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Advanced Malware Protection For EndpointsApplication · Cisco

CVE-2021-1386

HIGH · 7.8 CVSS v3.1 Published 2021-04-08
Fix available
A fix is available. Upgrade to 0.103.2 / 7.3.15 or later.
See remediation →
80/100
Remediation priority · High
Zero-click

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 · unedited
A vulnerability in the dynamic link library (DLL) loading mechanism in Cisco Advanced Malware Protection (AMP) for Endpoints Windows Connector, ClamAV for Windows, and Immunet could allow an authenticated, local attacker to perform a DLL hijacking attack on an affected Windows system. To exploit this vulnerability, the attacker would need valid credentials on the system. The vulnerability is due to insufficient validation of directory search paths at run time. An attacker could exploit this vulnerability by placing a malicious DLL file on an affected system. A successful exploit could allow the attacker to execute arbitrary code with SYSTEM privileges.

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 confidence

A DLL hijacking vulnerability in Cisco AMP for Endpoints Windows Connector, ClamAV for Windows, and Immunet allows an authenticated local attacker to place a malicious DLL file that gets loaded by the vulnerable application due to insufficient validation of directory search paths at runtime, achieving arbitrary code execution with SYSTEM privileges.

MitigationApply vendor patches from Cisco for the affected products; until patched, restrict local access to trusted personnel only and monitor for suspicious DLL files in application directories.

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
Advanced Malware Protection For EndpointsApplication
Affected:< 7.3.15
ClamavApplication
Affected:< 0.103.2
ImmunetApplication
Affected:< 7.4.0

CVSS 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
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 checks

Work through these to decide whether this CVE applies to you.

  1. Check if Cisco AMP for Endpoints Windows Connector is installed
    Open Windows Registry under HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall or check for presence of folder C:\Program Files\Cisco\AMP (or equivalent). Use command: dir /s /b "C:\Program Files\Cisco\AMP" 2>nul
    Affected if The product is installed AND its version is below 7.3.15
  2. Check if Cisco ClamAV for Windows is installed
    Check for presence of ClamAV installation directory (commonly C:\Program Files\ClamAV or C:\Program Files (x86)\ClamAV). Use command: dir /s /b "C:\Program Files\ClamAV" 2>nul OR dir /s /b "C:\Program Files (x86)\ClamAV" 2>nul
    Affected if The product is installed AND its version is below 0.103.2
  3. Check if Cisco Immunet is installed
    Check for presence of Immunet installation directory (commonly C:\Program Files\Immunet). Use command: dir /s /b "C:\Program Files\Immunet" 2>nul
    Affected if The product is installed AND its version is below 7.4.0
  4. Determine installed version of Cisco AMP
    Check the version of amp.exe or look in Windows Registry under the uninstall key for Cisco AMP, or run: wmic product where "name like 'Cisco AMP%'" get version
    Affected if Version returned is blank, not found, or less than 7.3.15
  5. Determine installed version of ClamAV
    Run clamscan --version or check the version information ofclamd.exe or freshclam.exe in the installation directory
    Affected if Version returned is less than 0.103.2 or command fails to execute
  6. Determine installed version of Immunet
    Check the version of protect.exe in the Immunet installation directory, or look in Windows Registry under the uninstall key for Immunet
    Affected if Version returned is less than 7.4.0 or command fails to execute

A user is affected if any of these three Cisco products (AMP for Endpoints, ClamAV for Windows, or Immunet) is installed with a version below the respective threshold (7.3.15, 0.103.2, or 7.4.0), making them vulnerable to DLL hijacking with SYSTEM privilege escalation.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Upgrade available Upgrade to 0.103.2 / 7.3.15 / 7.4.0 or later
Fixed in 0.103.27.3.157.4.0
Interim mitigation

Apply vendor patches from Cisco for the affected products; until patched, restrict local access to trusted personnel only and monitor for suspicious DLL files in application directories.

Fix this in Advanced Malware Protection For Endpoints Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
Get the upgrade done

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 locally
dbcve dependency scanner

Check whether your project pulls in CVE-2021-1386 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-1386 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • 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