CVE-2015-7855

critical-risk
Published 2017-08-07

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.

Do I need to act?

!
60.1% chance of exploitation in next 30 days
EPSS score — higher than 40% of all CVEs
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
!
1 public exploit available
40840
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.5/10 Medium
NETWORK / LOW complexity

Affected Products (20)

Ntp
Ntp
Ntp
Ntp
Ntp
Ntp
Ntp
Ntp
Ntp
Ntp
Ntp
Ntp
Ntp

Affected Vendors

Debian Siemens Netapp Ntp

References (22)

Patch http://support.ntp.org/bin/view/Main/NtpBug2922
Third Party Advisory http://www.debian.org/security/2015/dsa-3388
Third Party Advisory http://www.securityfocus.com/bid/77283
Third Party Advisory http://www.securitytracker.com/id/1033951
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1274264
Third Party Advisory https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf
Third Party Advisory https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c...
Third Party Advisory https://security.gentoo.org/glsa/201607-15
Third Party Advisory https://security.netapp.com/advisory/ntap-20171004-0001/
Third Party Advisory https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11
Exploit https://www.exploit-db.com/exploits/40840/
Patch http://support.ntp.org/bin/view/Main/NtpBug2922
Third Party Advisory http://www.debian.org/security/2015/dsa-3388
Third Party Advisory http://www.securityfocus.com/bid/77283
Third Party Advisory http://www.securitytracker.com/id/1033951
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1274264
Third Party Advisory https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf
Third Party Advisory https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c...
Third Party Advisory https://security.gentoo.org/glsa/201607-15
Third Party Advisory https://security.netapp.com/advisory/ntap-20171004-0001/
and 2 more references
72
/ 100
critical-risk
Severity 24/34 · High
Exploitability 26/34 · High
Exposure 22/34 · High