CVE-2020-9274Public exploitNetwork attack vector

Authenticated service crash via unterminated alias list

Published Feb 26, 2020 · Updated Aug 4, 2024

Out-of-bounds read in Pure-FTPd 1.0.49 allows remote authenticated users to crash the FTP service through the SITE alias command. The init_aliases function in diraliases.c leaves the final diraliases node's next pointer uninitialized, so lookup_alias and print_aliases traverse past the list. A valid FTP login, directory-alias support, and a configured alias file are required; the demonstrated consequence is a server crash.

CVSS severity7.5
High
EPSS probability5.96%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Pure-FTPd 1.0.49 allows remote authenticated users to crash the FTP service through the SITE alias command. The init_aliases function in diraliases.c leaves the final diraliases node's next pointer uninitialized, so lookup_alias and print_aliases traverse past the list. A valid FTP login, directory-alias support, and a configured alias file are required; the demonstrated consequence is a server crash.

The record

CVE
CVE-2020-9274
Published
Feb 26, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-824, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2020CVE 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 vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.0NVDAV:N/AC:L/Au:N/C:P/I:N/A:N

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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-824Access of Uninitialized Pointer
T1499Endpoint Denial of Service

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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