How severe is CVE-2009-1784?

CVE-2009-1784 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-2009-1784 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-1784?

CVE-2009-1784 primarily affects Avg Avg Anti-virus. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-1784?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2009-1784 published?

CVE-2009-1784 was published on 2009-05-22 and last updated on 2026-06-16.

CVE-2009-1784

CVE-2009-1784 is a critical-severity vulnerability in Avg Avg Anti-virus with a CVSS 2.0 base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: Critical (CVSS 2.0 base score 10.0)
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Avg Avg Anti-virus
Published: 2009-05-22
Last modified: 2026-06-16

Description

The AVG parsing engine 8.5 323, as used in multiple AVG anti-virus products including Anti-Virus Network Edition, Internet Security Netzwerk Edition, Server Edition für Linux/FreeBSD, Anti-Virus SBS Edition, and others allows remote attackers to bypass malware detection via a crafted (1) RAR and (2) ZIP archive.

Frequently asked questions

What is CVE-2009-1784?: The AVG parsing engine 8.5 323, as used in multiple AVG anti-virus products including Anti-Virus Network Edition, Internet Security Netzwerk Edition, Server Edition für Linux/FreeBSD, Anti-Virus SBS Edition, and others allows remote attackers to bypass malware detection via a crafted (1) RAR and (2) ZIP archive.
How severe is CVE-2009-1784?: CVE-2009-1784 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2009-1784 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-1784?: CVE-2009-1784 primarily affects Avg Avg Anti-virus. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-1784?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2009-1784 published?: CVE-2009-1784 was published on 2009-05-22 and last updated on 2026-06-16.

References

Affected products (11)

cpe:2.3:a:avg:avg_anti-virus:*:*:*:*:*:*:*:*
cpe:2.3:a:avg:avg_anti-virus:6.0.710:*:*:*:*:*:*:*
cpe:2.3:a:avg:avg_anti-virus:7.0:*:*:*:*:*:*:*
cpe:2.3:a:avg:avg_anti-virus:7.0.251:*:*:*:*:*:*:*
cpe:2.3:a:avg:avg_anti-virus:7.0.323:*:*:*:*:*:*:*
cpe:2.3:a:avg:avg_anti-virus:7.1.308:*:*:*:*:*:*:*
cpe:2.3:a:avg:avg_anti-virus:7.1.407:*:*:*:*:*:*:*
cpe:2.3:a:avg:avg_anti-virus:7.5.51:*:*:*:*:*:*:*
cpe:2.3:a:avg:avg_anti-virus:7.5.448:*:*:*:*:*:*:*
cpe:2.3:a:avg:avg_anti-virus:7.5.476:*:*:*:*:*:*:*
cpe:2.3:a:avg:avg_anti-virus:8.0:*:*:*:*:*:*:*

More vulnerabilities in Avg Avg Anti-virus

CVE-2012-1462 — Medium (CVSS 4.3): The ZIP file parser in AhnLab V3 Internet Security 2011.01.18.00, AVG Anti-Virus 10.0.0.1190, Quick Heal (aka Cat…
CVE-2012-1461 — Medium (CVSS 4.3): The Gzip file parser in AVG Anti-Virus 10.0.0.1190, Bitdefender 7.2, Command Antivirus 5.2.11.5, Emsisoft Anti-Malware…
CVE-2012-1459 — Medium (CVSS 4.3): The TAR file parser in AhnLab V3 Internet Security 2011.01.18.00, Avira AntiVir 7.11.1.163, Antiy Labs AVL SDK 2.0.3.7,…
CVE-2012-1457 — Medium (CVSS 4.3): The TAR file parser in Avira AntiVir 7.11.1.163, Antiy Labs AVL SDK 2.0.3.7, avast! Antivirus 4.8.1351.0 and 5.0.677.0,…
CVE-2012-1456 — Medium (CVSS 4.3): The TAR file parser in AVG Anti-Virus 10.0.0.1190, Quick Heal (aka Cat QuickHeal) 11.00, Comodo Antivirus 7424,…
CVE-2012-1443 — Medium (CVSS 4.3): The RAR file parser in ClamAV 0.96.4, Rising Antivirus 22.83.00.03, Quick Heal (aka Cat QuickHeal) 11.00, G Data…

All CVEs affecting Avg Avg Anti-virus →

Other CWE-20 (Improper Input Validation) vulnerabilities

CVE-2026-48316 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48281 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48277 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48055 — Critical (CVSS 10.0): Streambert is a cross-platform Electron Desktop App to stream and download any video media. In versions 2.4.0 and…
CVE-2026-34910 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS…
CVE-2026-33587 — Critical (CVSS 10.0): Lack of user input sanitisation in Open Notebook v1.8.3 allows the application user to execute Python code (and…

Browse all CWE-20 (Improper Input Validation) vulnerabilities →