CVE-2021-42624Public exploit

Local memory corruption via unbounded listing format

Published Nov 4, 2021 · Updated Aug 4, 2024

Stack buffer overflow in Miniftpd's ftpproto.c allows local users to corrupt memory through a crafted symbolic-link target during directory listing. In list_common(), readlink() can fill the 1,024-byte tmp array without termination, and sprintf() then appends that data and a filename to the partly filled 1,024-byte buf array without a length bound. Triggering the overwrite requires local control of a listed symbolic link; the public report demonstrates memory corruption but does not establish reliable code execution.

CVSS severity7.8
High
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in Miniftpd's ftpproto.c allows local users to corrupt memory through a crafted symbolic-link target during directory listing. In list_common(), readlink() can fill the 1,024-byte tmp array without termination, and sprintf() then appends that data and a filename to the partly filled 1,024-byte buf array without a length bound. Triggering the overwrite requires local control of a listed symbolic link; the public report demonstrates memory corruption but does not establish reliable code execution.

The record

CVE
CVE-2021-42624
Published
Nov 4, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 4, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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