CVE-2015-7871
CRITICALCVSS 9.8/10EPSS 81.76%
Last modified
CVE-2015-7871 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 81.76% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Ntp | Ntp | >= 4.2.6, < 4.2.8 | — |
| Ntp | Ntp | >= 4.3.0, < 4.3.77 | — |
| Ntp | Ntp | 4.2.5 | P186 |
| Ntp | Ntp | 4.2.8 | P1 |
| Debian | Debian Linux | 7.0 | — |
| Debian | Debian Linux | 8.0 | — |
| Debian | Debian Linux | 9.0 | — |
| Netapp | Oncommand Balance | All versions | — |
| Netapp | Oncommand Performance Manager | All versions | — |
| Netapp | Oncommand Unified Manager | All versions | — |
| Netapp | Clustered Data Ontap | All versions | — |
| Netapp | Data Ontap | All versions | — |
References
- http://support.ntp.org/bin/view/Main/NtpBug2941Vendor Advisory
- http://www.debian.org/security/2015/dsa-3388Third Party Advisory
- http://www.securityfocus.com/bid/77287Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1033951Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=1274265Issue Tracking, Third Party Advisory, VDB Entry
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05270839Third Party Advisory, VDB Entry
- https://security.gentoo.org/glsa/201604-03Third Party Advisory, VDB Entry
- https://security.gentoo.org/glsa/201607-15Third Party Advisory, VDB Entry
- https://security.netapp.com/advisory/ntap-20171004-0001/Third Party Advisory
- http://support.ntp.org/bin/view/Main/NtpBug2941Vendor Advisory
- http://www.debian.org/security/2015/dsa-3388Third Party Advisory
- http://www.securityfocus.com/bid/77287Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1033951Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=1274265Issue Tracking, Third Party Advisory, VDB Entry
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05270839Third Party Advisory, VDB Entry
- https://security.gentoo.org/glsa/201604-03Third Party Advisory, VDB Entry
- https://security.gentoo.org/glsa/201607-15Third Party Advisory, VDB Entry
- https://security.netapp.com/advisory/ntap-20171004-0001/Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2015-7871?
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.
How severe is CVE-2015-7871?
CVE-2015-7871 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 81.76% probability of exploitation in the next 30 days.
How do I fix CVE-2015-7871?
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.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2015-7871?
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Scan your code nowSource: NVD / NIST