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CVE-2015-7849

29
FAUCET Score

CVE-2015-7849 is a use-after-free vulnerability in NTP versions 4.2.x before 4.2.8p4 and 4.3.x before 4.3.77, affecting products like NetApp and NTP itself. This flaw allows remote authenticated attackers to potentially execute arbitrary code or cause a denial of service (crash) through specially crafted packets. With a CVSS score of 8.8 (High), it presents a significant risk due to its low attack complexity and high impact on confidentiality, integrity, and availability. Despite its severity, there is no evidence of active exploitation, public exploit code (e.g., Metasploit, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
>= 4.2.0, < 4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*
>= 4.3.0, < 4.3.77CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*
4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.2.8:-:*:*:*:*:*:*
4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.2.8:p1:*:*:*:*:*:*
4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.2.8:p1-beta1:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
16.85%
Probability of exploitation in next 30 days
EPSS Percentile
96.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.1685 is in the 96th percentile among its peer group of 17,822 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2015-7849Moderate

ntp: trusted keys memory corruption vulnerability

Oct 21, 2015

References

bugzilla.redhat.com / show_bug.cgi
Issue TrackingThird Party AdvisoryVDB Entry
security.gentoo.org / glsa/201607-15
Third Party AdvisoryVDB Entry
security.netapp.com / advisory/ntap-20171004-0001
Third Party Advisory
support.ntp.org / bin/view/Main/NtpBug2916
PatchVendor Advisory
securityfocus.com / bid/77276
Third Party AdvisoryVDB Entry
securitytracker.com / id/1033951
Third Party AdvisoryVDB Entry