CVE-2024-23775
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 · uneditedInteger Overflow vulnerability in Mbed TLS 2.x before 2.28.7 and 3.x before 3.5.2, allows attackers to cause a denial of service (DoS) via mbedtls_x509_set_extension().
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 confidenceInteger overflow vulnerability in mbedtls_x509_set_extension() function in Mbed TLS versions prior to 2.28.7 (2.x) and 3.5.2 (3.x). The flaw allows attackers to trigger a denial of service through improper integer handling when processing X.509 certificate extensions.
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>= 2.0.0, < 2.28.7>= 3.0.0, < 3.5.2CVSS 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
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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 the Mbed TLS library in useLocate the Mbed TLS library file or package installed in the system. This may be a shared library file (such as libmbedtls.so on Linux or mbedtls.dll on Windows), or a package managed by the system's package manager.Affected if The library cannot be found or is not Mbed TLS
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Determine the installed Mbed TLS versionUse the system's package manager, library versioning tools, or any version reporting mechanism provided by the application using Mbed TLS to retrieve the exact version number.Affected if The version is less than 2.28.7 for 2.x branches, or less than 3.5.2 for 3.x branches
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Confirm the application uses X.509 certificate handlingInspect the application code or configuration to determine if Mbed TLS X.509 functionality is being used, particularly functions that process certificate extensions.Affected if X.509 certificate extension processing is performed using the affected code path
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Check if certificate extensions are processed from untrusted sourcesReview whether the application processes X.509 certificates from external or untrusted sources, as the integer overflow occurs when setting certificate extensions.Affected if The application processes certificate extensions from external or untrusted sources without additional validation
You are affected if your Mbed TLS version is below 2.28.7 (for 2.x) or below 3.5.2 (for 3.x) AND your application processes X.509 certificate extensions from external sources.
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.
dbcve · scoped2.28.73.5.2
Upgrade Mbed TLS library to version 2.28.7 or later for 2.x branches, or version 3.5.2 or later for 3.x branches.
Mbed TLS 2.28.7 (for 2.x line) or Mbed TLS 3.5.2 (for 3.x line)
- Identify current Mbed TLS version by checking library headers or build configuration
- For Mbed TLS 2.x line: upgrade to version 2.28.7
- For Mbed TLS 3.x line: upgrade to version 3.5.2
- Verify the installed version matches the target fixed release using mbedtls_version_get_number() or equivalent
- Test that certificate handling functionality using mbedtls_x509_set_extension() continues to work correctly
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation1.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-23775 — 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-2024-23775 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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