VDB-182008 · CVE-2021-40524 · Nessus 272225

Pure-FTPd 1.0.49 Max File Size Quota denial of service

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.4	$0-$5k	0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in Pure-FTPd 1.0.49. This affects an unknown part of the component Max File Size Quota. Executing a manipulation can lead to denial of service. This vulnerability appears as CVE-2021-40524. There is no available exploit. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability classified as problematic was found in Pure-FTPd 1.0.49 (File Transfer Software). This vulnerability affects an unknown functionality of the component Max File Size Quota. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. CVE summarizes:

In Pure-FTPd before 1.0.50, an incorrect max_filesize quota mechanism in the server allows attackers to upload files of unbounded size, which may lead to denial of service or a server hang. This occurs because a certain greater-than-zero test does not anticipate an initial -1 value. (Versions 1.0.23 through 1.0.49 are affected.)

The weakness was presented 09/05/2021. The advisory is shared for download at github.com. This vulnerability was named CVE-2021-40524. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 272225 (Debian dla-4360 : pure-ftpd - security update), which helps to determine the existence of the flaw in a target environment.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at Tenable (272225). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

File Transfer Software

Name

Pure-FTPd

Version

1.0.49

CPE 2.3info

🔍

CPE 2.2info

🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 272225
Nessus Name: Debian dla-4360 : pure-ftpd - security update

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: github.com

Timelineinfo

09/05/2021 🔍
09/05/2021 +0 days 🔍
09/05/2021 +0 days 🔍
11/05/2025 +1521 days 🔍

Sourcesinfo

Advisory: github.com
Status: Confirmed

CVE: CVE-2021-40524 (🔍)
GCVE (CVE): GCVE-0-2021-40524
GCVE (VulDB): GCVE-100-182008

Entryinfo

Created: 09/05/2021 23:25
Updated: 11/05/2025 00:21
Changes: 09/05/2021 23:25 (38), 09/09/2021 15:56 (2), 11/04/2025 08:30 (34), 11/05/2025 00:21 (2)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.