CVE-2026-20422
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 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: MOLY00827332; Issue ID: MSV-5919.
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 remote denial of service vulnerability exists in the modem component due to improper input validation. When a User Equipment (UE) connects to a rogue base station controlled by an attacker, specially crafted messages can trigger a system crash in the modem. No user interaction or elevated privileges are required for 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 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 the modem chipset modelQuery the device's modem information using standard AT commands (e.g., AT+CGMM, AT+CGMI) or through system information interfaces provided by the device manufacturerAffected if The modem model number matches Mediatek Nr15, Nr16, Nr17, or Nr17r
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Verify the firmware versionQuery the modem firmware version using AT commands (e.g., AT+CGMR) or through the device's system update/about settingsAffected if The firmware version is present and the modem is one of the affected models - all versions of these models are vulnerable
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Check for modem crash logsReview system logs, modem diagnostics, or crash dump files for evidence of unexpected modem restarts or crashes, particularly those occurring without user-initiated actionsAffected if Unexpected modem crashes or resets are logged, especially in environments where the device may connect to untrusted cellular networks
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Assess network exposureDetermine whether the device regularly connects to cellular networks beyond operator-controlled infrastructure, or can be placed in monitoring mode to detect anomalous base station behaviorAffected if The device operates in an environment where connection to rogue base stations is possible or has been detected
If the device contains a Mediatek Nr15, Nr16, Nr17, or Nr17r modem chipset, it is affected by this vulnerability regardless of firmware version, as all versions are impacted.
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 patch MOLY00827332 to the modem firmware. Users cannot practically avoid connecting to rogue base stations, so patching is the primary mitigation. Network operators should monitor for anomalous base station activity.
- 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-2026-20422 — 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-2026-20422 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
- No weaponised exploit code, or anything meant to cause harm
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