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CVE-2016-7796

21
FAUCET Score

CVE-2016-7796 describes a denial-of-service vulnerability in the manager_dispatch_notify_fd function of systemd, affecting products like Novell and Red Hat. A local attacker can trigger a system hang by sending a zero-length message over a notify socket, disabling the notification handler. This vulnerability has a CVSS score of 5.5 (Medium), indicating a low attack complexity and requiring local user privileges, with a high impact on availability. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
209CPE matchmatch criteria
cpe:2.3:a:systemd_project:systemd:209:*:*:*:*:*:*:*
213CPE matchmatch criteria
cpe:2.3:a:systemd_project:systemd:213:*:*:*:*:*:*:*
214CPE matchmatch criteria
cpe:2.3:a:systemd_project:systemd:214:*:*:*:*:*:*:*
229CPE matchmatch criteria
cpe:2.3:a:systemd_project:systemd:229:*:*:*:*:*:*:*
12.0CPE matchmatch criteria
cpe:2.3:a:novell:suse_linux_enterprise_software_development_kit:12.0:sp1:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.5MEDIUM

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.85%
Probability of exploitation in next 30 days
EPSS Percentile
54.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0086 is in the 96th percentile among its peer group of 15,938 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 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)

github_advisorypatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: systemd-0:219-19.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.1 Extended Update SupportFixed in: systemd-0:208-20.el7_1.9
View patch

Vendor Advisories (1)

redhatCVE-2016-7796Moderate

systemd: freeze when PID 1 receives a zero-length message over notify socket

Sep 28, 2016

References

lists.opensuse.org / opensuse-security-announce/2016-10/msg00015.html
Third Party Advisory
lists.opensuse.org / opensuse-security-announce/2016-10/msg00016.html
Third Party Advisory
rhn.redhat.com / errata/RHSA-2017-0003.html
bugzilla.redhat.com / show_bug.cgi
Issue TrackingThird Party AdvisoryVDB Entry
github.com / systemd/systemd/issues/4234
ExploitPatchVendor Advisory
rhn.redhat.com / errata/RHBA-2015-2092.html
Third Party Advisory
agwa.name / blog/post/how_to_crash_systemd_in_one_tweet
ExploitTechnical DescriptionThird Party Advisory
openwall.com / lists/oss-security/2016/09/30/1
Third Party Advisory
securityfocus.com / bid/93250
Third Party Advisory
securitytracker.com / id/1037320