CVE-2015-7871

Description

Crypto-NAK packets in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to bypass authentication.

Category

9.8
CVSS
Severity: Critical
CVSS 3.1 •
CVSS 2.0 •
EPSS 84.00% Top 5%
Vendor Advisory debian.org Vendor Advisory gentoo.org Vendor Advisory gentoo.org Vendor Advisory ntp.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://support.ntp.org/bin/view/Main/NtpBug2941 vendor advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1274265 third party advisory vdb entry issue tracking
http://www.securitytracker.com/id/1033951 third party advisory vdb entry
http://www.debian.org/security/2015/dsa-3388 third party advisory vendor advisory
http://www.securityfocus.com/bid/77287 third party advisory vdb entry
https://security.gentoo.org/glsa/201604-03 vendor advisory third party advisory vdb entry
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05270839 third party advisory vdb entry
https://security.gentoo.org/glsa/201607-15 vendor advisory third party advisory vdb entry
https://security.netapp.com/advisory/ntap-20171004-0001/ third party advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf

Frequently Asked Questions

What is the severity of CVE-2015-7871?
CVE-2015-7871 has been scored as a critical severity vulnerability.
How to fix CVE-2015-7871?
To fix CVE-2015-7871, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2015-7871 being actively exploited in the wild?
It is possible that CVE-2015-7871 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~84% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.