CVE-2024-32650

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

HIGH
7.5
CVSS Score
Published: April 19, 2024 at 04:05 PM UTC
Updated: June 17, 2026 at 07:30 AM UTC
2 products affected across 2 vendorsRustlsRustls

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Severity
HIGH7.5
Exploit prediction
EPSS 0.9%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

All versions
Vendor states this is fixed in 0.21.11 (unknown)
v < 0.21.11v < 0.22.4v < 0.23.5= 0.20.0
Affected range stops below 0.21.11, so it looks safe — our inference, not a vendor statement
Affected range stops below 0.22.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 0.23.5, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-835

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