CVE-2020-9320 json
Avira AV Engine before 8.3.54.138 allows virus-detection bypass via a crafted ISO archive.
published 2020-02-20 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-30142
- cvss
- 5.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.9%
- EPSS 2.9% chance of exploitation in 30 days, percentile 86%
- public exploits
- 0
- none known
Summary
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
Patch / fix
- 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
Exploit prediction
2.88% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 5.5 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
Classification
- Weakness
-
- CWE-434 Unrestricted Upload of File with Dangerous Type
References
-
blog.zoller.lu
/p/from-low-hanging-fruit-department-avira.html
third-party-advisory
- zoller.lu /%5BTZO-01-2020%5D%20AVIRA%20Generic%20Bypass%20ISO.pdf
-
packetstormsecurity.com
/files/156472/AVIRA-Generic-Malformed-Container-Bypass.html
third-party-advisory, vdb-entry
-
seclists.org
/fulldisclosure/2020/Feb/31
mailing-list, third-party-advisory
Sources
- CVE List CVE-2020-9320
- NVD CVE-2020-9320
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.