CVE intelligence and bounded remediation

CVE-2020-9320 — Avira AV Engine before 8.3.54.138 allows virus-detection bypass via a crafted ISO archive

Medium CVSS 5.5

Avira AV Engine before 8.3.54.138 allows virus-detection bypass via a crafted ISO archive. This affects versions before 8.3.54.138 of Antivirus for Endpoint, Antivirus for Small Business, Exchange Security (Gateway), Internet Security Suite for Windows, Prime, Free Security Suite for Windows, and Cross Platform Anti-malware SDK. NOTE: Vendor asserts that vulnerability does not exist in product

Severity
Medium
CVSS
5.5 (3.1)
Published
2020-02-20
CISA KEV
Not currently listed
Ecosystem
windows/system
Weaknesses
CWE-434

Affected products

  • avira / anti-malware_sdk
  • avira / antivirus_server
  • avira / avira_antivirus_for_endpoint
  • avira / avira_antivirus_for_small_business
  • avira / avira_exchange_security
  • avira / avira_free_security_suite

Showing 6 representative product identities from 8 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Path traversal, unsafe upload, and file handling

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Trace untrusted filenames, archive entries, URLs, and path segments into read, write, include, extraction, and upload operations.
  • Identify filesystem roots, mount permissions, symbolic-link behavior, archive handling, and whether uploaded content is web-accessible or executable.
  • Review canonicalization and containment checks across supported operating systems and storage backends.

Remediate safely

  • Generate server-side storage identifiers and resolve paths beneath a fixed root using filesystem-aware containment checks.
  • Reject absolute, parent-relative, alternate-separator, device, link, and archive entries that escape the intended root.
  • Store uploads outside executable or served paths, validate type and size, and use private atomic temporary files.

Authoritative sources

Complete CVE record and remediation plan

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