VDB-14783 · CVE-1999-0725 · XFDB 2302

Microsoft IIS 3.0/4.0 Asian Language Double Byte Code config

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.
6.7	$0-$5k	0.00

Summaryinfo

A vulnerability classified as critical has been found in Microsoft IIS 3.0/4.0. Affected is an unknown function of the component Asian Language Handler. The manipulation as part of Double Byte Code leads to config. This vulnerability is listed as CVE-1999-0725. In addition, an exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Microsoft IIS 3.0/4.0 (Web Server) and classified as critical. This issue affects some unknown processing of the component Asian Language Handler. The manipulation as part of a Double Byte Code leads to a config vulnerability. Using CWE to declare the problem leads to CWE-16. Impacted is confidentiality. The summary by CVE is:

When IIS is run with a default language of Chinese, Korean, or Japanese, it allows a remote attacker to view the source code of certain files, a.k.a. "Double Byte Code Page".

The issue has been introduced in 05/15/1997. The weakness was presented 08/19/1999 with Microsoft (Website). It is possible to read the advisory at support.microsoft.com. The identification of this vulnerability is CVE-1999-0725. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are unknown but a public exploit is available. The attack technique deployed by this issue is T1592.004 according to MITRE ATT&CK.

The exploit is available at exploit-db.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 826 days. During that time the estimated underground price was around $25k-$100k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 90483 (Microsoft NT IIS Double Byte Code Page Vulnerability (MS99-022)).

Upgrading to version 5.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (2302), Exploit-DB (19361), SecurityFocus (BID 477†) and Vulnerability Center (SBV-3055†). Be aware that VulDB is the high quality source for vulnerability data.

Not Affected

Microsoft IIS 2.0

Productinfo

Type

Web Server

Vendor

Microsoft

Name

Version

License

commercial

Website

Vendor: https://www.microsoft.com/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 6.7

VulDB Base Score: 7.5
VulDB Temp Score: 6.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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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: Config
CWE: CWE-16
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

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

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: IIS 5.0
ISS Proventia IPS: 🔍

Timelineinfo

05/15/1997 🔍
06/24/1999 +770 days 🔍
06/24/1999 +0 days 🔍
08/19/1999 +56 days 🔍
08/19/1999 +0 days 🔍
12/01/2003 +1565 days 🔍
06/21/2014 +3855 days 🔍
10/23/2025 +4142 days 🔍