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MEDIUM

Large RSA keys can cause high CPU usage in crypto/tls

Published Aug 2, 2023

Description

Extremely large RSA keys in certificate chains can cause a client/server to expend significant CPU time verifying signatures. With fix, the size of RSA keys transmitted during handshakes is restricted to <= 8192 bits. Based on a survey of publicly trusted RSA keys, there are currently only three certificates in circulation with keys larger than this, and all three appear to be test certificates that are not actively deployed. It is possible there are larger keys in use in private PKIs, but we target the web PKI, so causing breakage here in the interests of increasing the default safety of users of crypto/tls seems reasonable.

Affected products

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-400

Uncontrolled Resource Consumption

References (11)

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED
Assigner Go
Published Aug 2, 2023
Updated Feb 13, 2025
Reserved Apr 5, 2023
Link CVE-2023-29409

CISA Vulnrichment

Updated Oct 22, 2024

NVD

Status Modified
Modified Jun 17, 2026
Link CVE-2023-29409

Red Hat

Severity Moderate
Public date Aug 2, 2023
Bugzilla 2228743
Link CVE-2023-29409

ENISA EUVD

Assigner Go
Published Aug 2, 2023
Updated Feb 13, 2025
Link EUVD-2023-32978

GitHub

No data