CVE-2020-9320

Name: CVE-2020-9320
Creator: NVD / NIST
Published: 2020-02-20T22:15:12.257+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 2.81%

Last modified Jun 17, 2026

CVE-2020-9320 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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. EPSS estimates a 2.81% chance of exploitation in the next 30 days.

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

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

2.81%

84.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-434

Affected Software

Vendor	Product	Versions
Avira	Anti-Malware Sdk	< 8.3.54.138
Avira	Antivirus Server	< 8.3.54.138
Avira	Avira Antivirus For Endpoint	< 8.3.54.138
Avira	Avira Antivirus For Small Business	< 8.3.54.138
Avira	Avira Exchange Security	< 8.3.54.138
Avira	Avira Free Security Suite	< 8.3.54.138
Avira	Avira Internet Security Suite	< 8.3.54.138
Avira	Avira Prime	< 8.3.54.138

References

http://packetstormsecurity.com/files/156472/AVIRA-Generic-Malformed-Container-Bypass.htmlThird Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2020/Feb/31Mailing List, Third Party Advisory
https://blog.zoller.lu/p/from-low-hanging-fruit-department-avira.htmlThird Party Advisory
https://www.zoller.lu/%5BTZO-01-2020%5D%20AVIRA%20Generic%20Bypass%20ISO.pdf
http://packetstormsecurity.com/files/156472/AVIRA-Generic-Malformed-Container-Bypass.htmlThird Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2020/Feb/31Mailing List, Third Party Advisory
https://blog.zoller.lu/p/from-low-hanging-fruit-department-avira.htmlThird Party Advisory
https://www.zoller.lu/%5BTZO-01-2020%5D%20AVIRA%20Generic%20Bypass%20ISO.pdf

Timeline

Published: Feb 20, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-9320?

How severe is CVE-2020-9320?

CVE-2020-9320 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 2.81% probability of exploitation in the next 30 days.

How do I fix CVE-2020-9320?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-9320?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST