How severe is CVE-2015-6138?

CVE-2015-6138 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2015-6138 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 12% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-6138?

CVE-2015-6138 primarily affects Microsoft Internet Explorer. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-6138?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2015-6138 published?

CVE-2015-6138 was published on 2015-12-09 and last updated on 2026-06-17.

CVE-2015-6138

CVE-2015-6138 is a medium-severity vulnerability in Microsoft Internet Explorer with a CVSS 2.0 base score of 4.3. Its EPSS exploit-prediction score of 12% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 12% (96th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Microsoft Internet Explorer
Published: 2015-12-09
Last modified: 2026-06-17

Description

Microsoft Internet Explorer 8 through 11 mishandles HTML attributes in HTTP responses, which allows remote attackers to bypass a cross-site scripting (XSS) protection mechanism via unspecified vectors, aka "Internet Explorer XSS Filter Bypass Vulnerability."

Frequently asked questions

What is CVE-2015-6138?: Microsoft Internet Explorer 8 through 11 mishandles HTML attributes in HTTP responses, which allows remote attackers to bypass a cross-site scripting (XSS) protection mechanism via unspecified vectors, aka "Internet Explorer XSS Filter Bypass Vulnerability."
How severe is CVE-2015-6138?: CVE-2015-6138 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2015-6138 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 12% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-6138?: CVE-2015-6138 primarily affects Microsoft Internet Explorer. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-6138?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2015-6138 published?: CVE-2015-6138 was published on 2015-12-09 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:a:microsoft:internet_explorer:8:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:9:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:10:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:11:-:*:*:*:*:*:*

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