CVE-2021-32581
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 · uneditedAcronis True Image prior to 2021 Update 4 for Windows, Acronis True Image prior to 2021 Update 5 for Mac, Acronis Agent prior to build 26653, Acronis Cyber Protect prior to build 27009 did not implement SSL certificate validation.
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 confidenceAcronis True Image, Acronis Agent, and Acronis Cyber Protect fail to validate SSL certificates when establishing secure connections. This allows man-in-the-middle attackers to intercept, modify, or spoof communications by impersonating legitimate servers, potentially leading to credential theft, data tampering, or malware injection during backup or protection operations.
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< 15.0.27009< 15.0.26653= 2021CVSS 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
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/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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Identify installed Acronis productCheck installed programs on Windows (Add/Remove Programs, Programs and Features) or Mac (Applications folder, System Preferences > Users & Groups > Login Items) for Acronis True Image, Acronis Cyber Protect, or Acronis AgentAffected if Any Acronis product from the affected list is installed
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Determine Acronis True Image version (Windows)Open Acronis True Image, go to Help > About, or right-click the desktop icon and select Properties > Details to view the version numberAffected if Version shows 2021 without Update 4 (Windows) or Update 5 (Mac) applied
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Determine Acronis Cyber Protect versionOpen Acronis Cyber Protect console, navigate to Help > About, or check the installed program version in Add/Remove ProgramsAffected if Build number is below 27009
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Determine Acronis Cyber Protection Agent versionCheck the Agent version in the Acronis management console, or run 'agent_version' command if available via Acronis command-line toolAffected if Build number is below 26653
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Verify network connectivity configurationCheck if the Acronis product is configured to connect to remote backup locations, cloud storage, or management servers - examine backup job settings or connection profilesAffected if Product is configured for network-based operations (cloud backup, remote management) where SSL validation would be expected but is missing
You are affected if any Acronis True Image 2021, Cyber Protect Cloud before build 27009, or Cyber Protection Agent before build 26653 is installed and configured for network communications.
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 data15.0.2665315.0.27009
Update affected products to the specified versions: Acronis True Image 2021 Update 4 or later for Windows, 2021 Update 5 or later for Mac, Acronis Agent build 26653 or later, or Acronis Cyber Protect build 27009 or later.
- Consultation1.0 h
- Implementation1.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,376.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-32581 — 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-2021-32581 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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