CVE-2025-20755
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 application crash due to improper input validation. 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: MOLY00628396; Issue ID: MSV-4775.
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 denial of service vulnerability exists in cellular modem firmware where improper input validation allows a remote attacker to crash the modem by transmitting specially crafted signals from a rogue base station. When a User Equipment connects to the attacker's malicious cell tower, malformed network messages trigger an application crash in the modem component, causing a denial of service condition.
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
- Network
- Complexity
- High
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:H/PR:L/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 is presentIdentify if the device or system contains a Mediatek Nr15 cellular modem component. This may be documented in device specifications, system inventory, or modem diagnostic outputs (e.g., AT+CGMM or AT+CGMI commands).Affected if The device does not contain a Mediatek Nr15 modem - this CVE does not apply.
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Check installed modem firmware versionRetrieve the current modem firmware version using vendor-specific diagnostic commands (such as AT+CGMR, AT+CVERSION, or through manufacturer utility tools). Compare the version string against the patch level MOLY00628396.Affected if The firmware version is below MOLY00628396 or cannot be verified, indicating the vulnerability is present.
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Verify cellular network connectivity is enabledConfirm that the modem's radio and network registration functions are active. Check modem status via AT+CREG?, AT+CGREG?, or similar network registration queries, or review system network configuration.Affected if Cellular connectivity is enabled and the modem can register on networks - the attack surface exists.
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Assess exposure to untrusted base stationsReview whether the device configuration permits connection to any available cellular network, or if it is restricted to trusted operators via SIM lock, preferred network lists, or operator policies.Affected if The device can connect to untrusted or unknown cellular base stations (rogue cell towers), exposing it to the attack vector.
A device is affected if it contains a Mediatek Nr15 modem with firmware version below MOLY00628396 and has cellular network connectivity enabled that allows connection to untrusted base stations.
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 the vendor patch (MOLY00628396) to the modem firmware. Until the patch is deployed, advise users to avoid connecting to untrusted or unknown cellular base stations to reduce exposure to this attack vector.
- Consultation4.0 h
- Implementation8.0 h
- Testing12.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-20755 — 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-2025-20755 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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