CVE-2015-7855 EXPLOIT
6.5
MEDIUM · CVSS 3.1 · EPSS 31.1% (pctl 98)
Patch early
A public exploit exists.
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.
Scoring
| CVSS | 6.5 (MEDIUM, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| EPSS | 31.07% — more likely to be exploited than 98% of all CVEs |
| Weakness | CWE-20 |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2017-08-07 |
| Last modified | 2026-06-17 |
Affected (11)
| Vendor | Product |
|---|---|
| debian | debian linux |
| netapp | clustered data ontap |
| netapp | data ontap |
| netapp | oncommand balance |
| netapp | oncommand performance manager |
| netapp | oncommand unified manager |
| ntp | ntp |
| siemens | tim 4r-ie |
| siemens | tim 4r-ie dnp3 |
| siemens | tim 4r-ie dnp3 firmware |
| siemens | tim 4r-ie firmware |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | NTP 4.2.8p3 - Denial of Service | 2016-11-28 |
References
- http://support.ntp.org/bin/view/Main/NtpBug2922
- http://www.debian.org/security/2015/dsa-3388
- http://www.securityfocus.com/bid/77283
- http://www.securitytracker.com/id/1033951
- https://bugzilla.redhat.com/show_bug.cgi?id=1274264
- https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05270839
- https://security.gentoo.org/glsa/201607-15
- https://security.netapp.com/advisory/ntap-20171004-0001/
- https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11
- https://www.exploit-db.com/exploits/40840/
- http://support.ntp.org/bin/view/Main/NtpBug2922
- http://www.debian.org/security/2015/dsa-3388
- http://www.securityfocus.com/bid/77283
- http://www.securitytracker.com/id/1033951
- https://bugzilla.redhat.com/show_bug.cgi?id=1274264
- https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05270839
- https://security.gentoo.org/glsa/201607-15
- https://security.netapp.com/advisory/ntap-20171004-0001/
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