How severe is CVE-2008-5522?

CVE-2008-5522 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2008-5522 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2008-5522?

CVE-2008-5522 affects Avg Antivirus. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2008-5522?

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-2008-5522 published?

CVE-2008-5522 was published on 2008-12-12 and last updated on 2026-06-16.

CVE-2008-5522

CVE-2008-5522 is a critical-severity vulnerability in Avg Antivirus with a CVSS 2.0 base score of 9.3. 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 9.3)
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Avg Antivirus
Published: 2008-12-12
Last modified: 2026-06-16

Description

AVG Anti-Virus 8.0.0.161, when Internet Explorer 6 or 7 is used, allows remote attackers to bypass detection of malware in an HTML document by placing an MZ header (aka "EXE info") at the beginning, and modifying the filename to have (1) no extension, (2) a .txt extension, or (3) a .jpg extension, as demonstrated by a document containing a CVE-2006-5745 exploit.

Frequently asked questions

What is CVE-2008-5522?: AVG Anti-Virus 8.0.0.161, when Internet Explorer 6 or 7 is used, allows remote attackers to bypass detection of malware in an HTML document by placing an MZ header (aka "EXE info") at the beginning, and modifying the filename to have (1) no extension, (2) a .txt extension, or (3) a .jpg extension, as demonstrated by a document containing a CVE-2006-5745 exploit.
How severe is CVE-2008-5522?: CVE-2008-5522 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2008-5522 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2008-5522?: CVE-2008-5522 affects Avg Antivirus. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2008-5522?: 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-2008-5522 published?: CVE-2008-5522 was published on 2008-12-12 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:avg:antivirus:8.0.0.161:*:*:*:*:*:*:*

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