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CVE-2015-1799

14
FAUCET Score

CVE-2015-1799 describes a denial-of-service vulnerability in the symmetric-key feature of ntpd in NTP versions 3.x and 4.x before 4.2.8p2. An attacker can exploit this by spoofing a peer's IP address and sending specially crafted invalid packets, causing synchronization loss. This vulnerability has a CVSS score of 4.3, indicating a medium severity, and requires adjacent network access with medium attack complexity to achieve partial integrity and availability impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.2.7p444CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.3MEDIUM

AV:A/AC:M/Au:N/C:N/I:P/A:P

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
ADJACENT_NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
5.5
Impact Score
4.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
0.90%
Probability of exploitation in next 30 days
EPSS Percentile
56.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0090 is in the 95th percentile among its peer group of 1,749 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, 0.0 Bluesky, 0.0 Mastodon, and 0.0 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

Patch Available

Vendor Patches (3)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: ntp-0:4.2.6p5-5.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: ntp-0:4.2.6p5-22.el7
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: ntp

Vendor Advisories (1)

redhatCVE-2015-1799Moderate

ntp: authentication doesn't protect symmetric associations against DoS attacks

Apr 7, 2015

References

bugs.ntp.org / show_bug.cgi
listengine.tuxfamily.org / chrony.tuxfamily.org/chrony-announce/2015/04/msg00002.html
lists.apple.com / archives/security-announce/2015/Jun/msg00002.html
lists.fedoraproject.org / pipermail/package-announce/2015-April/155863.html
lists.fedoraproject.org / pipermail/package-announce/2015-April/155864.html
lists.opensuse.org / opensuse-updates/2015-04/msg00052.html
marc.info
marc.info
rhn.redhat.com / errata/RHSA-2015-1459.html
kc.mcafee.com / corporate/index
security.gentoo.org / glsa/201509-01
support.apple.com / kb/HT204942
support.ntp.org / bin/view/Main/SecurityNotice
Vendor Advisory
tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-20150408-ntpd
tools.cisco.com / security/center/viewAlert.x
debian.org / security/2015/dsa-3222
debian.org / security/2015/dsa-3223
kb.cert.org / vuls/id/374268
Third Party AdvisoryUS Government Resource
mandriva.com / security/advisories
oracle.com / technetwork/topics/security/bulletinapr2015-2511959.html
oracle.com / technetwork/topics/security/linuxbulletinoct2015-2719645.html
securityfocus.com / bid/73950
securitytracker.com / id/1032031
ubuntu.com / usn/USN-2567-1