LiveActive security incident?Get immediate response
CVE Record

CVE-2021-25391: Intent redirection vulnerability in Secure Folder prior to SMR MAY-2021 Release 1 allows attackers to execu...

Intent redirection vulnerability in Secure Folder prior to SMR MAY-2021 Release 1 allows attackers to execute privileged action.

MediumCVSS 4Not KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-25391 is a Samsung Secure Folder intent redirection flaw. On affected Samsung Android 11 devices, an attacker could cause Secure Folder to perform a privileged action. Samsung fixed it in SMR MAY-2021 Release 1. The main business concern is older or unmanaged Samsung devices missing that update.

Executive priority

Treat as moderate priority for mobile fleet hygiene. This is not sourced as actively exploited, but unpatched Secure Folder devices can expose privileged-device behavior and should be updated or removed from trusted use.

Technical view

The CVE describes CWE-926 intent redirection in Samsung Secure Folder before SMR MAY-2021 Release 1, affecting Samsung Mobile Devices running R(11.0). CVSS 3.1 is 4.0 with local attack vector, low complexity, no privileges, and no user interaction, with limited confidentiality impact.

Likely exposure

Exposure is limited to Samsung Mobile Devices on Android R(11.0) with Secure Folder versions before SMR MAY-2021 Release 1. Fully updated devices at or beyond the May 2021 Samsung security release should be out of scope based on the bundle.

Exploitation context

The source bundle does not show CISA KEV listing or confirmed active exploitation. The vulnerability is local, not network-reachable, but requires no privileges or user interaction according to CVSS. Public references include Samsung’s May 2021 advisory and Oversecured research context.

Researcher notes

Evidence is sparse in the bundle. Avoid assuming broader Samsung versions beyond R(11.0). Focus validation on patch level and affected Secure Folder presence. The CVE states privileged action execution, while the CVSS impact records only low confidentiality impact.

Mitigation direction

  • Update affected Samsung devices to SMR MAY-2021 Release 1 or later.
  • Prioritize managed Android 11 Samsung devices using Secure Folder.
  • Check Samsung guidance for any model-specific update availability.
  • Retire or restrict devices that cannot receive the May 2021 security release.

Validation and detection

  • Inventory Samsung Android 11 devices in the managed fleet.
  • Verify each device security patch level is May 2021 or later.
  • Confirm Secure Folder is present on any older Samsung devices.
  • Review MDM compliance data for devices missing Samsung security updates.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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 · low confidence lookup

CWE-926: 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 lookup
cve · low confidence lookup

CVE-2021-25391 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Medium
CVSS
4 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
4CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N2.51.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

4Medium
CVSS 3.1 vector shape for CVE-2021-25391Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Samsung MobileSamsung Mobile DevicesR(11.0)Listed
Weakness

CWE details

CWE-926

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-926 · source CWE mapping

Improper Export of Android Application Components

Improper Export of Android Application Components represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs