CVE-1999-0040

NONECVSS 0.0Weaponized

0.0

Buffer overflow in Xt library of X Windowing System allows local users to execute commands with root privileges.

CVSS v3: —
EG Score: —
EPSS: 39.5%
KEV: Not listed

Published

May 1, 1997

Last Modified

April 16, 2026

References (2)

cve@mitrehttps://exchange.xforce.ibmcloud.com/vulnerabilities/CVE-1999-0040
af854a3a-2127-422b-91ae-364da2661108https://exchange.xforce.ibmcloud.com/vulnerabilities/CVE-1999-0040

Data Freshness Timeline

(refreshed 14× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-29 13:40 UTCepss_batch
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Publicly available exploits

(5 references)

Working exploit code is in the public domain (5 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Exploit-DBEDB-19200✓ verified
First seen Aug 25, 1997
BSD/OS 2.1 / Caldera UnixWare 7/7.1.0 / FreeBSD 1.1.5.1/2.0 / HP HP-UX 10.34 / IBM AIX 4.2 / SGI IRIX 6.3 / SunOS 4.1.4 - 'libXt Library' Local Overflow / Local Privilege Escalation (1)
Open source ↗
Exploit-DBEDB-19201✓ verified
First seen Aug 25, 1997
BSD/OS 2.1 / Caldera UnixWare 7/7.1.0 / FreeBSD 1.1.5.1/2.0 / HP HP-UX 10.34 / IBM AIX 4.2 / SGI IRIX 6.3 / SunOS 4.1.4 - 'libXt Library' Local Overflow / Local Privilege Escalation (2)
Open source ↗
Exploit-DBEDB-19202✓ verified
First seen Aug 25, 1997
BSD/OS 2.1 / Caldera UnixWare 7/7.1.0 / FreeBSD 1.1.5.1/2.0 / HP HP-UX 10.34 / IBM AIX 4.2 / SGI IRIX 6.3 / SunOS 4.1.4 - 'libXt Library' Local Overflow / Local Privilege Escalation (3)
Open source ↗
Exploit-DBEDB-331✓ verified
First seen May 14, 1997
LibXt - 'XtAppInitialize()' Local Overflow *xterm
Open source ↗
Exploit-DBEDB-322✓ verified
First seen Aug 24, 1996
Xt Library - Local Privilege Escalation
Open source ↗

Frequently asked(4)

What is CVE-1999-0040?

CVE-1999-0040 is a none vulnerability published on May 1, 1997. Buffer overflow in Xt library of X Windowing System allows local users to execute commands with root privileges.

When was CVE-1999-0040 disclosed?

CVE-1999-0040 was first published in the National Vulnerability Database on May 1, 1997, with the most recent update on April 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-1999-0040 actively exploited?

CVE-1999-0040 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 39.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

How do I remediate CVE-1999-0040?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-1999-0040, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-1999-0040

📅 Published

🔄 Last Modified

🔗 References (2)