Microsoft IIS for Far East editions 4.0 and 5.0 allows remote attackers to read source code for parsed pages via a malformed URL that uses the lead-byte of a double-byte character.
Conclusion & alert: CVE-2000-1090 is rated Moderate Risk (58/100): CVSS Medium severity, with high exploitation likelihood (EPSS 16.66%, 97th percentile). Core evidence: EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +4.14% over the last day, indicating growing attacker interest. Mandatory action: High exploitation likelihood—assess exposure and prioritize remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
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 | 12.52% | 16.66% | +4.14% |
| 2 | 2025-03-30 | 10.26% | 12.52% | +2.25% |
| 3 | 2025-03-29 | — | 10.26% | — |
Full EPSS history (9 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 5.0 | 2.0 | MEDIUM |
|
10.0 | 2.9 | [email protected] |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| microsoft | internet_information_server | 4.0 | cpe:2.3:a:microsoft:internet_information_server:4.0:*:*:*:far_east:*:*:* |
| microsoft | internet_information_server | 5.0 | cpe:2.3:a:microsoft:internet_information_server:5.0:*:*:*:far_east:*:*:* |
| URL | Tags |
|---|---|
| http://www.nsfocus.com/english/homepage/sa_08.htm | Broken Link |
| http://www.securityfocus.com/bid/2100 | Third Party Advisory VDB Entry |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/5729 | Third Party Advisory VDB Entry |