openssl: Divide-and-conquer session key recovery in SSLv2
Published Mar 2, 2016
5.9
MEDIUMCVSS 3.0
EPSS 5.40%
Description
The get_client_master_key function in s2_srvr.c in the SSLv2 implementation in OpenSSL before 0.9.8zf, 1.0.0 before 1.0.0r, 1.0.1 before 1.0.1m, and 1.0.2 before 1.0.2a accepts a nonzero CLIENT-MASTER-KEY CLEAR-KEY-LENGTH value for an arbitrary cipher, which allows man-in-the-middle attackers to determine the MASTER-KEY value and decrypt TLS ciphertext data by leveraging a Bleichenbacher RSA padding oracle, a related issue to CVE-2016-0800.
Affected products
No data.
- ≤ 0.9.8ze
- 1.0.0
- 1.0.0
- 1.0.0
- 1.0.0
- 1.0.0
- 1.0.0
- 1.0.0a
- 1.0.0b
- 1.0.0c
- 1.0.0d
- 1.0.0e
- 1.0.0f
- 1.0.0g
- 1.0.0h
- 1.0.0i
- 1.0.0j
- 1.0.0k
- 1.0.0l
- 1.0.0m
- 1.0.0n
- 1.0.0o
- 1.0.0p
- 1.0.0q
- 1.0.1
- 1.0.1
- 1.0.1
- 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
- 1.0.2
- 1.0.2
- 1.0.2
- 1.0.2
No data.
Red Hat Enterprise Linux 4 Extended Lifecycle Support
openssl-0:0.9.7a-43.23.el4
Fixed · RHSA-2016:0306
Red Hat Enterprise Linux 5
openssl-0:0.9.8e-33.el5_11
Fixed · RHSA-2015:0800
Red Hat Enterprise Linux 5.6 Long Life
openssl-0:0.9.8e-12.el5_6.13
Fixed · RHSA-2016:0304
Red Hat Enterprise Linux 5.9 Long Life
openssl-0:0.9.8e-26.el5_9.5
Fixed · RHSA-2016:0304
Red Hat Enterprise Linux 6
openssl-0:1.0.1e-30.el6_6.7
Fixed · RHSA-2015:0715
Red Hat Enterprise Linux 6
openssl098e-0:0.9.8e-20.el6_7.1
Fixed · RHSA-2016:0372
Red Hat Enterprise Linux 6.2 Advanced Update Support
openssl-0:1.0.0-20.el6_2.8
Fixed · RHSA-2016:0303
Red Hat Enterprise Linux 6.4 Advanced Update Support
openssl-0:1.0.0-27.el6_4.5
Fixed · RHSA-2016:0303
Red Hat Enterprise Linux 6.5 Advanced Update Support
openssl-0:1.0.1e-16.el6_5.16
Fixed · RHSA-2016:0303
Red Hat Enterprise Linux 7
openssl-1:1.0.1e-42.ael7b_1.4
Fixed · RHSA-2015:0716
Red Hat Enterprise Linux 7
openssl098e-0:0.9.8e-29.el7_2.3
Fixed · RHSA-2016:0372
Red Hat Storage 2.1
openssl-0:1.0.1e-30.el6_6.7
Fixed · RHSA-2015:0752
Red Hat Enterprise Linux 5
openssl097a
Will not fix
Red Hat JBoss Enterprise Application Platform 6
openssl
Under investigation
Red Hat JBoss Enterprise Web Server 1
openssl
Under investigation
Red Hat JBoss Enterprise Web Server 2
openssl
Under investigation
Red Hat JBoss Enterprise Web Server 3
openssl
Under investigation
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 4 Extended Lifecycle Support | openssl-0:0.9.7a-43.23.el4 | Fixed | RHSA-2016:0306 |
| Red Hat Enterprise Linux 5 | openssl-0:0.9.8e-33.el5_11 | Fixed | RHSA-2015:0800 |
| Red Hat Enterprise Linux 5.6 Long Life | openssl-0:0.9.8e-12.el5_6.13 | Fixed | RHSA-2016:0304 |
| Red Hat Enterprise Linux 5.9 Long Life | openssl-0:0.9.8e-26.el5_9.5 | Fixed | RHSA-2016:0304 |
| Red Hat Enterprise Linux 6 | openssl-0:1.0.1e-30.el6_6.7 | Fixed | RHSA-2015:0715 |
| Red Hat Enterprise Linux 6 | openssl098e-0:0.9.8e-20.el6_7.1 | Fixed | RHSA-2016:0372 |
| Red Hat Enterprise Linux 6.2 Advanced Update Support | openssl-0:1.0.0-20.el6_2.8 | Fixed | RHSA-2016:0303 |
| Red Hat Enterprise Linux 6.4 Advanced Update Support | openssl-0:1.0.0-27.el6_4.5 | Fixed | RHSA-2016:0303 |
| Red Hat Enterprise Linux 6.5 Advanced Update Support | openssl-0:1.0.1e-16.el6_5.16 | Fixed | RHSA-2016:0303 |
| Red Hat Enterprise Linux 7 | openssl-1:1.0.1e-42.ael7b_1.4 | Fixed | RHSA-2015:0716 |
| Red Hat Enterprise Linux 7 | openssl098e-0:0.9.8e-29.el7_2.3 | Fixed | RHSA-2016:0372 |
| Red Hat Storage 2.1 | openssl-0:1.0.1e-30.el6_6.7 | Fixed | RHSA-2015:0752 |
| Red Hat Enterprise Linux 5 | openssl097a | Will not fix | n/a |
| Red Hat JBoss Enterprise Application Platform 6 | openssl | Under investigation | n/a |
| Red Hat JBoss Enterprise Web Server 1 | openssl | Under investigation | n/a |
| Red Hat JBoss Enterprise Web Server 2 | openssl | Under investigation | n/a |
| Red Hat JBoss Enterprise Web Server 3 | openssl | Under investigation | 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.
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
AV:N/AC:M/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
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 (29 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 5.40% (0.05398) | 92.44th | v5 (v2026.06.15) |
| Jun 15, 2026 | 5.40% (0.05398) | 91.62th | v5 (v2026.06.15) |
| Jun 9, 2026 | 3.84% (0.03842) | 88.42th | v4 (v2025.03.14) |
| Mar 25, 2026 | 4.86% (0.04860) | 89.48th | v4 (v2025.03.14) |
| Jan 27, 2026 | 3.84% (0.03837) | 87.86th | v4 (v2025.03.14) |
| Dec 28, 2025 | 4.94% (0.04941) | 89.28th | v4 (v2025.03.14) |
| Dec 27, 2025 | 3.32% (0.03322) | 86.95th | v4 (v2025.03.14) |
| Oct 28, 2025 | 5.05% (0.05046) | 89.26th | v4 (v2025.03.14) |
| Oct 27, 2025 | 3.39% (0.03394) | 86.92th | v4 (v2025.03.14) |
| Oct 1, 2025 | 5.83% (0.05828) | 90.20th | v4 (v2025.03.14) |
| Jul 30, 2025 | 3.39% (0.03394) | 86.94th | v4 (v2025.03.14) |
| Jul 4, 2025 | 5.99% (0.05989) | 90.25th | v4 (v2025.03.14) |
| Jul 1, 2025 | 4.63% (0.04632) | 88.86th | v4 (v2025.03.14) |
| Jun 4, 2025 | 5.99% (0.05989) | 90.19th | v4 (v2025.03.14) |
| Jun 1, 2025 | 4.63% (0.04632) | 88.79th | v4 (v2025.03.14) |
| May 4, 2025 | 5.99% (0.05989) | 90.14th | v4 (v2025.03.14) |
| May 1, 2025 | 4.63% (0.04632) | 88.71th | v4 (v2025.03.14) |
| Mar 30, 2025 | 5.99% (0.05989) | 89.73th | v4 (v2025.03.14) |
| Mar 29, 2025 | 10.86% (0.10863) | 88.92th | v4 (v2025.03.14) |
| Mar 20, 2025 | 5.99% (0.05989) | 89.85th | v4 (v2025.03.14) |
| Mar 17, 2025 | 4.96% (0.04963) | 88.94th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.80% (0.00798) | 82.34th | v3 (v2023.03.01) |
| Apr 16, 2024 | 0.92% (0.00925) | 82.72th | v3 (v2023.03.01) |
| Jun 3, 2023 | 0.92% (0.00925) | 80.72th | v3 (v2023.03.01) |
| Apr 25, 2023 | 0.65% (0.00653) | 76.43th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.46% (0.00461) | 71.48th | v3 (v2023.03.01) |
| Mar 6, 2023 | 4.72% (0.04720) | 89.23th | v2 (v2022.01.01) |
| Apr 1, 2022 | 4.72% (0.04720) | 88.14th | v2 (v2022.01.01) |
| Feb 4, 2022 | 4.72% (0.04720) | 74.52th | v2 (v2022.01.01) |
References (35)
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00001.html vendor-advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00002.html vendor-advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00003.html vendor-advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00004.html vendor-advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00006.html vendor-advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00007.html vendor-advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00009.html vendor-advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00010.html vendor-advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00012.html vendor-advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00017.html vendor-advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00025.html vendor-advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00038.html vendor-advisory
- http://openssl.org/news/secadv/20160301.txt Vendor Advisory
- http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160302-openssl vendor-advisory
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
- http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
- http://www.securityfocus.com/bid/83743 vdb-entry
- http://www.securitytracker.com/id/1035133 vdb-entry
- https://access.redhat.com/security/cve/CVE-2016-0703 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1310811 Issue Tracking
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
- https://drownattack.com
- https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=ae50d8270026edf5b3c7f8aaa0c6677462b33d97
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03741en_us
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05141441
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40168
- https://nvd.nist.gov/vuln/detail/CVE-2016-0703
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:12.openssl.asc vendor-advisory
- https://security.gentoo.org/glsa/201603-15 vendor-advisory
- https://www.arista.com/en/support/advisories-notices/security-advisories/1260-security-advisory-18
- https://www.cve.org/CVERecord?id=CVE-2016-0703
- https://www.openssl.org/news/secadv/20160301.txt
Change history (0)
No recorded changes yet.