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AntivirusApplication · Avast

CVE-2017-8307

CRITICAL · 9.8 CVSS v3.0 Published 2017-04-27
Fix available
A fix is available. Upgrade to after 12.3.2279 or later.
See remediation →
100/100
Remediation priority · Urgent
Public exploit Remotely reachable No privileges 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
In Avast Antivirus before v17, using the LPC interface API exposed by the AvastSVC.exe Windows service, it is possible to launch predefined binaries, or replace or delete arbitrary files. This vulnerability is exploitable by any unprivileged user when Avast Self-Defense is disabled. It is also exploitable in conjunction with CVE-2017-8308 when Avast Self-Defense is enabled. The vulnerability allows for Denial of Service attacks and hiding traces of a possible attack.

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

A detailed technical summary for this CVE is being prepared.

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
AntivirusApplication
Affected:<= 12.3.2279

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

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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 · scoped
Upgrade available Upgrade to a release after 12.3.2279
Recommended fix Moderate confidence

Avast Antivirus version 17.0 or later (v17 and above)

  1. 1. Open the Avast Antivirus user interface
  2. 2. Navigate to Menu > Settings
  3. 3. Click on 'General' tab and scroll to 'Updates'
  4. 4. Ensure automatic updates are enabled or manually check for updates
  5. 5. If update to version 17+ is available, click 'Update' to install it
  6. 6. Restart the computer if prompted after the update
  7. 7. Verify the installed version by going to Menu > Settings > General > About to confirm version 17.0 or later is installed
  8. 8. Re-enable Avast Self-Defense feature (Menu > Settings > General > Troubleshooting > Enable Self-Defense) if it was previously disabled
Caveat Standard antivirus upgrade - ensure compatibility with other installed security software; backup important data before any major software update as standard practice

Generated from the published advisory — verify against the referenced sources before acting.

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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-2017-8307 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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