CVE-2000-1055

CRITICAL

Buffer overflow in CiscoSecure ACS Server 2.4(2) and earlier allows remote attackers to cause a denial of service and possibly execute arbitrary commands via a large TACACS+ packet.

Affects 1 product across 1 vendor.

BCS7.63
CVSS 2.010.0
EPSS4.0%
Percentile90th
PatchPatched
CVSS Vector — Plain English Remotely exploitable over the network, low complexity.
◆ SAGE Intelligence — CITED Relevance Research Team

This vulnerability was disclosed in 2000. A critical vulnerability affects Cisco systems (CVE-2000-1055). No public exploit code is currently available. Isolate affected systems if patching is not feasible.

BSID: BS-2000-GLOBAL-348998-C • Model: rule-based-v1 • Confidence: MEDIUM

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Frequently Asked Questions
What is CVE-2000-1055?
This vulnerability was disclosed in 2000. A critical vulnerability affects Cisco systems (CVE-2000-1055). No public exploit code is currently available. Isolate affected systems if patching is not feasible.
What is the CVSS score for CVE-2000-1055?
CVE-2000-1055 has CVSS 10.0 (Critical). Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C. EPSS: 4.0%.
Is CVE-2000-1055 actively exploited?
No confirmed active exploitation of CVE-2000-1055 as of 2026-05-30.
How do I remediate CVE-2000-1055?
Priority: MEDIUM. Advisory: http://www.cisco.com/warp/public/707/csecureacsnt-pub.shtml PSIRT: [email protected]
What systems are affected by CVE-2000-1055?
CVE-2000-1055 affects: Cisco.
Vulnerability Details
CVE IDCVE-2000-1055
BSIDBS-2000-GLOBAL-348998-C BreachSpider Global ID
CVSS VectorAV:N/AC:L/Au:N/C:C/I:C/A:C
Published2000-12-11
Last Modified2026-04-16
ICS Relevance55%
Domains
NETWORK-INFRA
SourceNVD
Official Description

Buffer overflow in CiscoSecure ACS Server 2.4(2) and earlier allows remote attackers to cause a denial of service and possibly execute arbitrary commands via a large TACACS+ packet.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

Vulnerability details: Buffer overflow in CiscoSecure ACS Server 2.4(2) and earlier allows remote attackers to cause a denial of service and possibly execute arbitrary commands via a large TACACS+ packet. CVSS vector: AV:N/AC:L/Au:N/C:C/I:C/A:C.

Exploitation Likelihood: LOW

Affected Products
VendorProductFixed Version
Cisco Secure Access Control Server —
Remediation
View Vendor Advisory →

Remediation Priority: MEDIUM

Vendor PSIRT: [email protected]
Threat Intelligence
● Threat Intelligence Validated: August 2026 | Threat Age: 9364 Days
CISA KEVNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
SAGE Enrichment Record — provenance & audit hash
Modelrule-based-v1
ConfidenceMEDIUM
Enriched At2026-05-24
SHA-512 Audit Hash4b09d4cef3dd9822053d557d19475956fd0604224b3a2bca263a08359f5386a6d357bf2371218e4a7481520e91fdec87123e8e93ae71319f0a9f2d6b204d69ba
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