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

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HIGH

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 Sep 18, 2001

7.1

HIGH

CVSS 2.0

EPSS 2.52%

Description

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.

Affected products

Remediation

No remediation recorded yet.

Metrics

2.52% 0.02518

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.02518

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (10 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	2.52% (0.02518)	84.27th	v5 (v2026.06.15)
Jun 15, 2026	2.52% (0.02518)	82.72th	v5 (v2026.06.15)
Mar 17, 2025	0.85% (0.00855)	73.36th	v4 (v2025.03.14)
Dec 12, 2024	0.65% (0.00646)	79.99th	v3 (v2023.03.01)
Feb 8, 2024	0.65% (0.00646)	78.63th	v3 (v2023.03.01)
Mar 7, 2023	0.65% (0.00646)	76.10th	v3 (v2023.03.01)
Mar 6, 2023	1.14% (0.01136)	59.45th	v2 (v2022.01.01)
Oct 18, 2022	1.14% (0.01136)	58.28th	v2 (v2022.01.01)
Apr 1, 2022	1.14% (0.01136)	56.27th	v2 (v2022.01.01)
Feb 4, 2022	1.14% (0.01136)	34.23th	v2 (v2022.01.01)

Weaknesses (1)

CWE-20

Improper Input Validation

References (3)

http://www.cisco.com/warp/public/707/vpn3k-telnet-vuln-pub.shtml
vendor-advisoryx_refsource_CISCOPatchVendor Advisory
http://www.osvdb.org/5643
vdb-entryx_refsource_OSVDB
https://exchange.xforce.ibmcloud.com/vulnerabilities/6298
vdb-entryx_refsource_XF

Link	Providers	Tags
http://www.cisco.com/warp/public/707/vpn3k-telnet-vuln-pub.shtml		vendor-advisoryx_refsource_CISCOPatchVendor Advisory
http://www.osvdb.org/5643		vdb-entryx_refsource_OSVDB
https://exchange.xforce.ibmcloud.com/vulnerabilities/6298		vdb-entryx_refsource_XF

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner mitre

Published Sep 18, 2001

Updated Aug 8, 2024

Reserved May 24, 2001

Link CVE-2001-0427

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 16, 2026

Link CVE-2001-0427

Red Hat

Severity n/a

Public date n/a

Links CVE-2001-0427