CVE-2001-0427

Cisco VPN 3000 series concentrators before 2.5.2(F) allow remote attackers to cause a denial of service via a flood of invalid login requests to (1) the SSL service, or (2) the telnet service, which do not properly disconnect the user after several failed login attempts.

Published: 2001-06-18 Last update: 2026-04-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2001-0427 is rated Moderate Risk (54/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.85%). 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-2001-0427

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 0.76% 0.85% +0.09%
2 2025-03-29 0.85% 0.76% -0.09%
3 2025-03-17 — 0.85% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2001-0427

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.1 2.0 HIGH
AV:N/AC:M/Au:N/C:N/I:N/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.6 6.9 [email protected]

Weakness enumeration for CVE-2001-0427

Affected software / configurations for CVE-2001-0427

Vendor Product Version Raw CPE
cisco vpn_3000_concentrator — cpe:2.3:h:cisco:vpn_3000_concentrator:*:*:*:*:*:*:*:*
cisco vpn_3005_concentrator — cpe:2.3:h:cisco:vpn_3005_concentrator:*:*:*:*:*:*:*:*
cisco vpn_3015_concentrator — cpe:2.3:h:cisco:vpn_3015_concentrator:*:*:*:*:*:*:*:*
cisco vpn_3030_concentator — cpe:2.3:h:cisco:vpn_3030_concentator:*:*:*:*:*:*:*:*
cisco vpn_3060_concentrator — cpe:2.3:h:cisco:vpn_3060_concentrator:*:*:*:*:*:*:*:*
cisco vpn_3080_concentrator — cpe:2.3:h:cisco:vpn_3080_concentrator:*:*:*:*:*:*:*:*

References for CVE-2001-0427

cvelogic Threat Intelligence