Security readout for executives and security teams
Plain-English summary
Samsung disclosed a memory corruption issue in the NPU driver on certain Exynos-based mobile devices. If exploited, it could allow memory writes and code execution. The public sources do not provide CVSS, attack prerequisites, or evidence of active exploitation.
Executive priority
Prioritize remediation where affected Samsung devices access corporate data, because the stated impact includes code execution. Business urgency depends on fleet presence and patch status, not confirmed exploitation.
Technical view
CVE-2021-25408 is described as a possible buffer overflow in the Samsung NPU driver before SMR JUN-2021 Release 1. The assigned weakness is CWE-787, out-of-bounds write. Affected devices are Android 9, 10, and 11 models using Exynos 9820, 9830, 980, or 2100 chipsets.
Likely exposure
Exposure is limited to Samsung Mobile devices on Android P, Q, or R with listed Exynos chipsets that have not received SMR JUN-2021 Release 1 or later.
Exploitation context
The provided sources do not state active exploitation, public exploit availability, remote reachability, or required privileges. KEV status is false in the bundle, so treat exploitation as unconfirmed.
Researcher notes
Public detail is sparse. The key facts are affected Exynos chipsets, Android P/Q/R scope, NPU driver buffer overflow, CWE-787, and Samsung’s June 2021 SMR reference. No exploit vector or proof-of-concept is cited.
Mitigation direction
- Apply Samsung SMR JUN-2021 Release 1 or later to affected devices.
- Check Samsung security guidance for model-specific update availability.
- Prioritize managed devices with listed Exynos chipsets and outdated patch levels.
- Retire or isolate devices that cannot receive the relevant Samsung security update.
Validation and detection
- Inventory Samsung devices by model, Android version, chipset, and security patch level.
- Confirm affected devices show June 2021 SMR Release 1 or newer.
- Use MDM reporting to identify devices below the required patch level.
- Verify unsupported or unmanaged devices are removed from sensitive access paths.
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-787: 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-25408 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/securityUpdate.smsb?year=2021&month=6CVE 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 Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.