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CVE-2016-2181

36
FAUCET Score

CVE-2016-2181 describes a denial-of-service vulnerability in the DTLS Anti-Replay feature of OpenSSL versions prior to 1.1.0, affecting products like OpenSSL and Oracle Linux. This flaw allows remote attackers to cause false-positive packet drops by manipulating epoch and sequence numbers in spoofed DTLS records. With a CVSS score of 7.5 (High), it presents a low-complexity network attack with high availability impact. Despite its severity, there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
1.0.1CPE matchmatch criteria
cpe:2.3:a:openssl:openssl:1.0.1:*:*:*:*:*:*:*
1.0.1aCPE matchmatch criteria
cpe:2.3:a:openssl:openssl:1.0.1a:*:*:*:*:*:*:*
1.0.1bCPE matchmatch criteria
cpe:2.3:a:openssl:openssl:1.0.1b:*:*:*:*:*:*:*
1.0.1cCPE matchmatch criteria
cpe:2.3:a:openssl:openssl:1.0.1c:*:*:*:*:*:*:*
1.0.1dCPE matchmatch criteria
cpe:2.3:a:openssl:openssl:1.0.1d:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/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
3.0

Exploit Intelligence

EPSS Score
22.63%
Probability of exploitation in next 30 days
EPSS Percentile
97.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.2263 is in the 96th percentile among its peer group of 51,466 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 (7)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: openssl-0:1.0.1e-48.el6_8.3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: openssl-1:1.0.1e-51.el7_2.7
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: openssl
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: openssl098e
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: openssl098e
redhatend of lifevia redhat_api
Product: Red Hat JBoss Enterprise Web Server 1Fixed in: openssl
redhatend of lifevia redhat_api
Product: Red Hat JBoss Enterprise Web Server 2Fixed in: openssl

Vendor Advisories (1)

redhatCVE-2016-2181Moderate

openssl: DTLS replay protection bypass allows DoS against DTLS connection

Jul 5, 2016

References

kb.juniper.net / InfoCenter/index
Third Party Advisory
lists.opensuse.org / opensuse-security-announce/2016-09/msg00022.html
lists.opensuse.org / opensuse-security-announce/2016-09/msg00023.html
lists.opensuse.org / opensuse-security-announce/2016-09/msg00024.html
lists.opensuse.org / opensuse-security-announce/2016-09/msg00031.html
lists.opensuse.org / opensuse-security-announce/2016-10/msg00005.html
lists.opensuse.org / opensuse-security-announce/2016-10/msg00011.html
lists.opensuse.org / opensuse-security-announce/2016-10/msg00012.html
lists.opensuse.org / opensuse-security-announce/2016-10/msg00029.html
lists.opensuse.org / opensuse-security-announce/2017-10/msg00010.html
lists.opensuse.org / opensuse-security-announce/2017-10/msg00011.html
lists.opensuse.org / opensuse-security-announce/2018-02/msg00032.html
rhn.redhat.com / errata/RHSA-2016-1940.html
bto.bluecoat.com / security-advisory/sa132
Third Party Advisory
cert-portal.siemens.com / productcert/pdf/ssa-412672.pdf
seclists.org / fulldisclosure/2017/Jul/31
git.openssl.org
kb.pulsesecure.net / articles/Pulse_Security_Advisories/SA40312
Third Party Advisory
kc.mcafee.com / corporate/index
security.freebsd.org / advisories/FreeBSD-SA-16:26.openssl.asc
support.f5.com / csp/article/K59298921
arista.com / en/support/advisories-notices/security-advisories/1749-security-advisory-24
tenable.com / security/tns-2016-16
Third Party Advisory
tenable.com / security/tns-2016-20
tenable.com / security/tns-2016-21
www-01.ibm.com / support/docview.wss
Third Party Advisory
debian.org / security/2016/dsa-3673
huawei.com / en/psirt/security-advisories/huawei-sa-20170322-01-openssl-en
oracle.com / technetwork/security-advisory/cpuapr2018-3678067.html
oracle.com / technetwork/security-advisory/cpujan2018-3236628.html
oracle.com / technetwork/security-advisory/cpujul2017-3236622.html
oracle.com / technetwork/security-advisory/cpuoct2016-2881722.html
Third Party Advisory
oracle.com / technetwork/security-advisory/cpuoct2017-3236626.html
oracle.com / technetwork/topics/security/linuxbulletinoct2016-3090545.html
Third Party Advisory
oracle.com / technetwork/topics/security/ovmbulletinoct2016-3090547.html
Third Party Advisory
securityfocus.com / bid/92982
Third Party AdvisoryVDB Entry
securitytracker.com / id/1036690
splunk.com / view/SP-CAAAPSV
Third Party Advisory
splunk.com / view/SP-CAAAPUE
Third Party Advisory
ubuntu.com / usn/USN-3087-1
ubuntu.com / usn/USN-3087-2