Security readout for executives and security teams
Plain-English summary
This is a critical Samsung mobile vulnerability in a media parsing library. A malformed Sample Rate Chunk could allow arbitrary code execution in the mediaextractor process on affected devices before Samsung’s May 2021 security maintenance release.
Executive priority
Treat as high-priority legacy mobile hygiene. The issue is critical and code-execution capable, but sources only support patch-status urgency, not confirmed active exploitation.
Technical view
CVE-2021-25384 is improper input validation in sdfffd_parse_chunk_PROP() within Samsung’s libsdffextractor library. The record maps it to CWE-122 and gives CVSS 3.1 score 9.0. Affected branches are Samsung Mobile Devices on Android O 8.1, P 9.x, Q 10.0, and R 11.0 before SMR MAY-2021 Release 1.
Likely exposure
Exposure is likely limited to Samsung Mobile Devices on the listed Android versions that have not received SMR MAY-2021 Release 1 or later. The sources do not identify other vendors, server products, or CPEs.
Exploitation context
The source bundle does not show CISA KEV listing or any cited active exploitation. The CVSS vector indicates remote, no-privilege, no-user-interaction potential, but high attack complexity. Public details do not describe exploit mechanics.
Researcher notes
Public evidence is concise. The vulnerable component, function, chunk type, affected Android branches, CVSS vector, CWE, and Samsung fixed release are identified. No proof-of-concept, exploit-in-the-wild claim, or detailed root-cause analysis is present in the provided sources.
Mitigation direction
- Update affected Samsung devices to SMR MAY-2021 Release 1 or later.
- Check Samsung’s May 2021 bulletin for device-specific availability.
- Prioritize unsupported affected devices for replacement or isolation.
- Use MDM reporting to enforce minimum Android security patch levels.
Validation and detection
- Inventory Samsung devices running Android O, P, Q, or R.
- Verify each device has the May 2021 Samsung security release or later.
- Confirm CVE-2021-25384 appears addressed in vendor bulletin mappings.
- Review crash or EDR telemetry involving mediaextractor for unusual patterns.
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-122: 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-2021-25384 mapping review
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Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
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:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H2.26Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9CriticalVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://security.samsungmobile.com/securityUpdate.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.
Heap-based Buffer Overflow
Heap-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.