CVE-2014-5821
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 · uneditedThe Guitar Tuner Free - GuitarTuna (aka com.ovelin.guitartuna) application 2.4.5 for Android does not verify X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.
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 confidenceThe GuitarTuna Android application version 2.4.5 fails to validate X.509 certificates from SSL servers during HTTPS connections. This improper certificate validation allows an attacker positioned on the same network to intercept traffic by presenting a fraudulent certificate, enabling man-in-the-middle attacks and potential theft of sensitive user data.
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= 2.4.5CVSS 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
- M
- Authentication
- None
- Confidentiality
- Partial
- Integrity
- Partial
- Availability
- Partial
AV:A/AC:M/Au:N/C:P/I:P/A:P
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 the installed GuitarTuna versionUse 'adb shell dumpsys package com.guitartuna.app' or check the app info in device settings to confirm the exact version number installedAffected if The installed version is exactly 2.4.5 (Guitartuna Guitar Tuner Free)
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Confirm the app has network access permissionsInspect the AndroidManifest.xml for INTERNET permission, or use 'adb shell dumpsys package com.guitartuna.app' to list granted permissionsAffected if The app has INTERNET permission granted, enabling it to make network connections
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Test for SSL certificate validation failurePerform a man-in-the-middle test using a proxy (such as Burp Suite or OWASP ZAP) with an untrusted certificate. Configure the device to trust your proxy certificate, then monitor if the app successfully establishes HTTPS connections through the proxyAffected if The app successfully connects and transmits data despite the proxy presenting an untrusted/self-signed certificate, indicating certificate validation is bypassed
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Inspect network traffic for unencrypted fallbackUse a network sniffing tool (such as Wireshark or tcpdump) to capture traffic while the app is in use, looking for any HTTP (non-HTTPS) connections or unexpected protocolsAffected if The app transmits sensitive data over unencrypted HTTP or accepts invalid certificates without rejection
You are affected if GuitarTuna version 2.4.5 is installed and the app accepts HTTPS connections without properly validating the server's X.509 certificate chain against trusted root CAs.
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 dataThe application should implement proper SSL/TLS certificate validation, preferably through certificate pinning or by ensuring the app correctly validates the full certificate chain against a trusted root CA. All network communications should be performed over properly validated SSL/TLS connections.
- 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.
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Free · runs locallyCheck whether your project pulls in CVE-2014-5821 — 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-2014-5821 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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