Incorrect CRYPTO_memcmp on HP-UX PA-RISC
Published Mar 27, 2018
5.9
MEDIUMCVSS 3.0
EPSS 8.28%
Description
Because of an implementation bug the PA-RISC CRYPTO_memcmp function is effectively reduced to only comparing the least significant bit of each byte. This allows an attacker to forge messages that would be considered as authenticated in an amount of tries lower than that guaranteed by the security claims of the scheme. The module can only be compiled by the HP-UX assembler, so that only HP-UX PA-RISC targets are affected. Fixed in OpenSSL 1.1.0h (Affected 1.1.0-1.1.0g).
Affected products
-
- Version Fixed in OpenSSL 1.1.0h (Affected 1.1.0-1.1.0g)StatusaffectedConstraints-
- Version
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 6
openssl098e
Not affected
Red Hat Enterprise Linux 7
OVMF
Not affected
Red Hat Enterprise Linux 7
openssl
Not affected
Red Hat Enterprise Linux 7
openssl098e
Not affected
Red Hat Enterprise Linux 8
openssl
Not affected
Red Hat JBoss Core Services
openssl
Not affected
Red Hat JBoss Enterprise Application Platform 5
openssl
Not affected
Red Hat JBoss Enterprise Application Platform 6
openssl
Not affected
Red Hat JBoss Enterprise Web Server 2
openssl
Not affected
Red Hat JBoss 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 6 | openssl098e | Not affected | n/a |
| Red Hat Enterprise Linux 7 | OVMF | 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 Enterprise Linux 8 | openssl | Not affected | n/a |
| Red Hat JBoss Core Services | openssl | Not affected | n/a |
| Red Hat JBoss Enterprise Application Platform 5 | openssl | Not affected | n/a |
| Red Hat JBoss Enterprise Application Platform 6 | openssl | Not affected | n/a |
| Red Hat JBoss Enterprise Web Server 2 | openssl | Not affected | n/a |
| Red Hat JBoss Web Server 3 | openssl | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This flaw only affects the openssl code which is compiled by the HP-UX assembler, so that only HP-UX PA-RISC arches are affected. Red Hat Enterprise Linux does not support this architecture, and therefore is not affected.
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:N/I:H/A:N
1 other source (Red Hat) ▾
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
AV:N/AC:M/Au:N/C:N/I:P/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
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (26 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 8.28% (0.08281) | 94.75th | v5 (v2026.06.15) |
| Jun 15, 2026 | 8.64% (0.08638) | 94.39th | v5 (v2026.06.15) |
| Mar 22, 2026 | 2.23% (0.02235) | 84.38th | v4 (v2025.03.14) |
| Dec 27, 2025 | 1.10% (0.01096) | 77.55th | v4 (v2025.03.14) |
| Oct 28, 2025 | 2.72% (0.02720) | 85.39th | v4 (v2025.03.14) |
| Oct 27, 2025 | 1.26% (0.01255) | 78.74th | v4 (v2025.03.14) |
| Oct 1, 2025 | 2.72% (0.02720) | 85.45th | v4 (v2025.03.14) |
| Jul 10, 2025 | 1.05% (0.01047) | 76.57th | v4 (v2025.03.14) |
| Mar 30, 2025 | 2.23% (0.02235) | 83.05th | v4 (v2025.03.14) |
| Mar 29, 2025 | 5.68% (0.05681) | 83.59th | v4 (v2025.03.14) |
| Mar 17, 2025 | 2.23% (0.02235) | 83.38th | v4 (v2025.03.14) |
| Dec 12, 2024 | 1.04% (0.01044) | 84.64th | v3 (v2023.03.01) |
| Jun 30, 2024 | 1.04% (0.01044) | 84.07th | v3 (v2023.03.01) |
| Nov 8, 2023 | 1.45% (0.01454) | 85.18th | v3 (v2023.03.01) |
| Sep 27, 2023 | 1.18% (0.01181) | 83.42th | v3 (v2023.03.01) |
| Aug 18, 2023 | 1.14% (0.01141) | 82.93th | v3 (v2023.03.01) |
| Jul 8, 2023 | 1.25% (0.01254) | 83.69th | v3 (v2023.03.01) |
| Mar 21, 2023 | 1.34% (0.01337) | 83.99th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.00% (0.01004) | 81.34th | 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) |
| Feb 3, 2022 | 3.08% (0.03080) | 65.20th | v1 |
| Jan 6, 2022 | 3.08% (0.03080) | 64.86th | v1 |
| Sep 1, 2021 | 3.08% (0.03080) | 81.27th | v1 |
| Apr 14, 2021 | 3.08% (0.03080) | 0.00th | v1 |
References (18)
- http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html x_refsource_CONFIRM
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html x_refsource_CONFIRM
- http://www.securityfocus.com/bid/103517 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1040576 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2018-0733 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1561260 Issue Tracking
- https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=56d5a4bfcaf37fa420aef2bb881aa55e61cf5f2f x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2018-0733
- https://security.gentoo.org/glsa/201811-21 vendor-advisoryx_refsource_GENTOO
- https://security.netapp.com/advisory/ntap-20180330-0002/ x_refsource_CONFIRMThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2018-0733
- https://www.openssl.org/news/secadv/20180327.txt x_refsource_CONFIRMVendor Advisory
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html x_refsource_MISC
- https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html x_refsource_CONFIRM
- https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html x_refsource_MISC
- https://www.tenable.com/security/tns-2018-04 x_refsource_CONFIRM
- https://www.tenable.com/security/tns-2018-06 x_refsource_CONFIRM
- https://www.tenable.com/security/tns-2018-07 x_refsource_CONFIRM
Change history (0)
No recorded changes yet.