Microsoft IIS 4.0 Frontpage Server Extensions fpcount.exe memory corruption

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.
9.5$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in Microsoft IIS 4.0. The impacted element is an unknown function of the file fpcount.exe of the component Frontpage Server Extensions. Such manipulation leads to memory corruption. This vulnerability is referenced as CVE-1999-1376. Furthermore, an exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Microsoft IIS 4.0 (Web Server) and classified as very critical. Affected by this issue is some unknown functionality of the file fpcount.exe of the component Frontpage Server Extensions. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Buffer overflow in fpcount.exe in IIS 4.0 with FrontPage Server Extensions allows remote attackers to execute arbitrary commands.

The weakness was published 01/14/1999 by FIRST as not defined posting (Bugtraq). The advisory is available at marc.theaimsgroup.com. This vulnerability is handled as CVE-1999-1376. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details as well as a private exploit are known. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/20/2025).

It is declared as highly functional. The vulnerability scanner Nessus provides a plugin with the ID 11370 (Microsoft IIS fpcount.exe CGI Remote Overflow), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CGI abuses and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 10041 (fpcount.exe CGI Vulnerability).

Upgrading eliminates this vulnerability. Attack attempts may be identified with Snort ID 1012. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 1181.

The vulnerability is also documented in the databases at Tenable (11370), SecurityFocus (BID 2252†) and Vulnerability Center (SBV-1174†). Similar entry is available at VDB-14451. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

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

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Private
Status: Highly functional

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 11370
Nessus Name: Microsoft IIS fpcount.exe CGI Remote Overflow
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍
Snort ID: 1012
Snort Message: SERVER-IIS fpcount attempt
Snort Class: 🔍

Suricata ID: 2101013
Suricata Class: 🔍
Suricata Message: 🔍

TippingPoint: 🔍

McAfee IPS: 🔍
McAfee IPS Version: 🔍

SourceFire IPS: 🔍

Timelineinfo

01/14/1999 🔍
01/14/1999 +0 days 🔍
01/14/1999 +0 days 🔍
01/14/1999 +0 days 🔍
03/13/2003 +1519 days 🔍
05/29/2003 +77 days 🔍
06/20/2014 +4040 days 🔍
10/20/2025 +4140 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: marc.theaimsgroup.com
Researcher: FIRST
Status: Confirmed

CVE: CVE-1999-1376 (🔍)
GCVE (CVE): GCVE-0-1999-1376
GCVE (VulDB): GCVE-100-14450
SecurityFocus: 2252 - IIS 4.0 fpcount.exe Buffer Overflow Vulnerability
Vulnerability Center: 1174 - Buffer Overflow in IIS 4.0 with FrontPage Server Extensions Allows Arbitrary Commands Execution, High

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

Entryinfo

Created: 06/20/2014 12:54
Updated: 10/20/2025 04:41
Changes: 06/20/2014 12:54 (77), 05/09/2019 20:42 (3), 10/20/2025 04:41 (19)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you know our Splunk app?

Download it now for free!