CVE-1999-0867

Exp

Denial of service in IIS 4.0 via a flood of HTTP requests with malformed headers.

Published: 1999-08-11 Last update: 2026-04-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-1999-0867 is rated High Exploit Risk (70.7/100): CVSS Medium severity, with high exploitation likelihood (EPSS 19.42%, 95th percentile). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +2.41% over the last day, indicating growing attacker interest. 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.

Public exploit references (Exploit-DB) for CVE-1999-0867

EDB-ID Source Kind Published Link
19457 exploit_db edb 1999-08-11 Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-1999-0867

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 2025-10-24 17.01% 19.42% +2.41%
2 2025-07-22 21.49% 17.01% -4.48%
3 2025-06-18 — 21.49% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-1999-0867

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-1999-0867

Affected software / configurations for CVE-1999-0867

Vendor Product Version Raw CPE
microsoft commercial_internet_system 2.0 cpe:2.3:a:microsoft:commercial_internet_system:2.0:*:*:*:*:*:*:*
microsoft commercial_internet_system 2.5 cpe:2.3:a:microsoft:commercial_internet_system:2.5:*:*:*:*:*:*:*
microsoft internet_information_server 4.0 cpe:2.3:a:microsoft:internet_information_server:4.0:*:*:*:*:*:*:*
microsoft site_server 3.0 cpe:2.3:a:microsoft:site_server:3.0:unknown:commerce:*:*:*:*:*

References for CVE-1999-0867

cvelogic Threat Intelligence