CVE-2006-2940

Severity: high (CVSS 7.8 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 5.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2006-09-28 · updated 2026-06-16
Weakness: CWE-399

Description

OpenSSL 0.9.7 before 0.9.7l, 0.9.8 before 0.9.8d, and earlier versions allows attackers to cause a denial of service (CPU consumption) via parasitic public keys with large (1) "public exponent" or (2) "public modulus" values in X.509 certificates that require extra time to process when using RSA signature verification.

Affected products

OpenSSL: 0.9.1c, 0.9.2b, 0.9.3, 0.9.3a, 0.9.4, 0.9.5 (+41)

References

http://docs.info.apple.com/article.html?artnum=304829
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c01118771
http://issues.rpath.com/browse/RPL-613
http://itrc.hp.com/service/cki/docDisplay.do?docId=c00805100
http://itrc.hp.com/service/cki/docDisplay.do?docId=c00849540
http://kolab.org/security/kolab-vendor-notice-11.txt
http://lists.apple.com/archives/security-announce/2006/Nov/msg00001.html
http://lists.grok.org.uk/pipermail/full-disclosure/2006-September/049715.html
http://lists.vmware.com/pipermail/security-announce/2008/000008.html
http://marc.info/?l=bind-announce&m=116253119512445&w=2

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