How severe is CVE-2009-3275?

CVE-2009-3275 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2009-3275 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-3275?

CVE-2009-3275 primarily affects Microsoft Enterprise Library. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-3275?

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

When was CVE-2009-3275 published?

CVE-2009-3275 was published on 2009-09-21 and last updated on 2026-06-16.

CVE-2009-3275

CVE-2009-3275 is a medium-severity vulnerability in Microsoft Enterprise Library with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-134.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 4% (88th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-134
Affected product: Microsoft Enterprise Library
Published: 2009-09-21
Last modified: 2026-06-16

Description

Blocks/Common/Src/Configuration/Manageability/Adm/AdmContentBuilder.cs in Microsoft patterns & practices Enterprise Library (aka EntLib) allows context-dependent attackers to cause a denial of service (CPU consumption) via an input string composed of many \ (backslash) characters followed by a " (double quote), related to a certain regular expression, aka a "ReDoS" vulnerability.

Frequently asked questions

What is CVE-2009-3275?: Blocks/Common/Src/Configuration/Manageability/Adm/AdmContentBuilder.cs in Microsoft patterns & practices Enterprise Library (aka EntLib) allows context-dependent attackers to cause a denial of service (CPU consumption) via an input string composed of many \ (backslash) characters followed by a " (double quote), related to a certain regular expression, aka a "ReDoS" vulnerability.
How severe is CVE-2009-3275?: CVE-2009-3275 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2009-3275 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-3275?: CVE-2009-3275 primarily affects Microsoft Enterprise Library. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-3275?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-3275 published?: CVE-2009-3275 was published on 2009-09-21 and last updated on 2026-06-16.

References

Affected products (3)

cpe:2.3:a:microsoft:enterprise_library:3.1:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:enterprise_library:4.0:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:enterprise_library:4.1:*:*:*:*:*:*:*

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