Jack De Winter WinSMTP 1.6f/2.x USER/HELO Command memory corruption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.1$0-$5k0.00

Summaryinfo

A vulnerability was found in Jack De Winter WinSMTP 1.6f/2.x and classified as critical. This vulnerability affects unknown code of the component USER/HELO Command Handler. Executing a manipulation can lead to memory corruption. The identification of this vulnerability is CVE-2000-0833. Furthermore, there is an exploit available.

Detailsinfo

A vulnerability was found in Jack De Winter WinSMTP 1.6f/2.x. It has been declared as very critical. This vulnerability affects an unknown code of the component USER/HELO Command Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Buffer overflow in WinSMTP 1.06f and 2.X allows remote attackers to cause a denial of service via a long (1) USER or (2) HELO command.

The weakness was shared 11/14/2000 (Website). The advisory is shared for download at xforce.iss.net. This vulnerability was named CVE-2000-0833. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are unknown but a public exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 10/12/2025).

A public exploit has been developed in Perl. It is possible to download the exploit at securityfocus.com. It is declared as proof-of-concept. The commercial vulnerability scanner Qualys is able to test this issue with plugin 74052 (Jack De Winter WinSMTP Buffer Overflow Vulnerability).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at X-Force (5255), Exploit-DB (20221), SecurityFocus (BID 1680†) and Vulnerability Center (SBV-882†). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.1

VulDB Base Score: 10.0
VulDB Temp Score: 9.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
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Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Programming Language: 🔍
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍
McAfee IPS: 🔍
McAfee IPS Version: 🔍

Timelineinfo

09/11/2000 🔍
09/11/2000 +0 days 🔍
11/14/2000 +64 days 🔍
11/14/2000 +0 days 🔍
02/09/2003 +817 days 🔍
06/28/2014 +4157 days 🔍
10/12/2025 +4124 days 🔍

Sourcesinfo

Advisory: xforce.iss.net
Status: Not defined

CVE: CVE-2000-0833 (🔍)
GCVE (CVE): GCVE-0-2000-0833
GCVE (VulDB): GCVE-100-15964
X-Force: 5255
SecurityFocus: 1680 - Jack De Winter WinSMTP Buffer Overflow Vulnerability
Vulnerability Center: 882 - Buffer Overflow in Jack De Winter WinSMTP via Long USER or HELO Commands, High

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 06/28/2014 15:56
Updated: 10/12/2025 19:44
Changes: 06/28/2014 15:56 (57), 05/09/2019 10:39 (5), 02/03/2025 14:44 (20), 10/12/2025 19:44 (3)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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