Unrated severityNVD Advisory· Published Jan 7, 2009· Updated Jun 16, 2026
CVE-2009-0021
CVE-2009-0021
Description
NTP 4.2.4 before 4.2.4p5 and 4.2.5 before 4.2.5p150 does not properly check the return value from the OpenSSL EVP_VerifyFinal function, which allows remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature for DSA and ECDSA keys, a similar vulnerability to CVE-2008-5077.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
7cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*+ 6 more
- cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*range: <=4.2.4p4
- cpe:2.3:a:ntp:ntp:4.2.0:*:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.2:*:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.4p1:*:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.4p2:*:*:*:*:*:*:*
- cpe:2.3:a:ntp:ntp:4.2.4p3:*:*:*:*:*:*:*
- (no CPE)range: <4.2.4p5, <4.2.5p150
Patches
Vulnerability mechanics
References
19- secunia.com/advisories/33406nvdVendor Advisory
- secunia.com/advisories/33558nvdVendor Advisory
- secunia.com/advisories/33648nvdVendor Advisory
- secunia.com/advisories/34642nvdVendor Advisory
- secunia.com/advisories/35074nvdVendor Advisory
- www.vupen.com/english/advisories/2009/0042nvdVendor Advisory
- www.vupen.com/english/advisories/2009/1297nvdVendor Advisory
- www.us-cert.gov/cas/techalerts/TA09-133A.htmlnvdUS Government Resource
- lists.apple.com/archives/security-announce/2009/May/msg00002.htmlnvd
- lists.opensuse.org/opensuse-security-announce/2009-03/msg00000.htmlnvd
- lists.opensuse.org/opensuse-security-announce/2009-04/msg00003.htmlnvd
- slackware.com/security/viewer.phpnvd
- support.apple.com/kb/HT3549nvd
- www.ocert.org/advisories/ocert-2008-016.htmlnvd
- www.redhat.com/support/errata/RHSA-2009-0046.htmlnvd
- www.securityfocus.com/archive/1/499827/100/0/threadednvd
- www.securitytracker.com/idnvd
- lists.ntp.org/pipermail/announce/2009-January/000055.htmlnvd
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10035nvd
News mentions
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