CVE-2025-20756
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 · uneditedIn Modem, there is a possible system crash due to a logic error. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01673749; Issue ID: MSV-4643.
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 logic error in the modem component can cause a system crash when user equipment (UE) connects to a rogue/malicious base station controlled by an attacker. This leads to remote denial of service without requiring additional privileges or user interaction.
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 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
- Adjacent
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/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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Confirm Mediatek Nr15 modem presenceQuery the modem for its model identification using AT commands (AT+CGMM or AT+GMM) through a serial terminal or manufacturer diagnostic tool. Alternatively, check system information in Settings > About Phone > SIM Status on Android, or review kernel boot logs for 'Nr15' or 'Mediatek' modem references.Affected if The modem identifies as Mediatek Nr15 or Mediatek modem model falls within Nr15 product line
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Retrieve modem firmware versionUse AT command AT+CGMR or AT+GMR to read the installed modem firmware version. On some devices, this information is also visible in Settings > About Phone > SIM Status or through carrier-specific diagnostic menus.Affected if The firmware version returned corresponds to Mediatek Nr15 product line (all versions are affected)
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Assess cellular network exposureMonitor cell tower connection logs or use mobile network monitoring applications to observe which base stations the device connects to. Check if automatic network selection is enabled, which could cause connection to untrusted base stations.Affected if The device connects to or can connect to cellular networks, enabling potential exploitation via rogue base stations
If the device contains a Mediatek Nr15 modem component and operates on cellular networks, it is affected by this vulnerability since all versions contain the logic error that can be triggered by connecting to a malicious base station.
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 dataAvoid connecting to untrusted or unknown base stations; apply vendor-supplied firmware patches (Patch ID MOLY01673749) to affected devices once available through official update channels.
- Consultation3.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-20756 — 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-2025-20756 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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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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