CVE-2025-27891
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 · uneditedAn issue was discovered in Samsung Mobile Processor, Wearable Processor, and Modem Exynos 980, 990, 850, 1080, 2100, 1280, 2200, 1330, 1380, 1480, 2400, W920, W930, W1000, Modem 5123, Modem 5300, Modem 5400. The lack of a length check leads to out-of-bounds reads via malformed NAS packets.
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 · high confidenceA missing length check in the NAS (Non-Access Stratum) protocol handling of Samsung Exynos mobile and wearable processors and modems allows out-of-bounds memory reads when processing malformed NAS packets. This memory safety vulnerability affects 15 processor variants and 3 modem variants, enabling potential information disclosure or further exploitation.
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 dataall versionsall versionsall versionsall versionsall versionsall versionsall versionsall versionsCVSS 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
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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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Identify the Exynos processor modelOn the target device, check the processor/CPU information via Settings > About Phone > Processor or by examining /proc/cpuinfo for 'Exynos' entries, or use a system information appAffected if The processor model matches one of the affected variants: Exynos 980, 990, 850, 1080, 2100, 1280, 2200, or 1330
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Confirm firmware versionCheck the baseband/modem firmware version via Settings > About Phone > Baseband version, or use *#0011# on the dialer for service mode, or examine /proc/versionAffected if The device runs any firmware version on the affected Exynos processors (all versions listed as affected)
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Verify cellular/mobile connectivity capabilityConfirm the device has cellular modem capability by checking for SIM card slots, mobile network settings, and baseband information presence in system settingsAffected if The device has an active cellular radio and NAS (Non-Access Stratum) protocol stack is present and processing mobile network packets
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Check for vendor security updatesReview Settings > Software Update or Security Patch level in Settings > About Phone to determine the installed Samsung security patch dateAffected if The security patch level predates the vendor release addressing CVE-2025-27891, or the device is no longer receiving updates
A device is affected if it contains any of the following Exynos processors (980, 990, 850, 1080, 2100, 1280, 2200, 1330) with cellular capability and lacks the vendor security update addressing this vulnerability.
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.
From vendor dataApply Samsung firmware/security updates for affected processors and modems once released by the vendor; prioritize mobile devices with direct internet exposure.
- Consultation8.0 h
- Implementation16.0 h
- Testing12.0 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 $12,352.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-27891 — 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-2025-27891 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