CVE-2001-1534

mod_usertrack in Apache 1.3.11 through 1.3.20 generates session ID's using predictable information including host IP address, system time and server process ID, which allows local users to obtain session ID's and bypass authentication when these session ID's are used for authentication.

Published: 2001-12-31 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2001-1534 is rated Low Risk (25.7/100): CVSS Low severity, with low exploitation likelihood (EPSS 0.70%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

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-2001-1534

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 2026-06-15 0.28% 0.70% +0.42%
2 2026-06-11 0.17% 0.28% +0.11%
3 2026-06-04 — 0.17% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2001-1534

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
2.1 2.0 LOW
AV:L/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 3.9 2.9 [email protected]

Weakness enumeration for CVE-2001-1534

OS Trackers for CVE-2001-1534

vendor priority summary link
debian unimportant CVE-2001-1534 unimportant priority: Debian including 1 source packages (apache2), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 5. https://security-tracker.debian.org/tracker/CVE-2001-1534
redhat — — https://access.redhat.com/security/cve/CVE-2001-1534

Vendor comments (NVD) for CVE-2001-1534

  • Red Hat (2006-08-30T00:00:00)

    This is not a security issue. The mod_usertrack cookies are not designed to be used for authentication.

Affected software / configurations for CVE-2001-1534

Vendor Product Version Raw CPE
apache http_server >= 1.3.11, <= 1.3.20 cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*

References for CVE-2001-1534

cvelogic Threat Intelligence