How severe is CVE-2011-0663?

CVE-2011-0663 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2011-0663 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 26% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-0663?

CVE-2011-0663 primarily affects Microsoft Jscript. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-0663?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2011-0663 published?

CVE-2011-0663 was published on 2011-04-13 and last updated on 2026-06-16.

CVE-2011-0663

CVE-2011-0663 is a high-severity vulnerability in Microsoft Jscript with a CVSS 3.x base score of 8.8. Its EPSS exploit-prediction score of 26% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-189.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.3
EPSS exploit prediction: 26% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-189
Affected product: Microsoft Jscript
Published: 2011-04-13
Last modified: 2026-06-16

Description

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."

Frequently asked questions

What is 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."
How severe is CVE-2011-0663?: CVE-2011-0663 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2011-0663 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 26% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-0663?: CVE-2011-0663 primarily affects Microsoft Jscript. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-0663?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2011-0663 published?: CVE-2011-0663 was published on 2011-04-13 and last updated on 2026-06-16.

References

Affected products (6)

cpe:2.3:a:microsoft:jscript:5.6:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:vbscript:5.6:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:jscript:5.7:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:vbscript:5.7:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:jscript:5.8:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:vbscript:5.8:*:*:*:*:*:*:*

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