The decodenetnum function in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77…
Priority MEDIUM 53CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
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.
Why it matters now
EPSS 0.31068 98th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA and NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 30
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:* | 4.2.0 to before 4.2.8; 4.3.0 to before 4.3.77 | Vulnerable | NTP Project |
| cpe:2.3:a:ntp:ntp:4.2.8:-:*:*:*:*:*:* | 4.2.8 | Vulnerable | NTP Project |
| cpe:2.3:a:ntp:ntp:4.2.8:p1:*:*:*:*:*:* | 4.2.8 p1 | Vulnerable | NTP Project |
| cpe:2.3:a:ntp:ntp:4.2.8:p1-beta1:*:*:*:*:*:* | 4.2.8 p1-beta1 | Vulnerable | NTP Project |
| cpe:2.3:a:ntp:ntp:4.2.8:p1-beta2:*:*:*:*:*:* | 4.2.8 p1-beta2 | Vulnerable | NTP Project |
| cpe:2.3:a:ntp:ntp:4.2.8:p1-beta3:*:*:*:*:*:* | 4.2.8 p1-beta3 | Vulnerable | NTP Project |
| cpe:2.3:a:ntp:ntp:4.2.8:p1-beta4:*:*:*:*:*:* | 4.2.8 p1-beta4 | Vulnerable | NTP Project |
| cpe:2.3:a:ntp:ntp:4.2.8:p1-beta5:*:*:*:*:*:* | 4.2.8 p1-beta5 | Vulnerable | NTP Project |
| cpe:2.3:a:ntp:ntp:4.2.8:p1-rc1:*:*:*:*:*:* | 4.2.8 p1-rc1 | Vulnerable | NTP Project |
| cpe:2.3:a:ntp:ntp:4.2.8:p1-rc2:*:*:*:*:*:* | 4.2.8 p1-rc2 | Vulnerable | NTP Project |
- cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:* Versions 4.2.0 to before 4.2.8; 4.3.0 to before 4.3.77 Vulnerable ·NTP Project
- cpe:2.3:a:ntp:ntp:4.2.8:-:*:*:*:*:*:* Versions 4.2.8 Vulnerable ·NTP Project
- cpe:2.3:a:ntp:ntp:4.2.8:p1:*:*:*:*:*:* Versions 4.2.8 p1 Vulnerable ·NTP Project
- cpe:2.3:a:ntp:ntp:4.2.8:p1-beta1:*:*:*:*:*:* Versions 4.2.8 p1-beta1 Vulnerable ·NTP Project
- cpe:2.3:a:ntp:ntp:4.2.8:p1-beta2:*:*:*:*:*:* Versions 4.2.8 p1-beta2 Vulnerable ·NTP Project
- cpe:2.3:a:ntp:ntp:4.2.8:p1-beta3:*:*:*:*:*:* Versions 4.2.8 p1-beta3 Vulnerable ·NTP Project
- cpe:2.3:a:ntp:ntp:4.2.8:p1-beta4:*:*:*:*:*:* Versions 4.2.8 p1-beta4 Vulnerable ·NTP Project
- cpe:2.3:a:ntp:ntp:4.2.8:p1-beta5:*:*:*:*:*:* Versions 4.2.8 p1-beta5 Vulnerable ·NTP Project
- cpe:2.3:a:ntp:ntp:4.2.8:p1-rc1:*:*:*:*:*:* Versions 4.2.8 p1-rc1 Vulnerable ·NTP Project
- cpe:2.3:a:ntp:ntp:4.2.8:p1-rc2:*:*:*:*:*:* Versions 4.2.8 p1-rc2 Vulnerable ·NTP Project
Show 20 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:ntp:ntp:4.2.8:p2:*:*:*:*:*:* | 4.2.8 p2 | Vulnerable | NTP Project |
| cpe:2.3:a:ntp:ntp:4.2.8:p2-rc1:*:*:*:*:*:* | 4.2.8 p2-rc1 | Vulnerable | NTP Project |
| cpe:2.3:a:ntp:ntp:4.2.8:p2-rc2:*:*:*:*:*:* | 4.2.8 p2-rc2 | Vulnerable | NTP Project |
| cpe:2.3:a:ntp:ntp:4.2.8:p2-rc3:*:*:*:*:*:* | 4.2.8 p2-rc3 | Vulnerable | NTP Project |
| cpe:2.3:a:ntp:ntp:4.2.8:p3:*:*:*:*:*:* | 4.2.8 p3 | Vulnerable | NTP Project |
| cpe:2.3:a:ntp:ntp:4.2.8:p3-rc1:*:*:*:*:*:* | 4.2.8 p3-rc1 | Vulnerable | NTP Project |
| cpe:2.3:a:ntp:ntp:4.2.8:p3-rc2:*:*:*:*:*:* | 4.2.8 p3-rc2 | Vulnerable | NTP Project |
| cpe:2.3:a:ntp:ntp:4.2.8:p3-rc3:*:*:*:*:*:* | 4.2.8 p3-rc3 | Vulnerable | NTP Project |
| cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Debian |
| cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* | 8.0 | Vulnerable | Debian |
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Debian |
| cpe:2.3:a:netapp:oncommand_balance:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:netapp:oncommand_performance_manager:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:netapp:oncommand_unified_manager:-:*:*:*:*:clustered_data_ontap:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:o:netapp:clustered_data_ontap:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:o:netapp:data_ontap:-:*:*:*:*:7-mode:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:o:siemens:tim_4r-ie_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Siemens |
| cpe:2.3:h:siemens:tim_4r-ie:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:tim_4r-ie_dnp3_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Siemens |
| cpe:2.3:h:siemens:tim_4r-ie_dnp3:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
- cpe:2.3:a:ntp:ntp:4.2.8:p2:*:*:*:*:*:* Versions 4.2.8 p2 Vulnerable ·NTP Project
- cpe:2.3:a:ntp:ntp:4.2.8:p2-rc1:*:*:*:*:*:* Versions 4.2.8 p2-rc1 Vulnerable ·NTP Project
- cpe:2.3:a:ntp:ntp:4.2.8:p2-rc2:*:*:*:*:*:* Versions 4.2.8 p2-rc2 Vulnerable ·NTP Project
- cpe:2.3:a:ntp:ntp:4.2.8:p2-rc3:*:*:*:*:*:* Versions 4.2.8 p2-rc3 Vulnerable ·NTP Project
- cpe:2.3:a:ntp:ntp:4.2.8:p3:*:*:*:*:*:* Versions 4.2.8 p3 Vulnerable ·NTP Project
- cpe:2.3:a:ntp:ntp:4.2.8:p3-rc1:*:*:*:*:*:* Versions 4.2.8 p3-rc1 Vulnerable ·NTP Project
- cpe:2.3:a:ntp:ntp:4.2.8:p3-rc2:*:*:*:*:*:* Versions 4.2.8 p3-rc2 Vulnerable ·NTP Project
- cpe:2.3:a:ntp:ntp:4.2.8:p3-rc3:*:*:*:*:*:* Versions 4.2.8 p3-rc3 Vulnerable ·NTP Project
- cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Debian
- cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
- cpe:2.3:a:netapp:oncommand_balance:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:netapp:oncommand_performance_manager:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:netapp:oncommand_unified_manager:-:*:*:*:*:clustered_data_ontap:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:o:netapp:clustered_data_ontap:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:o:netapp:data_ontap:-:*:*:*:*:7-mode:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:o:siemens:tim_4r-ie_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Siemens
- cpe:2.3:h:siemens:tim_4r-ie:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:tim_4r-ie_dnp3_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Siemens
- cpe:2.3:h:siemens:tim_4r-ie_dnp3:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
Not affected: 3 products
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2015-7855
- 2026-10-03 Alias added: GHSA-wmrv-mc39-vj78
References
Exploit 1
Advisory 7
- DSA-3388
- https://bugzilla.redhat.com/show_bug.cgi?id=1274264
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05270839
- GLSA-201607-15
- https://security.netapp.com/advisory/ntap-20171004-0001/
- https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf
- https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11
Sources
- CVE-2015-7855 · CVE Program
- CVE-2015-7855 · NVD
- FIRST EPSS
- GHSA-wmrv-mc39-vj78 · GitHub Advisory Database · CC BY 4.0
- CVE-2015-7855 · Red Hat security data · CC BY 4.0
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