CVE-2009-0161

6.4 MEDIUM 2% exploit odds Fix listed

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. Limited direct impact.
Exploit odds: 2.3% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2009-05-13 15:30 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-16 23:04 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 2.3% in the next 30 days (EPSS).
Severity: 6.4 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2009-05-13 15:30 UTC
Last modified: 2026-06-16 23:04 UTC
Exploit probability: 2.3% · EPSS, next 30 days
Weakness: CWE-20 · Improper input validation
Record status: Modified

Affected

Apple Mac Os X 10.5.0
Apple Mac Os X 10.5.1
Apple Mac Os X 10.5.2
Apple Mac Os X 10.5.3
Apple Mac Os X 10.5.4
Apple Mac Os X 10.5.5
Apple Mac Os X 10.5.6
Apple Mac Os X Server 10.4.11

Attack profile CVSS 2.0 · 6.4

Attack vector: Network
Complexity: Low
Authentication: None
Confidentiality: None
Integrity: Partial
Availability: Partial

Raw vector

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

Is it in your code?

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Fix and advisories

References

NVD record · CVE.org record