How severe is CVE-2009-0537?

CVE-2009-0537 has a CVSS 2.0 base score of 4.9, rated medium severity.

Is CVE-2009-0537 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-2009-0537?

CVE-2009-0537 primarily affects Microsoft Interix. In total, 26 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-0537?

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

When was CVE-2009-0537 published?

CVE-2009-0537 was published on 2009-03-09 and last updated on 2026-06-16.

CVE-2009-0537

CVE-2009-0537 is a medium-severity vulnerability in Microsoft Interix with a CVSS 2.0 base score of 4.9. 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-189.

Key facts

Severity: Medium (CVSS 2.0 base score 4.9)
EPSS exploit prediction: 4% (88th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-189
Affected product: Microsoft Interix
Published: 2009-03-09
Last modified: 2026-06-16

Description

Integer overflow in the fts_build function in fts.c in libc in (1) OpenBSD 4.4 and earlier and (2) Microsoft Interix 6.0 build 10.0.6030.0 allows context-dependent attackers to cause a denial of service (application crash) via a deep directory tree, related to the fts_level structure member, as demonstrated by (a) du, (b) rm, (c) chmod, and (d) chgrp on OpenBSD; and (e) SearchIndexer.exe on Vista Enterprise.

Frequently asked questions

What is CVE-2009-0537?: Integer overflow in the fts_build function in fts.c in libc in (1) OpenBSD 4.4 and earlier and (2) Microsoft Interix 6.0 build 10.0.6030.0 allows context-dependent attackers to cause a denial of service (application crash) via a deep directory tree, related to the fts_level structure member, as demonstrated by (a) du, (b) rm, (c) chmod, and (d) chgrp on OpenBSD; and (e) SearchIndexer.exe on Vista Enterprise.
How severe is CVE-2009-0537?: CVE-2009-0537 has a CVSS 2.0 base score of 4.9, rated medium severity.
Is CVE-2009-0537 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-2009-0537?: CVE-2009-0537 primarily affects Microsoft Interix. In total, 26 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-0537?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-0537 published?: CVE-2009-0537 was published on 2009-03-09 and last updated on 2026-06-16.

References

Affected products (26)

cpe:2.3:a:microsoft:interix:6.0:*:10.0.6030.0:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:*:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:2.0:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:2.1:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:2.2:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:2.3:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:2.4:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:2.5:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:2.6:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:2.7:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:2.8:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:2.9:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:3.0:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:3.1:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:3.2:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:3.3:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:3.4:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:3.5:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:3.6:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:3.7:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:3.8:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:3.9:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:4.0:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:4.1:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:4.2:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:4.3:*:*:*:*:*:*:*

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