CVE-2020-11828
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 ColorOS (oppo mobile phone operating system, based on AOSP frameworks/native code position/services/surfaceflinger surfaceflinger.CPP), RGB is defined on the stack but uninitialized, so when the screenShot function to RGB value assignment, will not initialize the value is returned to the attackers, leading to values on the stack information leakage, the vulnerability can be used to bypass attackers ALSR.
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 confidenceAn uninitialized stack variable (RGB) in ColorOS surfaceflinger.cpp is returned during screen capture operations, leaking stack memory contents. This information disclosure enables attackers to potentially defeat ASLR by leaking stack addresses.
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
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/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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Confirm device is Oppo ColorOSCheck device settings: Settings > About Phone > Software Info > ColorOS Version, or check if 'ColorOS' appears in the build number or software versionAffected if Device is not an Oppo device running ColorOS - this vulnerability is specific to ColorOS only
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Verify ColorOS versionNote the ColorOS version number from Settings > About Phone. Compare against any published version lists from Oppo, but note that according to the CVE all ColorOS versions are affectedAffected if Device runs any ColorOS version - per the CVE, all ColorOS versions are affected by this vulnerability
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Confirm screen capture feature is presentAttempt to take a screenshot using the standard method (power + volume down) or check if the screenshot function exists in the notification panelAffected if Screen capture functionality exists - the vulnerability is triggered during screen capture operations when the uninitialized RGB variable is returned
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Check for system updatesGo to Settings > Software Update and check if any updates are available. Note that per the CVE, the fix requires modifying the native surfaceflinger code in ColorOSAffected if No vendor update addressing this specific vulnerability has been applied
A user is affected if they are running any version of ColorOS on an Oppo device and the screen capture feature is present, as the CVE indicates all ColorOS versions contain the uninitialized stack variable in surfaceflinger.cpp.
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 dataInitialize the RGB variable before use in the screenShot function - this requires modifying the native surfaceflinger code in ColorOS. Users should monitor for vendor firmware updates.
- Consultation2.0 h
- Implementation1.0 h
- Testing4.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2020-11828 — 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-2020-11828 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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