dbcve.org
Avg AntivirusApplication · Grisoft

CVE-2008-3373

MEDIUM · 5.0 CVSS v2.0 Published 2008-07-30
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
59/100
Remediation priority · Elevated
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
The files parsing engine in Grisoft AVG Anti-Virus before 8.0.156 allows remote attackers to cause a denial of service (engine crash) via a crafted UPX compressed file, which triggers a divide-by-zero error.

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 divide-by-zero vulnerability exists in Grisoft AVG Anti-Virus's files parsing engine versions prior to 8.0.156. Remote attackers can trigger this denial of service by providing a crafted UPX compressed file that causes the parsing engine to crash.

MitigationUpgrade to AVG Anti-Virus version 8.0.156 or later. Until the upgrade is applied, exercise caution with UPX compressed files from untrusted sources.

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
Avg AntivirusApplication
Affected:= 7.1= 7.5= 8.0

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
Network
Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial

AV:N/AC:L/Au:N/C:N/I:N/A:P

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 installed AVG Anti-Virus version
    Open AVG interface, go to 'About' or 'Help' > 'About', or run 'avgcc --version' from command line. Also check Windows Add/Remove Programs or the executable version info (right-click avg.exe > Properties > Version).
    Affected if The displayed version is 7.1, 7.5, or 8.0 (any subversion below 8.0.156)
  2. Confirm file scanning is enabled
    In AVG settings, verify that 'Resident Shield' or 'File System Shield' is enabled and scanning is active. Check if 'Scan compressed files' option is turned on.
    Affected if Resident/file scanning is enabled and set to scan compressed files including UPX
  3. Verify UPX file handling is active
    Check AVG's advanced settings or file types being scanned. Look for UPX in the list of supported compressed formats or ensure 'Scan all file types' is selected.
    Affected if UPX compressed files are being scanned by the resident shield

You are affected if AVG version is 7.1, 7.5, or any 8.0 version prior to 8.0.156, and file scanning with UPX support is enabled.

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
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade to AVG Anti-Virus version 8.0.156 or later. Until the upgrade is applied, exercise caution with UPX compressed files from untrusted sources.

Fix this in Avg Antivirus Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA1.0 h
9.0 hours of engineering $1,600
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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-2008-3373 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