CVE-2021-25479
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA possible heap-based buffer overflow vulnerability in Exynos CP Chipset prior to SMR Oct-2021 Release 1 allows arbitrary memory write and code execution.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceA heap-based buffer overflow vulnerability in the Exynos CP (Communication Processor) Chipset allows an attacker to write to arbitrary memory locations and potentially achieve code execution. This exists in firmware versions prior to the SMR Oct-2021 Release 1 patch.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 8.1= 9.0= 10.0= 11.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check Android versionGo to Settings > About Phone > Android version, or run: adb shell getprop ro.build.version.releaseAffected if The version is 8.1, 9.0, 10.0, or 11.0 (these are the affected versions)
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Confirm Exynos chipset usageRun: adb shell getprop ro.hardware or check /proc/cpuinfo for Exynos-related processor infoAffected if The hardware is identified as an Exynos chipset (exact model varies, but presence of Exynos in hardware identifier indicates potential exposure)
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Check security patch levelGo to Settings > About Phone > Security patch level, or run: adb shell getprop ro.build.version.security_patchAffected if The patch level is earlier than October 2021 (format typically shows as YYYY-MM-DD)
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Verify CP firmware version (optional deeper check)Check via: adb shell cat /proc/CP_DUMP_VERSION or consult vendor documentation for CP firmware version retrieval methodAffected if CP firmware version is not available or shows as pre-October 2021 build
A device is likely affected if it runs Android 8.1-11.0 on an Exynos chipset with a security patch level before October 2021.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scopedApply the Samsung security patch (SMR Oct-2021 Release 1 or later) which contains the fix for this vulnerability. For embedded systems or devices using this chipset, ensure firmware is updated through the vendor's update mechanism.
SMR Oct-2021 Release 1 or later (Android Security Patch Level October 2021)
- 1. Navigate to Settings on the Samsung device
- 2. Go to Settings > Security (or Settings > Biometrics and security on some devices)
- 3. Tap on Security patch level or check for software updates
- 4. Ensure the device is updated to SMR (Samsung Maintenance Release) October-2021 or later
- 5. If no update is available, check with the device carrier or Samsung for update availability
- 6. Verify the Security patch level shows October 2021 or later after update
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation8.0 h
- Implementation16.0 h
- Testing24.0 h
- Review / QA8.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $15,232.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-25479 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-25479 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data