CVE-2020-9399

MEDIUMNVD 5.55.5—

5.5

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.

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 30.5%
KEV: Not listed

Published

February 28, 2020

Last Modified

November 21, 2024

References (4)

cve@mitrehttps://blog.zoller.lu/p/tzo-23-2020-avast-generic-archive.html
cve@mitrehttps://seclists.org/fulldisclosure/2020/Feb/35
af854a3a-2127-422b-91ae-364da2661108https://blog.zoller.lu/p/tzo-23-2020-avast-generic-archive.html
af854a3a-2127-422b-91ae-364da2661108https://seclists.org/fulldisclosure/2020/Feb/35

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 18× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 07:11 UTCEG score recompute
2026-05-27 07:11 UTCGHSA enrichment
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2020-9399?

CVE-2020-9399 is a medium vulnerability published on February 28, 2020. 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.

When was CVE-2020-9399 disclosed?

CVE-2020-9399 was first published in the National Vulnerability Database on February 28, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2020-9399 actively exploited?

CVE-2020-9399 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 30.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-9399?

CVE-2020-9399 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2020-9399?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-9399, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2020-9399

📅 Published

🔄 Last Modified

🔗 References (4)

Weakness Classification(2)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2020-9399?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (4)

Frequently asked(5)

Related CVEs(same CWE)