How severe is CVE-2009-0161?

CVE-2009-0161 has a CVSS 2.0 base score of 6.4, rated medium severity.

Is CVE-2009-0161 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-0161?

CVE-2009-0161 primarily affects Apple Mac Os X. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-0161?

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

When was CVE-2009-0161 published?

CVE-2009-0161 was published on 2009-05-13 and last updated on 2026-06-16.

CVE-2009-0161

CVE-2009-0161 is a medium-severity vulnerability in Apple Mac Os X with a CVSS 2.0 base score of 6.4. 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-20.

Key facts

Severity: Medium (CVSS 2.0 base score 6.4)
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Apple Mac Os X
Published: 2009-05-13
Last modified: 2026-06-16

Description

The OpenSSL::OCSP module for Ruby in Apple Mac OS X 10.5 before 10.5.7 misinterprets an unspecified invalid response as a successful OCSP certificate validation, which might allow remote attackers to spoof certificate authentication via a revoked certificate.

Frequently asked questions

What is CVE-2009-0161?: The OpenSSL::OCSP module for Ruby in Apple Mac OS X 10.5 before 10.5.7 misinterprets an unspecified invalid response as a successful OCSP certificate validation, which might allow remote attackers to spoof certificate authentication via a revoked certificate.
How severe is CVE-2009-0161?: CVE-2009-0161 has a CVSS 2.0 base score of 6.4, rated medium severity.
Is CVE-2009-0161 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-0161?: CVE-2009-0161 primarily affects Apple Mac Os X. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-0161?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-0161 published?: CVE-2009-0161 was published on 2009-05-13 and last updated on 2026-06-16.

References

Affected products (14)

cpe:2.3:o:apple:mac_os_x:10.5.0:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x:10.5.1:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x:10.5.2:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x:10.5.3:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x:10.5.4:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x:10.5.5:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x:10.5.6:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.4.11:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.5.0:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.5.1:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.5.2:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.5.3:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.5.4:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.5.6:*:*:*:*:*:*:*

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