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CVE-2009-0021

UnknownEPSS 3.17%

Last modified

CVE-2009-0021 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 3.17% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability
3.17%

86.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
NtpNtp<= 4.2.4p4
NtpNtp4.2.0
NtpNtp4.2.2
NtpNtp4.2.4p1
NtpNtp4.2.4p2
NtpNtp4.2.4p3

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2009-0021?
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.
How severe is CVE-2009-0021?
Severity scoring for CVE-2009-0021 is pending analysis. The EPSS model estimates a 3.17% probability of exploitation in the next 30 days.
How do I fix CVE-2009-0021?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2009-0021?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST