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Vulnerability record · CVE-2006-2940 · published 28 September 2006

CVE-2006-2940: Openssl vulnerability

OOpenssl · Openssl

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.

7.8 CVSS 2.0 High EPSS 5.0% · top 8.1% CWE-399 · CWE-399
7.8CVSS 2.0 base score
5.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
284References
16 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2008-007.txt.asc
ftp://patches.sgi.com/support/free/security/advisories/20061001-01-P.asc
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
http://marc.info/?l=bugtraq&m=130497311408250&w=2
http://openbsd.org/errata.html#openssl2
http://openvpn.net/changelog.html
http://secunia.com/advisories/22094 Vendor Advisory
http://secunia.com/advisories/22116 Vendor Advisory
http://secunia.com/advisories/22130 Vendor Advisory
http://secunia.com/advisories/22165 Vendor Advisory
http://secunia.com/advisories/22166 Vendor Advisory
http://secunia.com/advisories/22172 Vendor Advisory
http://secunia.com/advisories/22186 Vendor Advisory
http://secunia.com/advisories/22193 Vendor Advisory
http://secunia.com/advisories/22207 Vendor Advisory
http://secunia.com/advisories/22212 Vendor Advisory
http://secunia.com/advisories/22216 Vendor Advisory
http://secunia.com/advisories/22220 Vendor Advisory
http://secunia.com/advisories/22240 Vendor Advisory
http://secunia.com/advisories/22259 Vendor Advisory
http://secunia.com/advisories/22260 Vendor Advisory
http://secunia.com/advisories/22284 Vendor Advisory
http://secunia.com/advisories/22298
http://secunia.com/advisories/22330 Vendor Advisory
http://secunia.com/advisories/22385 Vendor Advisory
http://secunia.com/advisories/22460 Vendor Advisory
http://secunia.com/advisories/22487
http://secunia.com/advisories/22500 Vendor Advisory
http://secunia.com/advisories/22544 Vendor Advisory
http://secunia.com/advisories/22626
http://secunia.com/advisories/22671

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2006-2940), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.