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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 31.1%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.1
- 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 31.07% probability · 98th percentile
- Public exploits
- 1 in Exploit-DB · verified · first 28 November 2016
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- ntp/ntp · debian/debian linux · netapp/oncommand balance · netapp/oncommand performance manager · netapp/oncommand unified manager · netapp/clustered data ontap · netapp/data ontap · siemens/tim 4r-ie firmware · siemens/tim 4r-ie dnp3 firmware
- Source
- cve@mitre.org
EPSS 31.1% since 4 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
Public exploits (1)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.