CVE-2011-0663

Multiple integer overflows in the Microsoft (1) JScript 5.6 through 5.8 and (2) VBScript 5.6 through 5.8 scripting engines allow remote attackers to execute arbitrary code via a crafted web page, aka "Scripting Memory Reallocation Vulnerability."

Published: 2011-04-13 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-0663 is rated High Risk (72/100): CVSS High severity, with high exploitation likelihood (EPSS 27.86%, 96th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +3.13% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2011-0663

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-12-28 24.73% 27.86% +3.13%
2 2025-12-27 27.86% 24.73% -3.13%
3 2025-10-28 — 27.86% —

Full EPSS history (18 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-0663

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0
9.3 2.0 HIGH
AV:N/AC:M/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.6 10.0 [email protected]

Weakness enumeration for CVE-2011-0663

Affected software / configurations for CVE-2011-0663

Vendor Product Version Raw CPE
microsoft jscript 5.6 cpe:2.3:a:microsoft:jscript:5.6:*:*:*:*:*:*:*
microsoft vbscript 5.6 cpe:2.3:a:microsoft:vbscript:5.6:*:*:*:*:*:*:*
microsoft jscript 5.7 cpe:2.3:a:microsoft:jscript:5.7:*:*:*:*:*:*:*
microsoft vbscript 5.7 cpe:2.3:a:microsoft:vbscript:5.7:*:*:*:*:*:*:*
microsoft jscript 5.8 cpe:2.3:a:microsoft:jscript:5.8:*:*:*:*:*:*:*
microsoft vbscript 5.8 cpe:2.3:a:microsoft:vbscript:5.8:*:*:*:*:*:*:*

References for CVE-2011-0663

cvelogic Threat Intelligence