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CVE-2020-9399

16
FAUCET Score

CVE-2020-9399 describes a medium-severity vulnerability in Avast Antivirus products, including Antivirus Pro, Antivirus Pro Plus, and Antivirus for Linux, affecting versions before 12 definitions 200114-0. This flaw allows for a virus-detection bypass through a specially crafted ZIP archive, potentially enabling malicious code to evade scanning. The attack requires user interaction (UI:R) and local access (AV:L), with a high impact on integrity (I:H) if exploited. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 12.0CPE matchmatch criteria
cpe:2.3:a:avast:antivirus_for_linux:*:*:*:*:*:*:*:*
< 12.0CPE matchmatch criteria
cpe:2.3:a:avast:antivirus_pro:*:*:*:*:*:*:*:*
< 12.0CPE matchmatch criteria
cpe:2.3:a:avast:antivirus_pro_plus:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.5MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.16%
Probability of exploitation in next 30 days
EPSS Percentile
64.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0116 is in the 75th percentile among its peer group of 5,765 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

blog.zoller.lu / p/tzo-23-2020-avast-generic-archive.html
Third Party Advisory
seclists.org / fulldisclosure/2020/Feb/35
Mailing ListThird Party Advisory