CVE-2018-0733

What it is

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).

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data tampering.

Exploit odds

8.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2018-03-27 21:29 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 01:31 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 8.3% in the next 30 days (EPSS).
• Severity: 5.9 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2018-03-27 21:29 UTC

Last modified

2026-06-17 01:31 UTC

Exploit probability

8.3% · EPSS, next 30 days

Record status

Modified

Affected

• OpenSSL ≤ 1.1.0g

Attack profile CVSS 3.0 · 5.9

Attack vector

Network

Complexity

High

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2018-0733.md and follow it. Check whether this project is affected by CVE-2018-0733. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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