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CVE-2009-0653

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.

Severity
High 7.5
Published
20 Feb 2009
Last changed
16 Jun 2026
Added to UpHeron
21 Oct 2026
Exploit chance
1.1% in the next 30 daysHigher than 67% 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:L/Au:N/C:P/I:P/A:P
Sources
NVD

Affected software

SoftwareAffected versions
OpenSSLServers and applications · cpe:a:openssl:openssl
  • Version 0.9.6

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2009-0653
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2009-0653