CVE-2018-0733
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.
Does this matter?
Lower severity and a low EPSS score (8.28%). Track it; it rarely justifies an emergency change on its own.
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).
- CVSS 3.0
- 5.9 MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 8.28% probability · 95th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- openssl/openssl
- Source
- openssl-security@openssl.org
EPSS 8.3% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
- http://www.securityfocus.com/bid/103517Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1040576Third Party Advisory, VDB Entry
- https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=56d5a4bfcaf37fa420aef2bb881aa55e61cf5f2f
- https://security.gentoo.org/glsa/201811-21
- https://security.netapp.com/advisory/ntap-20180330-0002/Third Party Advisory
- https://www.openssl.org/news/secadv/20180327.txtVendor Advisory
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
- https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
- https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
- https://www.tenable.com/security/tns-2018-04
- https://www.tenable.com/security/tns-2018-06
- https://www.tenable.com/security/tns-2018-07
- http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
- http://www.securityfocus.com/bid/103517Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1040576Third Party Advisory, VDB Entry
- https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=56d5a4bfcaf37fa420aef2bb881aa55e61cf5f2f
- https://security.gentoo.org/glsa/201811-21
- https://security.netapp.com/advisory/ntap-20180330-0002/Third Party Advisory
- https://www.openssl.org/news/secadv/20180327.txtVendor Advisory
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
- https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
- https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
- https://www.tenable.com/security/tns-2018-04
- https://www.tenable.com/security/tns-2018-06
- https://www.tenable.com/security/tns-2018-07
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.