Microsoft Internet Explorer 3.0/4.0 Javascript information disclosure

CVSS Meta Temp Score
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Current Exploit Price (≈)
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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.
4.1$0-$5k0.00

Summaryinfo

A vulnerability was found in Microsoft Internet Explorer 3.0/4.0. It has been rated as problematic. Affected by this vulnerability is an unknown functionality of the component Javascript Handler. The manipulation leads to information disclosure. This vulnerability is uniquely identified as CVE-1999-0031. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Microsoft Internet Explorer 3.0/4.0 (Web Browser) and classified as problematic. This issue affects an unknown function of the component Javascript Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. The summary by CVE is:

JavaScript in Internet Explorer 3.x and 4.x, and Netscape 2.x, 3.x and 4.x, allows remote attackers to monitor a user's web activities, aka the Bell Labs vulnerability.

The issue has been introduced in 08/13/1996. The weakness was disclosed 07/08/1997 as HPSBUX9707-065 as not defined advisory (Website). The advisory is shared at codetalker.com. The identification of this vulnerability is CVE-1999-0031. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 329 days. During that time the estimated underground price was around $5k-$25k.

Upgrading to version 5.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (366) and Vulnerability Center (SBV-1074†). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Microsoft Internet Explorer 3.0/4.0
  • Netscape Communicator 2.0/3.0/4.0

Productinfo

Type

Vendor

Name

Version

License

Support

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Internet Explorer 5.0

Timelineinfo

08/13/1996 🔍
07/08/1997 +329 days 🔍
07/08/1997 +0 days 🔍
01/01/1999 +542 days 🔍
02/25/2003 +1516 days 🔍
06/18/2014 +4131 days 🔍
04/16/2026 +4320 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: HPSBUX9707-065
Status: Confirmed

CVE: CVE-1999-0031 (🔍)
GCVE (CVE): GCVE-0-1999-0031
GCVE (VulDB): GCVE-100-13937
X-Force: 366
Vulnerability Center: 1074 - Netscape Navigator Enables Execution of JavaScript Code, Medium

Entryinfo

Created: 06/18/2014 12:09
Updated: 04/16/2026 21:04
Changes: 06/18/2014 12:09 (46), 04/07/2017 12:05 (16), 04/16/2026 21:04 (18)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion

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