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Servers and applications

CVE-2009-0642

ext/openssl/ossl_ocsp.c in Ruby 1.8 and 1.9 does not properly check the return value from the OCSP_basic_verify function, which might allow remote attackers to successfully present an invalid X.509 certificate, possibly involving a revoked certificate.

Severity
Medium 6.8
Published
20 Feb 2009
Last changed
16 Jun 2026
Added to UpHeron
21 Oct 2026
Exploit chance
2.6% in the next 30 daysHigher than 85% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
Improper authentication (CWE-287)
Attack
Over the network · No login needed
Attacker can
Read some data · Change some data · Slow it down
CVSS vector
AV:N/AC:M/Au:N/C:P/I:P/A:P
Sources
NVD

Affected software

SoftwareAffected versions
RubyServers and applications · cpe:a:ruby-lang:ruby
  • Version 1.8
  • Version 1.9

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2009-0642
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2009-0642