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Jscript CVE-2016-3206

HIGH
Improper Input Validation (CWE-20)
2016-06-16 secure@microsoft.com
7.5
CVSS 3.0 · NVD
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Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V2 - Validation and Business Logic Input validation, allowlisting
Impact

CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, high complexity, no privileges required, user interaction required. EPSS exploitation probability: 14.92%.

Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the high-severity affected system.

Act Now Prioritize within 24-48h. Why: HIGH severity + EPSS > 10%.
No patch listed yet 14.9% exploitation probability (EPSS)

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AnalysisAI

The Microsoft (1) JScript 5.8 and (2) VBScript 5.7 and 5.8 engines, as used in Internet Explorer 9 through 11 and other products, allow remote attackers to execute arbitrary code or cause a denial of. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required. Epss exploitation probability 14.9% and no vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

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Technical ContextAI · show details

This vulnerability is classified under CWE-20. The Microsoft (1) JScript 5.8 and (2) VBScript 5.7 and 5.8 engines, as used in Internet Explorer 9 through 11 and other products, allow remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site, aka "Scripting Engine Memory Corruption Vulnerability," a different vulnerability than CVE-2016-3205 and CVE-2016-3207. Affected products include: Microsoft Jscript, Microsoft Vbscript. Version information: through 11.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.5 HIGH
AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

DescriptionCVE.org

The Microsoft (1) JScript 5.8 and (2) VBScript 5.7 and 5.8 engines, as used in Internet Explorer 9 through 11 and other products, allow remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site, aka "Scripting Engine Memory Corruption Vulnerability," a different vulnerability than CVE-2016-3205 and CVE-2016-3207.

Threat Intelligence Overview

EPSS Score
14.9%
Top 5% exploitable
Data Quality
3 sources
Confidence: Low

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 14.9%
Patch available No
Active threat No
Deciding rule
HIGH severity + EPSS > 10%
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

53
Low Medium High Critical
KEV: 0
EPSS: +15
CVSS: +38
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)CVE.org

cpe:2.3:a:microsoft:jscript:5.8:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:vbscript:5.7:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:vbscript:5.8:*:*:*:*:*:*:*
CVE-2015-2482 CRITICAL POC
9.3 Oct 14

The Microsoft (1) VBScript 5.7 and 5.8 and (2) JScript 5.7 and 5.8 engines, as used in Internet Explorer 8 through 11 an

CVE-2012-2523 CRITICAL
9.3 Aug 15

Integer overflow in Microsoft Internet Explorer 8 and 9, JScript 5.8, and VBScript 5.8 on 64-bit platforms allows remote

CVE-2015-6136 CRITICAL
9.3 Dec 09

The Microsoft (1) VBScript 5.7 and 5.8 and (2) JScript 5.7 and 5.8 engines, as used in Internet Explorer 8 through 11 an

CVE-2015-6055 CRITICAL
9.3 Oct 14

The Microsoft (1) VBScript 5.7 and 5.8 and (2) JScript 5.7 and 5.8 engines, as used in Internet Explorer 8 through 11 an

CVE-2016-0002 HIGH
7.5 Jan 13

The Microsoft (1) VBScript 5.7 and 5.8 and (2) JScript 5.7 and 5.8 engines, as used in Internet Explorer 8 through 11 an

CVE-2015-6056 CRITICAL
9.3 Oct 14

The (1) JScript and (2) VBScript engines in Microsoft Internet Explorer 9 through 11 allow remote attackers to execute a

CVE-2015-6089 CRITICAL
9.3 Nov 11

The Microsoft (1) VBScript and (2) JScript engines, as used in Internet Explorer 8 through 11, allow remote attackers to

CVE-2016-0187 HIGH
7.5 May 11

The Microsoft (1) JScript 5.8 and (2) VBScript 5.8 engines, as used in Internet Explorer 9 through 11 and other products

CVE-2016-3205 HIGH
7.5 Jun 16

The Microsoft (1) JScript 5.8 and (2) VBScript 5.7 and 5.8 engines, as used in Internet Explorer 9 through 11 and other

CVE-2016-3202 HIGH
7.5 Jun 16

The Microsoft (1) Chakra JavaScript, (2) JScript, and (3) VBScript engines, as used in Microsoft Internet Explorer 10 an

CVE-2016-3207 HIGH
7.5 Jun 16

The Microsoft (1) JScript 5.8 and (2) VBScript 5.7 and 5.8 engines, as used in Internet Explorer 9 through 11 and other

CVE-2015-6059 MEDIUM
4.3 Oct 14

The Microsoft (1) VBScript 5.7 and 5.8 and (2) JScript 5.7 and 5.8 engines, as used in Internet Explorer 8 through 11 an

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