CVE-2001-0053

CRITICAL ⚠ Exploit

One-byte buffer overflow in replydirname function in BSD-based ftpd allows remote attackers to gain root privileges.

Affects 3 products across 3 vendors.

CVSS 2.010.0
EPSS17.9%
Percentile97th
PatchUnknown
CVSS Vector — Plain English Remotely exploitable over the network, low complexity.
◆ AI Analysis — automated analysis, not human-reviewed

A one-byte buffer overflow vulnerability in the replydirname function of BSD-based ftpd can be exploited by remote attackers to gain root privileges.

BSID: BS-2001-GLOBAL-156185-C • Model: /workspace/models/qwen2.5-coder-32b-instruct-bf16 • Confidence: HIGH

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Frequently Asked Questions
What is CVE-2001-0053?
A one-byte buffer overflow vulnerability in the replydirname function of BSD-based ftpd can be exploited by remote attackers to gain root privileges.
What is the CVSS score for CVE-2001-0053?
CVE-2001-0053 has CVSS 10.0 (Critical). Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C. EPSS: 17.9%.
Is CVE-2001-0053 actively exploited?
Public exploit available for CVE-2001-0053. Exploitation risk elevated.
How do I remediate CVE-2001-0053?
Priority: IMMEDIATE. Advisory: http://www.openbsd.org/advisories/ftpd_replydirname.txt PSIRT: [email protected]
What systems are affected by CVE-2001-0053?
CVE-2001-0053 affects David Madore Ftpd-Bsd; Netbsd Netbsd; Openbsd Openbsd.
Vulnerability Details
CVE IDCVE-2001-0053
BSIDBS-2001-GLOBAL-156185-C BreachSpider Global ID
CVSS VectorAV:N/AC:L/Au:N/C:C/I:C/A:C
Published2001-02-12
Last Modified2026-06-16
ICS Relevance0%
SourceNVD
Official Description

One-byte buffer overflow in replydirname function in BSD-based ftpd allows remote attackers to gain root privileges.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

The vulnerability occurs due to insufficient bounds checking in the replydirname function, allowing an attacker to overflow a buffer with a single byte. This can lead to arbitrary code execution and privilege escalation to root.

Exploitation Likelihood: CRITICAL

Affected Products
VendorProductAffected Versions
David Madore Ftpd-Bsd 0.2.3
Netbsd Netbsd 1.4 1.4.1 1.4.2 1.5
Openbsd Openbsd 2.4 2.5 2.6 2.7 2.8
Remediation
View Vendor Advisory →

Remediation Priority: IMMEDIATE

Vendor PSIRT: [email protected]
Threat Intelligence
● Threat Intelligence Validated: October 2026 | Threat Age: 9377 Days
CISA known-exploitedNot in KEV catalog
Public Exploit⚠ Available — Reference
PoC CodeNot confirmed
AI Enrichment Record — provenance & audit hash
Model/workspace/models/qwen2.5-coder-32b-instruct-bf16
ConfidenceHIGH
Enriched At2026-05-24
Related CVEs affecting David Madore
CVE-2001-0550 7.5 wu-ftpd 2.6.1 allows remote attackers to execute arbitrary commands via a "~{...
View all David Madore CVEs →

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