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TI-2008-05239 Aliases CVE-2008-5523GHSA-7fgh-8wj3-28pj

avast! antivirus 4.8.1281.0, when Internet Explorer 6 or 7 is used, allows remote…

Priority MEDIUM 45CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
— Not recorded in CVSS 2.0
Attack complexity
Medium
Impact type
—
Confidentiality · integrity · availability
Complete · Complete · Complete
Fix status
No fix listed

Attack profile from CVSS 2.0 · NVD. Fix status from CNA.

Summary

avast! antivirus 4.8.1281.0, 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.

Why it matters now

EPSS 0.02902 87th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:avast:avast_antivirus:4.8.1281.0:*:*:*:*:*:*:*4.8.1281.0VulnerableAvast
cpe:2.3:a:microsoft:internet_explorer:6:*:*:*:*:*:*:*6Running onMicrosoft
cpe:2.3:a:microsoft:internet_explorer:7:*:*:*:*:*:*:*7Running onMicrosoft
  • cpe:2.3:a:avast:avast_antivirus:4.8.1281.0:*:*:*:*:*:*:* Versions 4.8.1281.0 Vulnerable ·Avast
  • cpe:2.3:a:microsoft:internet_explorer:6:*:*:*:*:*:*:* Versions 6 Running on ·Microsoft
  • cpe:2.3:a:microsoft:internet_explorer:7:*:*:*:*:*:*:* Versions 7 Running on ·Microsoft

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2008-5523
  2. 2026-10-03 Alias added: GHSA-7fgh-8wj3-28pj

References

Advisory 1

  • TI-2007-02752 Heap-based buffer overflow in the CAB unpacker in avast! Anti-Virus Managed Client before… CVSS 2.0HIGH 9.3
  • TI-2007-01612 unzoo.c, as used in multiple products including AMaViS 2.4.1 and earlier, allows remote… CVSS 2.0HIGH 7.8
  • TI-2007-01611 avast! antivirus before 4.7.981 allows remote attackers to cause a denial of service… CVSS 2.0HIGH 7.8
  • TI-2008-06534 Multiple stack-based buffer overflows in avast! Linux Home Edition 1.0.5, 1.0.5-1, and… CVSS 2.0MEDIUM 6.8
  • TI-2015-04773 Directory traversal vulnerability in Avast before 150918-0 allows remote attackers to… CVSS 2.0MEDIUM 6.4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences