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CVE-2009-0021

Published Jan 7, 2009 ntp CWE-287

Overview

CVE-2009-0021 is a known-severity vulnerability affecting ntp ntp. It was published on January 7, 2009.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from ntp. Update ntp to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

Vendor Product Versions Status
ntp ntp 0 Affected

References

Ref lists.apple.com/archives/security-announce/2009/May/msg00002.html Ref lists.opensuse.org/opensuse-security-announce/2009-03/msg00000.html Ref lists.opensuse.org/opensuse-security-announce/2009-04/msg00003.html Ref secunia.com/advisories/33406 Ref secunia.com/advisories/33558 Ref secunia.com/advisories/33648 Ref secunia.com/advisories/34642 Ref secunia.com/advisories/35074 Ref slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.531177 Ref support.apple.com/kb/HT3549

Frequently Asked Questions

What is CVE-2009-0021?

CVE-2009-0021 is a known-severity vulnerability affecting ntp ntp. It was published on January 7, 2009.

How severe is CVE-2009-0021?

CVSS score information is not yet available for this vulnerability. Check back as the CVE record is updated by NVD analysts.

How do I fix or remediate CVE-2009-0021?

Check the references section for vendor advisories and patches from ntp. Update ntp to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2009-0021?

CyberStrike's AI-powered security agents can automatically detect CVE-2009-0021 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.

How CyberStrike Helps

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HackBrowser

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