CVE-2023-30939
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 telephony service, there is a missing permission check. This could lead to local information disclosure with no additional execution privileges needed.
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 · low confidenceThis is a missing permission check vulnerability in the Android telephony service. An attacker with local access to the device can potentially access sensitive telephony information without requiring any special privileges, due to an unprotected code path in the telephony service that should enforce permission validation.
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 data= 10.0= 11.0= 12.0= 13.0CVSS 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
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
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.
-
Check Android versionRun 'adb shell getprop ro.build.version.release' or go to Settings > About Phone > Android versionAffected if The version returned is 10.0, 11.0, 12.0, or 13.0 exactly
-
Verify Android security patch levelRun 'adb shell getprop ro.build.version.security_patch' or go to Settings > About Phone > Android security patch levelAffected if The security patch level is earlier than the vendor fix for CVE-2023-30939 (check vendor documentation for the specific patch date)
-
Confirm telephony service accessibilityUse an app or ADB command to query telephony information such as 'adb shell service call telephony 1' to test if unprotected telephony queries succeed without permission challengesAffected if Telephony queries return sensitive data without triggering permission denial or without the calling app holding READ_PHONE_STATE permission
The device is affected if it runs Android 10.0, 11.0, 12.0, or 13.0 and the vendor security patch for CVE-2023-30939 has not been applied, allowing local access to telephony data without permission validation.
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-provided security patch for CVE-2023-30939 which adds the missing permission check in the telephony service. Until the patch is applied, limit physical access to the device and monitor for unusual telephony data access.
- Consultation1.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,480.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-30939 — 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-2023-30939 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
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
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