OpenSSL: BN_mod_exp may produce incorrect results on x86_64
Published Dec 6, 2015
7.5
HIGHCVSS 3.1
EPSS 25.14%
Description
The Montgomery squaring implementation in crypto/bn/asm/x86_64-mont5.pl in OpenSSL 1.0.2 before 1.0.2e on the x86_64 platform, as used by the BN_mod_exp function, mishandles carry propagation and produces incorrect output, which makes it easier for remote attackers to obtain sensitive private-key information via an attack against use of a (1) Diffie-Hellman (DH) or (2) Diffie-Hellman Ephemeral (DHE) ciphersuite.
Affected products
No data.
Configuration 1
Configuration 2
Configuration 3
- 12.04
- 14.04
- 15.04
- 15.10
No data.
Red Hat Enterprise Linux 5
openssl
Not affected
Red Hat Enterprise Linux 5
openssl097a
Not affected
Red Hat Enterprise Linux 6
openssl
Not affected
Red Hat Enterprise Linux 7
openssl
Not affected
Red Hat Enterprise Linux 7
openssl098e
Not affected
Red Hat JBoss Enterprise Application Platform 6
openssl
Not affected
Red Hat JBoss Enterprise Web Server 1
openssl
Not affected
Red Hat JBoss Enterprise Web Server 2
openssl
Not affected
Red Hat JBoss Enterprise Web Server 3
openssl
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | openssl | Not affected | n/a |
| Red Hat Enterprise Linux 5 | openssl097a | Not affected | n/a |
| Red Hat Enterprise Linux 6 | openssl | Not affected | n/a |
| Red Hat Enterprise Linux 7 | openssl | Not affected | n/a |
| Red Hat Enterprise Linux 7 | openssl098e | Not affected | n/a |
| Red Hat JBoss Enterprise Application Platform 6 | openssl | Not affected | n/a |
| Red Hat JBoss Enterprise Web Server 1 | openssl | Not affected | n/a |
| Red Hat JBoss Enterprise Web Server 2 | openssl | Not affected | n/a |
| Red Hat JBoss Enterprise Web Server 3 | openssl | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue does not affect the version of OpenSSL as shipped with Red Hat Enterprise Linux 5, 6 and 7.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
No CVSS v3.0 score for this CVE.
AV:N/AC:L/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 1, 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 (42 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 25.14% (0.25137) | 97.87th | v5 (v2026.06.15) |
| Jun 15, 2026 | 25.14% (0.25137) | 97.65th | v5 (v2026.06.15) |
| May 27, 2026 | 27.59% (0.27588) | 96.50th | v4 (v2025.03.14) |
| Apr 19, 2026 | 30.47% (0.30466) | 96.71th | v4 (v2025.03.14) |
| Apr 9, 2026 | 35.17% (0.35175) | 97.03th | v4 (v2025.03.14) |
| Mar 14, 2026 | 23.63% (0.23626) | 95.90th | v4 (v2025.03.14) |
| Mar 8, 2026 | 25.56% (0.25562) | 96.12th | v4 (v2025.03.14) |
| Mar 4, 2026 | 34.36% (0.34358) | 96.91th | v4 (v2025.03.14) |
| Mar 2, 2026 | 36.81% (0.36809) | 97.08th | v4 (v2025.03.14) |
| Feb 19, 2026 | 34.34% (0.34339) | 96.88th | v4 (v2025.03.14) |
| Feb 4, 2026 | 31.40% (0.31402) | 96.65th | v4 (v2025.03.14) |
| Feb 1, 2026 | 33.77% (0.33775) | 96.86th | v4 (v2025.03.14) |
| Jan 4, 2026 | 31.40% (0.31402) | 96.61th | v4 (v2025.03.14) |
| Jan 1, 2026 | 33.77% (0.33775) | 96.83th | v4 (v2025.03.14) |
| Dec 28, 2025 | 31.40% (0.31402) | 96.61th | v4 (v2025.03.14) |
| Dec 27, 2025 | 27.55% (0.27554) | 96.28th | v4 (v2025.03.14) |
| Dec 4, 2025 | 31.40% (0.31402) | 96.58th | v4 (v2025.03.14) |
| Dec 1, 2025 | 34.34% (0.34335) | 96.84th | v4 (v2025.03.14) |
| Nov 30, 2025 | 31.95% (0.31946) | 96.63th | v4 (v2025.03.14) |
| Nov 4, 2025 | 26.94% (0.26939) | 96.14th | v4 (v2025.03.14) |
| Nov 1, 2025 | 28.84% (0.28837) | 96.36th | v4 (v2025.03.14) |
| Oct 28, 2025 | 26.94% (0.26939) | 96.13th | v4 (v2025.03.14) |
| Oct 27, 2025 | 23.41% (0.23408) | 95.72th | v4 (v2025.03.14) |
| Oct 4, 2025 | 26.94% (0.26939) | 96.18th | v4 (v2025.03.14) |
| Oct 1, 2025 | 28.84% (0.28837) | 96.41th | v4 (v2025.03.14) |
| Jul 4, 2025 | 22.64% (0.22636) | 95.58th | v4 (v2025.03.14) |
| Jul 2, 2025 | 24.35% (0.24354) | 95.86th | v4 (v2025.03.14) |
| Jul 1, 2025 | 21.81% (0.21812) | 95.49th | v4 (v2025.03.14) |
| Jun 4, 2025 | 20.21% (0.20214) | 95.19th | v4 (v2025.03.14) |
| Jun 1, 2025 | 21.81% (0.21812) | 95.45th | v4 (v2025.03.14) |
| May 4, 2025 | 20.21% (0.20214) | 95.14th | v4 (v2025.03.14) |
| May 1, 2025 | 21.81% (0.21812) | 95.41th | v4 (v2025.03.14) |
| Mar 30, 2025 | 20.21% (0.20214) | 95.03th | v4 (v2025.03.14) |
| Mar 29, 2025 | 32.04% (0.32037) | 95.01th | v4 (v2025.03.14) |
| Mar 20, 2025 | 20.21% (0.20214) | 95.06th | v4 (v2025.03.14) |
| Mar 17, 2025 | 24.01% (0.24011) | 95.59th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.45% (0.00453) | 76.00th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.45% (0.00453) | 74.44th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.45% (0.00453) | 71.27th | 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) |
References (26)
- http://fortiguard.com/advisory/openssl-advisory-december-2015 Third Party Advisory
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759 Third Party Advisory
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10761 Third Party Advisory
- http://openssl.org/news/secadv/20151203.txt Vendor Advisory
- http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151204-openssl vendor-advisoryThird Party Advisory
- http://www.fortiguard.com/advisory/openssl-advisory-december-2015 Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html PatchThird Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html PatchThird Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html PatchThird Party Advisory
- http://www.securityfocus.com/bid/78705 vdb-entryThird Party AdvisoryVDB Entry
- http://www.securityfocus.com/bid/91787 vdb-entryThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1034294 vdb-entryThird Party AdvisoryVDB Entry
- http://www.slackware.com/security/viewer.php?l=slackware-security&y=2015&m=slackware-security.539966 vendor-advisoryThird Party Advisory
- http://www.slackware.com/security/viewer.php?l=slackware-security&y=2015&m=slackware-security.754583 vendor-advisoryThird Party Advisory
- http://www.ubuntu.com/usn/USN-2830-1 vendor-advisoryThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2015-3193 Vendor Advisory
- https://blog.fuzzing-project.org/31-Fuzzing-Math-miscalculations-in-OpenSSLs-BN_mod_exp-CVE-2015-3193.html Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1288317 Issue TrackingThird Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
- https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=d73cc256c8e256c32ed959456101b73ba9842f72
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05398322 Third Party Advisory
- https://kb.isc.org/article/AA-01438 Third Party Advisory
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40100 Third Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2015-3193
- https://openssl.org/news/secadv/20151203.txt
- https://www.cve.org/CVERecord?id=CVE-2015-3193
Change history (0)
No recorded changes yet.