CVE-2001-0554

CRITICAL ⚠ Exploit

Buffer overflow in BSD-based telnetd telnet daemon on various operating systems allows remote attackers to execute arbitrary commands via a set of options including AYT (Are You There), which is no...

Affects 11 products across 9 vendors.

BCS8.9
CVSS 2.010.0
EPSS37.9%
Percentile98th
PatchPatched
CVSS Vector — Plain English Remotely exploitable over the network, low complexity.
CWE Weakness Definitions
CWE-120: Buffer Copy without Checking Size (Classic Buffer Overflow)

Program copies data to a buffer without verifying the source data fits within the destination.

◆ SAGE Intelligence — CITED Relevance Research Team

A buffer overflow vulnerability in the BSD-based telnetd daemon allows remote attackers to execute arbitrary commands, posing a significant security risk.

BSID: BS-2001-GLOBAL-169826-C • Model: /workspace/models/qwen2.5-coder-32b-instruct-bf16 • Confidence: HIGH

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Frequently Asked Questions
What is CVE-2001-0554?
A buffer overflow vulnerability in the BSD-based telnetd daemon allows remote attackers to execute arbitrary commands, posing a significant security risk.
What is the CVSS score for CVE-2001-0554?
CVE-2001-0554 has CVSS 10.0 (Critical). Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C. EPSS: 37.9%.
Is CVE-2001-0554 actively exploited?
Public exploit available for CVE-2001-0554. Exploitation risk elevated.
How do I remediate CVE-2001-0554?
Priority: IMMEDIATE. Advisory: ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-01:49.telnetd.asc PSIRT: [email protected]
What systems are affected by CVE-2001-0554?
CVE-2001-0554 affects: Debian, Freebsd, Ibm, Mit, Mit, Netbsd, Netkit, Openbsd.
Vulnerability Details
CVE IDCVE-2001-0554
BSIDBS-2001-GLOBAL-169826-C BreachSpider Global ID
CVSS VectorAV:N/AC:L/Au:N/C:C/I:C/A:C
Published2001-08-14
Last Modified2026-04-16
ICS Relevance15%
Weakness (CWE)
Buffer Copy without Checking Size (Classic Buffer Overflow)
SourceNVD
Official Description

Buffer overflow in BSD-based telnetd telnet daemon on various operating systems allows remote attackers to execute arbitrary commands via a set of options including AYT (Are You There), which is not properly handled by the telrcv function.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

The vulnerability is triggered by a set of options, including AYT (Are You There), which is not properly handled by the telrcv function, leading to a buffer overflow.

Exploitation Likelihood: CRITICAL

Affected Products
VendorProductFixed Version
Debian Debian Linux —
Freebsd Freebsd —
Ibm Aix —
Mit Kerberos —
Mit Kerberos 5 —
Netbsd Netbsd —
Netkit Linux Netkit —
Openbsd Openbsd —
Sgi Irix —
Sun Solaris —
Sun Sunos —
Remediation
View Vendor Advisory →

Remediation Priority: IMMEDIATE

Vendor PSIRT: [email protected]
Threat Intelligence
● Threat Intelligence Validated: July 2026 | Threat Age: 9106 Days
CISA KEVNot in KEV catalog
Public Exploit⚠ Available — Reference
PoC CodeNot confirmed
SAGE Enrichment Record — provenance & audit hash
Model/workspace/models/qwen2.5-coder-32b-instruct-bf16
ConfidenceHIGH
Enriched At2026-05-24
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