HIGH
openssl: DTLS replay protection bypass allows DoS against DTLS connection
Published Sep 16, 2016
7.5
HIGHCVSS 3.0
EPSS 22.63%
Description
The Anti-Replay feature in the DTLS implementation in OpenSSL before 1.1.0 mishandles early use of a new epoch number in conjunction with a large sequence number, which allows remote attackers to cause a denial of service (false-positive packet drops) via spoofed DTLS records, related to rec_layer_d1.c and ssl3_record.c.
Affected products
No data.
Configuration 1
OR
- 1.0.1
- 1.0.1a
- 1.0.1b
- 1.0.1c
- 1.0.1d
- 1.0.1e
- 1.0.1f
- 1.0.1g
- 1.0.1h
- 1.0.1i
- 1.0.1j
- 1.0.1k
- 1.0.1l
- 1.0.1m
- 1.0.1n
- 1.0.1o
- 1.0.1p
- 1.0.1q
- 1.0.1r
- 1.0.1s
- 1.0.1t
- 1.0.2
- 1.0.2a
- 1.0.2b
- 1.0.2c
- 1.0.2d
- 1.0.2e
- 1.0.2f
- 1.0.2g
- 1.0.2h
No data.
Red Hat Enterprise Linux 6
openssl-0:1.0.1e-48.el6_8.3
Fixed · RHSA-2016:1940
Red Hat Enterprise Linux 7
openssl-1:1.0.1e-51.el7_2.7
Fixed · RHSA-2016:1940
Red Hat Enterprise Linux 5
openssl
Will not fix
Red Hat Enterprise Linux 5
openssl097a
Not affected
Red Hat Enterprise Linux 6
openssl098e
Will not fix
Red Hat Enterprise Linux 7
openssl098e
Will not fix
Red Hat JBoss Core Services
openssl
Not affected
Red Hat JBoss Enterprise Application Platform 6
openssl
Not affected
Red Hat JBoss Enterprise Web Server 1
openssl
Will not fix
Red Hat JBoss Enterprise Web Server 2
openssl
Will not fix
Red Hat JBoss Enterprise Web Server 3
openssl
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | openssl-0:1.0.1e-48.el6_8.3 | Fixed | RHSA-2016:1940 |
| Red Hat Enterprise Linux 7 | openssl-1:1.0.1e-51.el7_2.7 | Fixed | RHSA-2016:1940 |
| Red Hat Enterprise Linux 5 | openssl | Will not fix | n/a |
| Red Hat Enterprise Linux 5 | openssl097a | Not affected | n/a |
| Red Hat Enterprise Linux 6 | openssl098e | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | openssl098e | Will not fix | n/a |
| Red Hat JBoss Core Services | openssl | Not affected | n/a |
| Red Hat JBoss Enterprise Application Platform 6 | openssl | Not affected | n/a |
| Red Hat JBoss Enterprise Web Server 1 | openssl | Will not fix | n/a |
| Red Hat JBoss Enterprise Web Server 2 | openssl | Will not fix | n/a |
| Red Hat JBoss Enterprise Web Server 3 | openssl | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
7.5 HIGH NVD
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
1 other source (Red Hat) ▾
5.9 MEDIUM Red Hat
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact None
Availability Impact High
5.0 MEDIUM NVD
AV:N/AC:L/Au:N/C:N/I:N/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
22.63% 0.22634
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.22634
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (47 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 22.63% (0.22634) | 97.66th | v5 (v2026.06.15) |
| Jun 15, 2026 | 22.63% (0.22634) | 97.42th | v5 (v2026.06.15) |
| Apr 21, 2026 | 24.27% (0.24266) | 96.11th | v4 (v2025.03.14) |
| Mar 4, 2026 | 23.03% (0.23026) | 95.80th | v4 (v2025.03.14) |
| Mar 1, 2026 | 8.19% (0.08190) | 92.08th | v4 (v2025.03.14) |
| Feb 4, 2026 | 23.03% (0.23026) | 95.77th | v4 (v2025.03.14) |
| Feb 1, 2026 | 8.19% (0.08190) | 92.02th | v4 (v2025.03.14) |
| Jan 4, 2026 | 23.03% (0.23026) | 95.72th | v4 (v2025.03.14) |
| Jan 1, 2026 | 8.19% (0.08190) | 91.97th | v4 (v2025.03.14) |
| Dec 28, 2025 | 23.03% (0.23026) | 95.73th | v4 (v2025.03.14) |
| Dec 27, 2025 | 18.20% (0.18201) | 95.00th | v4 (v2025.03.14) |
| Dec 4, 2025 | 23.03% (0.23026) | 95.69th | v4 (v2025.03.14) |
| Dec 1, 2025 | 8.19% (0.08190) | 91.90th | v4 (v2025.03.14) |
| Nov 4, 2025 | 23.03% (0.23026) | 95.67th | v4 (v2025.03.14) |
| Nov 1, 2025 | 8.19% (0.08190) | 91.84th | v4 (v2025.03.14) |
| Oct 28, 2025 | 23.03% (0.23026) | 95.66th | v4 (v2025.03.14) |
| Oct 27, 2025 | 18.20% (0.18201) | 94.92th | v4 (v2025.03.14) |
| Oct 4, 2025 | 23.03% (0.23026) | 95.71th | v4 (v2025.03.14) |
| Oct 1, 2025 | 8.19% (0.08190) | 91.90th | v4 (v2025.03.14) |
| Sep 4, 2025 | 18.20% (0.18201) | 94.95th | v4 (v2025.03.14) |
| Sep 1, 2025 | 5.57% (0.05568) | 89.99th | v4 (v2025.03.14) |
| Aug 4, 2025 | 18.20% (0.18201) | 94.92th | v4 (v2025.03.14) |
| Aug 1, 2025 | 5.57% (0.05568) | 89.98th | v4 (v2025.03.14) |
| Jul 30, 2025 | 18.20% (0.18201) | 94.92th | v4 (v2025.03.14) |
| Jul 4, 2025 | 23.03% (0.23026) | 95.64th | v4 (v2025.03.14) |
| Jul 1, 2025 | 8.19% (0.08190) | 91.81th | v4 (v2025.03.14) |
| Jun 4, 2025 | 23.03% (0.23026) | 95.60th | v4 (v2025.03.14) |
| Jun 1, 2025 | 8.19% (0.08190) | 91.78th | v4 (v2025.03.14) |
| May 4, 2025 | 23.03% (0.23026) | 95.55th | v4 (v2025.03.14) |
| May 1, 2025 | 8.19% (0.08190) | 91.76th | v4 (v2025.03.14) |
| Mar 17, 2025 | 23.03% (0.23026) | 95.46th | v4 (v2025.03.14) |
| Mar 1, 2025 | 38.87% (0.38869) | 97.36th | v3 (v2023.03.01) |
| Dec 17, 2024 | 46.58% (0.46581) | 97.52th | v3 (v2023.03.01) |
| Jul 9, 2024 | 59.03% (0.59034) | 97.77th | v3 (v2023.03.01) |
| May 4, 2024 | 60.49% (0.60488) | 97.75th | v3 (v2023.03.01) |
| Mar 31, 2024 | 61.21% (0.61208) | 97.73th | v3 (v2023.03.01) |
| Feb 27, 2024 | 56.84% (0.56835) | 97.60th | v3 (v2023.03.01) |
| Dec 18, 2023 | 49.23% (0.49228) | 97.21th | v3 (v2023.03.01) |
| Nov 8, 2023 | 44.87% (0.44869) | 97.02th | v3 (v2023.03.01) |
| Sep 29, 2023 | 37.11% (0.37115) | 96.70th | v3 (v2023.03.01) |
| Aug 20, 2023 | 33.70% (0.33695) | 96.50th | v3 (v2023.03.01) |
| Jul 8, 2023 | 4.60% (0.04600) | 91.39th | v3 (v2023.03.01) |
| May 30, 2023 | 4.40% (0.04401) | 91.15th | v3 (v2023.03.01) |
| Mar 7, 2023 | 3.15% (0.03154) | 89.59th | v3 (v2023.03.01) |
| Mar 6, 2023 | 7.56% (0.07559) | 92.87th | v2 (v2022.01.01) |
| Apr 1, 2022 | 7.56% (0.07559) | 92.17th | v2 (v2022.01.01) |
| Feb 4, 2022 | 7.56% (0.07559) | 81.11th | v2 (v2022.01.01) |
Weaknesses (2)
References (46)
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759 Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00022.html vendor-advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00023.html vendor-advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00024.html vendor-advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00031.html vendor-advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00005.html vendor-advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00011.html vendor-advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00012.html vendor-advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00029.html vendor-advisory
- http://lists.opensuse.org/opensuse-security-announce/2017-10/msg00010.html vendor-advisory
- http://lists.opensuse.org/opensuse-security-announce/2017-10/msg00011.html vendor-advisory
- http://lists.opensuse.org/opensuse-security-announce/2018-02/msg00032.html vendor-advisory
- http://rhn.redhat.com/errata/RHSA-2016-1940.html vendor-advisory
- http://seclists.org/fulldisclosure/2017/Jul/31 mailing-list
- http://www-01.ibm.com/support/docview.wss?uid=swg21995039 Third Party Advisory
- http://www.debian.org/security/2016/dsa-3673 vendor-advisory
- http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20170322-01-openssl-en
- http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
- http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html
- http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.html Third Party Advisory
- http://www.oracle.com/technetwork/topics/security/ovmbulletinoct2016-3090547.html Third Party Advisory
- http://www.securityfocus.com/bid/92982 vdb-entryThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1036690 vdb-entry
- http://www.splunk.com/view/SP-CAAAPSV Third Party Advisory
- http://www.splunk.com/view/SP-CAAAPUE Third Party Advisory
- http://www.ubuntu.com/usn/USN-3087-1 vendor-advisory
- http://www.ubuntu.com/usn/USN-3087-2 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2016-2181 Vendor Advisory
- https://bto.bluecoat.com/security-advisory/sa132 Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1369113 Issue Tracking
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
- https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=1fb9fdc3027b27d8eb6a1e6a846435b070980770
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40312 Third Party Advisory
- https://kc.mcafee.com/corporate/index?page=content&id=SB10215
- https://nvd.nist.gov/vuln/detail/CVE-2016-2181
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:26.openssl.asc vendor-advisory
- https://support.f5.com/csp/article/K59298921
- https://www.arista.com/en/support/advisories-notices/security-advisories/1749-security-advisory-24
- https://www.cve.org/CVERecord?id=CVE-2016-2181
- https://www.openssl.org/news/secadv/20160922.txt
- https://www.tenable.com/security/tns-2016-16 Third Party Advisory
- https://www.tenable.com/security/tns-2016-20
- https://www.tenable.com/security/tns-2016-21
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner redhat
Published Sep 16, 2016
Updated Aug 5, 2024
Reserved Jan 29, 2016
Link CVE-2016-2181
CISA Vulnrichment
Updated n/a