Integer overflow in the JavaScript engine in Avant Browser 11.7 Build 9 and earlier allows remote attackers to cause a denial of service (application crash) by attempting to URL encode a string containing many instances of an invalid character.
Conclusion & alert: CVE-2008-4166 is rated Exploit Available (56.7/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.18%). Core evidence: 2 public exploit reference(s) are indexed (Exploit-DB). Mandatory action: Public exploits are available—assess exposure, apply mitigations, and prioritize patching.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
| EDB-ID | Source | Kind | Published | Link |
|---|---|---|---|---|
| 32381 | exploit_db | edb | 2008-09-12 | Exploit-DB ↗ |
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 5.63% | 2.18% | -3.45% |
| 2 | 2026-02-14 | 3.51% | 5.63% | +2.12% |
| 3 | 2025-11-12 | — | 3.51% | — |
Full EPSS history (16 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 4.3 | 2.0 | MEDIUM |
|
8.6 | 2.9 | [email protected] |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| avantbrowser | avant_browser | <= 11.7 | cpe:2.3:a:avantbrowser:avant_browser:*:build_9:*:*:*:*:*:* |