CVE-2025-20703
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 out of bounds read due to an incorrect bounds check. 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: MOLY01599794; Issue ID: MSV-3708.
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 confidenceOut of bounds read vulnerability in cellular modem firmware due to incorrect bounds checking. Exploitable remotely by a rogue/malicious base station to cause denial of service on connected User Equipment (UE) without requiring user interaction or elevated privileges.
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 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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Identify Mediatek modem model in deviceCheck device hardware specifications, FCC filings, or modem firmware logs for Mediatek chip identifiers. Look for strings containing 'MT' or 'Mediatek' alongside 'Nr15', 'Nr16', 'Nr17', or 'Nr17r' in modem identification output (e.g., AT+CGMM, AT+CGSN, or boot logs).Affected if The device contains a Mediatek Nr15, Nr16, Nr17, or Nr17r cellular modem chipset.
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Locate firmware version stringQuery the modem using AT commands such as AT+CGMR or AT+VER to retrieve firmware version information. Alternatively, inspect system logs or firmware binary metadata if direct modem access is unavailable.Affected if Firmware version is returned and confirms the modem model is one of the affected Nr15/Nr16/Nr17/Nr17r variants (all versions of these products are affected per vendor advisory).
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Verify cellular modem is actively usedConfirm the modem is in an operational state by checking for active cellular network registration (AT+CREG?, AT+CGREG?) or by observing data connection status. This confirms the vulnerable code path is present in the running configuration.Affected if The modem is registered on a cellular network, indicating the firmware component with the vulnerability is active and could be exploited by a nearby malicious base station.
A device is affected if it incorporates any Mediatek Nr15, Nr16, Nr17, or Nr17r cellular modem firmware and has an active cellular connection, since all versions of these products contain the out-of-bounds read 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 vendor firmware patch MOLY01599794 when available; until then, advise users to avoid connecting UE devices to untrusted or unknown cellular base stations.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,120.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-20703 — 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-2025-20703 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
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