CVE-2020-27034
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 createSimSelectNotification of SimSelectNotification.java, there is a possible permission bypass due to an unsafe PendingIntent. This could lead to local information disclosure with User execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-11Android ID: A-153556754
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 confidenceIn createSimSelectNotification of SimSelectNotification.java, an unsafe PendingIntent allows a local attacker to bypass permission checks and access sensitive SIM selection information. The PendingIntent lacks proper immutability flags, enabling a malicious app to potentially intercept or manipulate the intent to disclose information without 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 data= 11.0CVSS 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.
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Verify Android versionCheck system property 'ro.build.version.release' or Settings > About Phone > Android versionAffected if Version is 11.0 (exact match)
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Locate vulnerable source fileFind SimSelectNotification.java in the Android framework telecom module (typically at frameworks/opt/telecom/src/java/com/android/internal/telephony/SimSelectNotification.java)Affected if File exists in the ROM/framework build
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Inspect PendingIntent creation in createSimSelectNotificationSearch the source file for PendingIntent.getBroadcast or PendingIntent.getActivity calls within the createSimSelectNotification methodAffected if PendingIntent is created without FLAG_IMMUTABLE (0 flag or only FLAG_UPDATE_CURRENT)
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Verify immutability flag presenceLook for PendingIntent.FLAG_IMMUTABLE or 0x04000000 in the PendingIntent creation callAffected if FLAG_IMMUTABLE is absent from the PendingIntent flags
A system is affected if it runs Android 11.0 and the SimSelectNotification.java source code contains a PendingIntent creation without FLAG_IMMUTABLE in the createSimSelectNotification method.
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 FLAG_IMMUTABLE when creating PendingIntents in SimSelectNotification.java to prevent intent hijacking. For Android 11 specifically, ensure the notification creation uses the latest secure PendingIntent patterns and validate all intent extras before processing.
- Consultation6.0 h
- Implementation4.0 h
- Testing12.0 h
- Review / QA6.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-27034 — 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-2020-27034 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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