CVE-2023-33850 IBM GSKit-Crypto information disclosure

High 7.5 Published 22 Aug 2023 Updated 3 Nov 2025

A remote attacker can exploit a timing side-channel in RSA decryption to obtain sensitive information from IBM GSKit-Crypto.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2023-33850?

CVE-2023-33850 is a high-severity vulnerability in IBM CICS TX Advanced, published on 22 Aug 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

IBM GSKit-Crypto could allow a remote attacker to obtain sensitive information, caused by a timing-based side channel in the RSA Decryption implementation. By sending an overly large number of trial messages for decryption, an attacker could exploit this vulnerability to obtain sensitive information.

Weakness: CWE-203

Which versions are affected by CVE-2023-33850?

It affects 2 products.

Products include Ibm Cics Tx, Ibm Txseries for Multiplatform.

How do I fix CVE-2023-33850?

Apply the vendor's patch.

Is CVE-2023-33850 being exploited?

There is no known exploitation of CVE-2023-33850 in the wild and no public exploit code.

Sources

Also known as GHSA-xxxm-cq2q-5v69.