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CVE-2009-0161

18
FAUCET Score

CVE-2009-0161 describes a vulnerability in the OpenSSL::OCSP module for Ruby in Apple Mac OS X 10.5 before 10.5.7, where an invalid OCSP response is incorrectly interpreted as a successful certificate validation. This flaw could allow remote attackers to spoof certificate authentication using revoked certificates, impacting the integrity and availability of affected systems. With a CVSS score of 6.4 (AV:N/AC:L/Au:N/C:N/I:P/A:P), it represents a medium-severity vulnerability that can be exploited remotely with low complexity, leading to partial integrity and availability impacts. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
10.5.0CPE matchmatch criteria
cpe:2.3:o:apple:mac_os_x:10.5.0:*:*:*:*:*:*:*
10.5.1CPE matchmatch criteria
cpe:2.3:o:apple:mac_os_x:10.5.1:*:*:*:*:*:*:*
10.5.2CPE matchmatch criteria
cpe:2.3:o:apple:mac_os_x:10.5.2:*:*:*:*:*:*:*
10.5.3CPE matchmatch criteria
cpe:2.3:o:apple:mac_os_x:10.5.3:*:*:*:*:*:*:*
10.5.4CPE matchmatch criteria
cpe:2.3:o:apple:mac_os_x:10.5.4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

6.4MEDIUM

AV:N/AC:L/Au:N/C:N/I:P/A:P

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
4.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.29%
Probability of exploitation in next 30 days
EPSS Percentile
81.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0229 is in the 72nd percentile among its peer group of 23,705 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

applepatch availablevia nvd_reference
View patch

References

lists.apple.com / archives/security-announce/2009/May/msg00002.html
PatchVendor Advisory
secunia.com / advisories/35074
exchange.xforce.ibmcloud.com / vulnerabilities/50592
support.apple.com / kb/HT3549
PatchVendor Advisory
securityfocus.com / bid/34926
us-cert.gov / cas/techalerts/TA09-133A.html
US Government Resource
vupen.com / english/advisories/2009/1297