How severe is CVE-2008-4033?

CVE-2008-4033 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2008-4033 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 28% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2008-4033?

CVE-2008-4033 primarily affects Microsoft Xml Core Services. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2008-4033?

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

When was CVE-2008-4033 published?

CVE-2008-4033 was published on 2008-11-12 and last updated on 2026-06-16.

CVE-2008-4033

CVE-2008-4033 is a medium-severity vulnerability in Microsoft Xml Core Services with a CVSS 2.0 base score of 4.3. Its EPSS exploit-prediction score of 28% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-200.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 28% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Microsoft Xml Core Services
Published: 2008-11-12
Last modified: 2026-06-16

Description

Cross-domain vulnerability in Microsoft XML Core Services 3.0 through 6.0, as used in Microsoft Expression Web, Office, Internet Explorer, and other products, allows remote attackers to obtain sensitive information from another domain and corrupt the session state via HTTP request header fields, as demonstrated by the Transfer-Encoding field, aka "MSXML Header Request Vulnerability."

Frequently asked questions

What is CVE-2008-4033?: Cross-domain vulnerability in Microsoft XML Core Services 3.0 through 6.0, as used in Microsoft Expression Web, Office, Internet Explorer, and other products, allows remote attackers to obtain sensitive information from another domain and corrupt the session state via HTTP request header fields, as demonstrated by the Transfer-Encoding field, aka "MSXML Header Request Vulnerability."
How severe is CVE-2008-4033?: CVE-2008-4033 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2008-4033 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 28% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2008-4033?: CVE-2008-4033 primarily affects Microsoft Xml Core Services. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2008-4033?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2008-4033 published?: CVE-2008-4033 was published on 2008-11-12 and last updated on 2026-06-16.

References

Affected products (4)

cpe:2.3:a:microsoft:xml_core_services:4.0:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:xml_core_services:3.0:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:xml_core_services:6.0:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:xml_core_services:5.0:*:*:*:*:*:*:*

More vulnerabilities in Microsoft Xml Core Services

CVE-2013-0007 — Critical (CVSS 9.3): Microsoft XML Core Services (aka MSXML) 4.0, 5.0, and 6.0 does not properly parse XML content, which allows remote…
CVE-2010-2561 — Critical (CVSS 9.3): Microsoft XML Core Services (aka MSXML) 3.0 does not properly handle HTTP responses, which allows remote attackers to…
CVE-2007-2223 — Critical (CVSS 9.3): Microsoft XML Core Services (MSXML) 3.0 through 6.0 allows remote attackers to execute arbitrary code via the…
CVE-2007-0099 — Critical (CVSS 9.3): Race condition in the msxml3 module in Microsoft XML Core Services 3.0, as used in Internet Explorer 6 and other…
CVE-2016-0147 — High (CVSS 8.8): Microsoft XML Core Services 3.0 allows remote attackers to execute arbitrary code via a crafted web site, aka "MSXML…
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