CVE-2020-9399 json
The Avast AV parsing engine allows virus-detection bypass via a crafted ZIP archive.
published 2020-02-28 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-30220
- cvss
- 5.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.2%
- EPSS 1.2% chance of exploitation in 30 days, percentile 67%
- public exploits
- 0
- none known
Summary
The Avast AV parsing engine allows virus-detection bypass via a crafted ZIP archive. This affects versions before 12 definitions 200114-0 of Antivirus Pro, Antivirus Pro Plus, and Antivirus for Linux.
Patch / fix
- avast antivirus_for_linux 12.0
- avast antivirus_pro 12.0
- avast antivirus_pro_plus 12.0
Exploit prediction
1.16% chance of exploitation in the next 30 days, higher than 67% 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-436 Interpretation Conflict
References
-
blog.zoller.lu
/p/tzo-23-2020-avast-generic-archive.html
third-party-advisory
-
seclists.org
/fulldisclosure/2020/Feb/35
mailing-list, third-party-advisory
Sources
- CVE List CVE-2020-9399
- NVD CVE-2020-9399
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.