CVE-2015-7855
medium
CVSS v3
6.5
CVSS v4 NEW
—
VIR risk
7.5
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.
Predictions
Exploit likelihood
75%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Exploits
Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.
Exploit-DB
OS impact
Debian Mixed 4 releases
| Version | Status | Fixed in |
|---|---|---|
| bullseye | Fixed | 1:4.2.8p4+dfsg-1 |
| 9.0 | Affected | — |
| 8.0 | Affected | — |
| 7.0 | Affected | — |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| ntp | ntp | {"startIncluding":"4.2.0","endExcluding":"4.2.8"} | 4.2.8 |
| ntp | ntp | 4.2.8 | |
| netapp | oncommand_balance | - | |
| netapp | oncommand_performance_manager | - | |
| netapp | oncommand_unified_manager | - | |
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/
- https://security-tracker.debian.org/tracker/CVE-2015-7855
CWEs
CWE-20
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.