CVE-1999-0203

In Sendmail, attackers can gain root privileges via SMTP by specifying an improper "mail from" address and an invalid "rcpt to" address that would cause the mail to bounce to a program.

Published: 1995-08-17 Last update: 2026-04-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-1999-0203 is rated Moderate Risk (61.6/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.48%). Review affected assets and schedule 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-1999-0203

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 0.77% 0.48% -0.28%
2 2025-03-29 0.48% 0.77% +0.28%
3 2025-03-17 — 0.48% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-1999-0203

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
10.0 2.0 HIGH
AV:N/AC:L/Au:N/C:C/I:C/A:C 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:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 10.0 [email protected]

Weakness enumeration for CVE-1999-0203

OS Trackers for CVE-1999-0203

vendor priority summary link
alpine — CVE-1999-0203: no source package rows; 0 state rows across 0 repos (none); fixed 0, open 0. https://security.alpinelinux.org/vuln/CVE-1999-0203

Affected software / configurations for CVE-1999-0203

Vendor Product Version Raw CPE
eric_allman sendmail 8.6.10 cpe:2.3:a:eric_allman:sendmail:8.6.10:*:*:*:*:*:*:*

References for CVE-1999-0203

cvelogic Threat Intelligence