CVE-2017-7468
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 curl and libcurl 7.52.0 to and including 7.53.1, libcurl would attempt to resume a TLS session even if the client certificate had changed. That is unacceptable since a server by specification is allowed to skip the client certificate check on resume, and may instead use the old identity which was established by the previous certificate (or no certificate). libcurl supports by default the use of TLS session id/ticket to resume previous TLS sessions to speed up subsequent TLS handshakes. They are used when for any reason an existing TLS connection couldn't be kept alive to make the next handshake faster. This flaw is a regression and identical to CVE-2016-5419 reported on August 3rd 2016, but affecting a different version range.
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 confidencelibcurl 7.52.0-7.53.1 attempts to resume TLS sessions regardless of whether the client certificate has changed, allowing servers to accept stale or missing credentials from a previous session instead of validating the current certificate.
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>= 7.52.0, <= 7.53.1CVSS 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
- None
- Integrity
- High
- Availability
- None
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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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Check installed libcurl versionRun `curl --version` or check the libcurl library file version using `ldd --version` or inspect the shared library file in /usr/lib/ or /usr/lib64/Affected if The version displayed is greater than or equal to 7.52.0 and less than or equal to 7.53.1
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Verify TLS client certificate authentication is in useReview the application or service configuration that uses libcurl to determine if CURLOPT_SSLCERT or similar client certificate options are configured, or inspect network traffic to see if client certificates are being presented during TLS handshakeAffected if Client certificate authentication is configured and the client presents a certificate to the server during TLS negotiation
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Confirm TLS session ticket resumption is enabledCheck if the application explicitly disables session ticket resumption via CURLOPT_SSL_SESSIONID_CACHE or the CURLSSLOPT_NO_SESSION_PURGE option, or examine if libcurl is built with default session caching enabledAffected if Session ticket resumption is enabled (default behavior) and the client attempts to resume a session with a changed certificate
You are affected if your installed libcurl version is between 7.52.0 and 7.53.1, you use TLS client certificate authentication, and session ticket resumption is enabled, allowing potentially stale credentials to be accepted by servers.
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 dataUpgrade libcurl to version 7.54.0 or later, or disable TLS session ticket resumption if immediate patching is not feasible.
- Consultation4.0 h
- Implementation8.0 h
- Testing12.0 h
- Review / QA4.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2017-7468 — 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-2017-7468 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
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