patch levels.
- Check Samsung advisories for device-specific update availability.
Validation and detection
- Inventory Samsung devices by OS version and Android security patch level.
- Confirm affected devices are not on O(8.x), P(9.0), or Q(10.0) before SMR MAR-2021 Release 1.
- Review MDM compliance reports for stale or unsupported Samsung devices.
- Verify security update status against Samsung Mobile guidance.
- Document exceptions where devices cannot be patched and require replacement.
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-200: 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 lookupCVE-2021-25369 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
- Yes
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/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.
CISA KEV status
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:N/S:U/C:H/I:N/A:N2.53.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.2MediumVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://security.samsungmobile.com/securityUpdate.smsbCVE reference · x_refsource_CONFIRM
- https://security.samsungmobile.com/CVE reference · x_refsource_MISC
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-25369CVE reference · government-resource
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 Sensitive Information to an Unauthorized Actor
Exposure of Sensitive Information to an Unauthorized Actor represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.