CVE-2011-5237
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 · uneditedPayPal WPS ToolKit does not verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid 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 PayPal WPS ToolKit establishes SSL/TLS connections but fails to verify that the server's certificate hostname matches the expected domain name. This is a classic certificate hostname validation bypass - the tool accepts any valid SSL certificate regardless of whether it was issued for the intended server, enabling man-in-the-middle attacks.
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
- M
- Authentication
- None
- Confidentiality
- Partial
- Integrity
- Partial
- Availability
- None
AV:N/AC:M/Au:N/C:P/I:P/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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Identify PayPal WPS Toolkit presenceSearch for files or libraries named 'PayPal', 'WPS', 'wps', or 'paypal' in your project dependencies, installed packages, or application binariesAffected if The PayPal WPS Toolkit library is found in the environment
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Locate SSL connection codeSearch source code for SSL/TLS connection implementations, look for imports of PayPal security classes such as PayPalHttpClient, SSL, or HTTPS connection handlersAffected if Code uses the toolkit to establish SSL/HTTPS connections
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Inspect hostname verification implementationSearch for HostnameVerifier or certificate validation code paths, examine whether the code calls any hostname verification method before establishing SSL connectionsAffected if No hostname verification is performed or a permissive HostnameVerifier (that accepts all hosts) is configured
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Check custom TrustManager usageSearch for custom TrustManager or X509TrustManager implementations in the codebase, particularly those that may be used with the PayPal toolkitAffected if A custom TrustManager that skips certificate hostname validation is in use
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Review SSL socket factory configurationExamine SSLContext or SSLSocketFactory initialization for the PayPal connection code, check if verifyHostname or similar validation flags are disabledAffected if Hostname verification is explicitly disabled or bypassed in SSL configuration
Your environment is affected if the PayPal WPS Toolkit is present and your code establishes SSL connections through it without performing certificate hostname validation against the expected server domain.
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 dataImplement proper hostname verification by checking that the certificate's Common Name (CN) or subjectAltName matches the expected server hostname before trusting the SSL connection.
- 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.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2011-5237 — 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-2011-5237 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
- No spam, self-promotion, credentials, or personal data