CVE-2023-32342: IBM GSKit information disclosure

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-05-30 · updated 2026-06-17
Weakness: CWE-203

Description

IBM GSKit 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. IBM X-Force ID: 255828.

Affected products

IBM HTTP Server: from 8.5.0.0 before 8.5.5.24; from 9.0.0.0 before 9.0.5.16 — fixed in 8.5.5.24, 9.0.5.16

How to fix

Upgrade to a fixed version: IBM HTTP Server 8.5.5.24, 9.0.5.16. Check the vendor advisory for mitigations.

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/255828
https://exchange.xforce.ibmcloud.com/vulnerabilities/255828

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