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CVE-2016-10197

27
FAUCET Score

CVE-2016-10197 is a denial-of-service vulnerability in libevent versions prior to 2.1.6-beta, specifically affecting the search_make_new function in evdns.c, which can be triggered by an attacker providing an empty hostname. Rated with a CVSS score of 7.5 (High), this vulnerability allows for an out-of-bounds read, leading to a denial of service without requiring user interaction or elevated privileges. While the vulnerability has a high severity, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
<= 2.1.5CPE matchmatch criteria
cpe:2.3:a:libevent_project:libevent:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
5.19%
Probability of exploitation in next 30 days
EPSS Percentile
91.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0519 is in the 85th percentile among its peer group of 51,455 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 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 (10)

github_advisorypatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: firefox-0:52.1.0-2.el6_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: thunderbird-0:52.1.0-1.el6_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: firefox-0:52.1.0-2.el7_3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: thunderbird-0:52.1.0-1.el7_3
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: firefox
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: libevent
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: thunderbird
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: libevent
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: libevent

Vendor Advisories (1)

redhatCVE-2016-10197Low

libevent: Out-of-bounds read in search_make_new()

Mar 3, 2016

References

access.redhat.com / errata/RHSA-2017:1104
Third Party Advisory
access.redhat.com / errata/RHSA-2017:1106
Third Party Advisory
access.redhat.com / errata/RHSA-2017:1201
Third Party Advisory
github.com / libevent/libevent/blob/release-2.1.6-beta/ChangeLog
Release NotesThird Party Advisory
github.com / libevent/libevent/commit/ec65c42052d95d2c23d1d837136d1cf1d9ecef9e
PatchThird Party Advisory
github.com / libevent/libevent/issues/332
ExploitIssue TrackingThird Party Advisory
security.gentoo.org / glsa/201705-01
Third Party Advisory
debian.org / security/2017/dsa-3789
Third Party Advisory
openwall.com / lists/oss-security/2017/01/31/17
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2017/02/02/7
Mailing ListThird Party Advisory
securityfocus.com / bid/96014
Third Party AdvisoryVDB Entry
securitytracker.com / id/1038320
Broken LinkThird Party AdvisoryVDB Entry