CVE-2015-7855
MEDIUMCVSS 6.5/10EPSS 31.07%
Last modified
CVE-2015-7855 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. The decodenetnum function in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to cause a denial of service (assertion failure) via a 6 or mode 7 packet containing a long data value.. EPSS estimates a 31.07% chance of exploitation in the next 30 days.
Description
The decodenetnum function in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to cause a denial of service (assertion failure) via a 6 or mode 7 packet containing a long data value.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Ntp | Ntp | >= 4.2.0, < 4.2.8 |
| Ntp | Ntp | >= 4.3.0, < 4.3.77 |
| Ntp | Ntp | 4.2.8 |
| 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 |
| Siemens | Tim 4r-Ie Firmware | All versions |
| Siemens | Tim 4r-Ie Dnp3 Firmware | All versions |
References
- http://support.ntp.org/bin/view/Main/NtpBug2922Patch, Vendor Advisory
- http://www.debian.org/security/2015/dsa-3388Third Party Advisory
- http://www.securityfocus.com/bid/77283Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1033951Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=1274264Issue Tracking, Third Party Advisory, VDB Entry
- https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdfThird Party Advisory
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05270839Third 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
- https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11Third Party Advisory, US Government Resource
- https://www.exploit-db.com/exploits/40840/Exploit, Third Party Advisory, VDB Entry
- http://support.ntp.org/bin/view/Main/NtpBug2922Patch, Vendor Advisory
- http://www.debian.org/security/2015/dsa-3388Third Party Advisory
- http://www.securityfocus.com/bid/77283Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1033951Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=1274264Issue Tracking, Third Party Advisory, VDB Entry
- https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdfThird Party Advisory
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05270839Third 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
- https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11Third Party Advisory, US Government Resource
- https://www.exploit-db.com/exploits/40840/Exploit, Third Party Advisory, VDB Entry
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2015-7855?
The decodenetnum function in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to cause a denial of service (assertion failure) via a 6 or mode 7 packet containing a long data value.
How severe is CVE-2015-7855?
CVE-2015-7855 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 31.07% probability of exploitation in the next 30 days.
How do I fix CVE-2015-7855?
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-2015-7855?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST