What’s Vulnerable › Vulnerabilities

CVE-2024-32650: Rustls vulnerable to an infinite loop in rustls::conn::ConnectionCommon::complete_io() with proper client input

• 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: 2024-04-19 · updated 2026-06-17
• Weakness: CWE-835

Description

Rustls is a modern TLS library written in Rust. `rustls::ConnectionCommon::complete_io` could fall into an infinite loop based on network input. When using a blocking rustls server, if a client send a `close_notify` message immediately after `client_hello`, the server's `complete_io` will get in an infinite loop. This vulnerability is fixed in 0.23.5, 0.22.4, and 0.21.11.

Affected products

• rustls: from 0.23.0, < 0.23.5; from 0.22.0, < 0.22.4; from 0.21.0, < 0.21.11; = 0.20.0

References

• https://github.com/rustls/rustls/commit/2123576840aa31043a31b0770e6572136fbe0c2d
• https://github.com/rustls/rustls/commit/6e938bcfe82a9da7a2e1cbf10b928c7eca26426e
• https://github.com/rustls/rustls/commit/f45664fbded03d833dffd806503d3c8becd1b71e
• https://github.com/rustls/rustls/security/advisories/GHSA-6g7w-8wpp-frhj
• https://github.com/rustls/rustls/commit/2123576840aa31043a31b0770e6572136fbe0c2d
• https://github.com/rustls/rustls/commit/6e938bcfe82a9da7a2e1cbf10b928c7eca26426e
• https://github.com/rustls/rustls/commit/f45664fbded03d833dffd806503d3c8becd1b71e
• https://github.com/rustls/rustls/security/advisories/GHSA-6g7w-8wpp-frhj

Get alerted when CVE-2024-32650 or the next vulnerability affects your stack