What’s Vulnerable › Vulnerabilities
CVE-2020-9320
- Severity: medium (CVSS 5.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 2.9% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2020-02-20 · updated 2026-06-17
- Weakness: CWE-434
Description
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
Affected products
- AVIRA Anti-Malware Sdk: before 8.3.54.138 — fixed in 8.3.54.138
- AVIRA Antivirus Server: before 8.3.54.138 — fixed in 8.3.54.138
- Avira Antivirus For Endpoint: before 8.3.54.138 — fixed in 8.3.54.138
- Avira Antivirus For Small Business: before 8.3.54.138 — fixed in 8.3.54.138
- Avira Exchange Security: before 8.3.54.138 — fixed in 8.3.54.138
- Avira Free Security Suite: before 8.3.54.138 — fixed in 8.3.54.138
- Avira Internet Security Suite: before 8.3.54.138 — fixed in 8.3.54.138
- Avira Prime: before 8.3.54.138 — fixed in 8.3.54.138
How to fix
Upgrade to a fixed version: AVIRA Anti-Malware Sdk 8.3.54.138; AVIRA Antivirus Server 8.3.54.138; Avira Antivirus For Endpoint 8.3.54.138; Avira Antivirus For Small Business 8.3.54.138; Avira Exchange Security 8.3.54.138; Avira Free Security Suite 8.3.54.138; Avira Internet Security Suite 8.3.54.138; Avira Prime 8.3.54.138. Check the vendor advisory for mitigations.
References
- http://packetstormsecurity.com/files/156472/AVIRA-Generic-Malformed-Container-Bypass.html
- http://seclists.org/fulldisclosure/2020/Feb/31
- https://blog.zoller.lu/p/from-low-hanging-fruit-department-avira.html
- https://www.zoller.lu/%5BTZO-01-2020%5D%20AVIRA%20Generic%20Bypass%20ISO.pdf
- http://packetstormsecurity.com/files/156472/AVIRA-Generic-Malformed-Container-Bypass.html
- http://seclists.org/fulldisclosure/2020/Feb/31
- https://blog.zoller.lu/p/from-low-hanging-fruit-department-avira.html
- https://www.zoller.lu/%5BTZO-01-2020%5D%20AVIRA%20Generic%20Bypass%20ISO.pdf
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