CVE-1999-0526

An X server's access control is disabled (e.g. through an "xhost +" command) and allows anyone to connect to the server.

Published: 1997-07-01 Last update: 2026-04-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-1999-0526 is rated High Risk (71/100): CVSS Critical severity, with high exploitation likelihood (EPSS 72.65%, 99th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. 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-1999-0526

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 2026-04-20 76.22% 72.65% -3.56%
2 2026-03-21 70.75% 76.22% +5.47%
3 2026-01-31 — 70.75% —

Full EPSS history (22 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-1999-0526

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-1999-0526

Affected software / configurations for CVE-1999-0526

Vendor Product Version Raw CPE
x.org x11 7.1_1.1.0 cpe:2.3:a:x.org:x11:7.1_1.1.0:*:*:*:*:*:*:*

References for CVE-1999-0526

URL Tags
http://www.kb.cert.org/vuls/id/704969 US Government Resource
cvelogic Threat Intelligence