What’s Vulnerable › Vulnerabilities

CVE-2009-0653

• Severity: high (CVSS 7.5 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2009-02-20 · updated 2026-06-16
• Weakness: CWE-287

Description

OpenSSL, probably 0.9.6, does not verify the Basic Constraints for an intermediate CA-signed certificate, which allows remote attackers to spoof the certificates of trusted sites via a man-in-the-middle attack, a related issue to CVE-2002-0970.

Affected products

• OpenSSL: 0.9.6

References

• http://www.blackhat.com/html/bh-dc-09/bh-dc-09-speakers.html#Marlinspike
• https://www.blackhat.com/presentations/bh-dc-09/Marlinspike/BlackHat-DC-09-Marlinspike-Defeating-SSL.pdf
• http://www.blackhat.com/html/bh-dc-09/bh-dc-09-speakers.html#Marlinspike
• https://www.blackhat.com/presentations/bh-dc-09/Marlinspike/BlackHat-DC-09-Marlinspike-Defeating-SSL.pdf

Get alerted when CVE-2009-0653 or the next vulnerability affects your stack