CVE-2023-43760
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 · uneditedCertain WithSecure products allow Denial of Service via a fuzzed PE32 file. This affects WithSecure Client Security 15, WithSecure Server Security 15, WithSecure Email and Server Security 15, WithSecure Elements Endpoint Protection 17 and later, WithSecure Client Security for Mac 15, WithSecure Elements Endpoint Protection for Mac 17 and later, Linux Security 64 12.0 , Linux Protection 12.0, and WithSecure Atlant (formerly F-Secure Atlant) 1.0.35-1.
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 confidenceA denial of service vulnerability exists in multiple WithSecure security products (Client Security, Server Security, Email and Server Security, Elements Endpoint Protection, Linux Security, and Atlant) that can be triggered by processing a fuzzed/malformed PE32 executable file. The vulnerability allows an attacker to cause the affected security product to crash or become unresponsive.
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= 15.00>= 17.0= 15.00= 15.00= 12.0= 12.0= 1.0.35-1CVSS 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
- 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 installed WithSecure security productCheck installed programs or running services for F-Secure or WithSecure security products (Client Security, Server Security, Email and Server Security, Elements Endpoint Protection, Linux Security, or Atlant). Use system inventory or package management tools appropriate to the OS.Affected if Any of the named WithSecure products are installed
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Determine product versionUse the product's built-in version information command, about dialog, or system information tool to obtain the exact installed version number.Affected if Version matches: 15.00 (Client Security, Email And Server Security, Server Security), 12.0 (Linux Protection, Linux Security 64), >= 17.0 (Elements Endpoint Protection), or 1.0.35-1 (Atlant)
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Verify real-time or on-demand file scanning is enabledCheck the product configuration or policy settings to confirm that file scanning (real-time protection, on-access scanning, or on-demand scanning) is active. The vulnerability triggers when the product processes a malformed PE32 file.Affected if File scanning functionality is enabled and the product version is in the affected list
A user is affected if they have any of the named WithSecure products installed with a version matching the affected ranges and have file scanning enabled, as the DoS triggers when the product processes a malformed PE32 executable.
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 dataApply available vendor patches or updates from WithSecure to the affected products. Until patches are available, consider restricting or monitoring the processing of untrusted PE32 files in environments running these security products.
- Consultation3.0 h
- Implementation6.0 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 $4,224.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-43760 — 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-2023-43760 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