CVE-1999-0945

Buffer overflow in Internet Mail Service (IMS) for Microsoft Exchange 5.5 and 5.0 allows remote attackers to conduct a denial of service via AUTH or AUTHINFO commands.

Published: 2001-03-12 Last update: 2026-04-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-1999-0945 is rated Moderate Risk (55/100): CVSS Medium severity, with high exploitation likelihood (EPSS 21.30%, 95th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +1.66% over the last day, indicating growing attacker interest. 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.

Exploit prediction scoring system (EPSS) score for CVE-1999-0945

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 2025-03-30 19.64% 21.30% +1.66%
2 2025-03-29 21.30% 19.64% -1.66%
3 2025-03-17 — 21.30% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-1999-0945

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-1999-0945

Affected software / configurations for CVE-1999-0945

Vendor Product Version Raw CPE
microsoft exchange_server 5.0 cpe:2.3:a:microsoft:exchange_server:5.0:-:*:*:*:*:*:*
microsoft exchange_server 5.5 cpe:2.3:a:microsoft:exchange_server:5.5:-:*:*:*:*:*:*

References for CVE-1999-0945

cvelogic Threat Intelligence