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CVE-2024-28854: Slow loris vulnerability with default configuration in tls-listener

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2024-03-15 · updated 2026-06-17
• Weakness: CWE-400

Description

tls-listener is a rust lang wrapper around a connection listener to support TLS. With the default configuration of tls-listener, a malicious user can open 6.4 `TcpStream`s a second, sending 0 bytes, and can trigger a DoS. The default configuration options make any public service using `TlsListener::new()` vulnerable to a slow-loris DoS attack. This impacts any publicly accessible service using the default configuration of tls-listener in versions prior to 0.10.0. Users are advised to upgrade. Users unable to upgrade may mitigate this by passing a large value, such as `usize::MAX` as the parameter to `Builder::max_handshakes`.

Affected products

• tmccombs tls-listener: before 0.10.0 — fixed in 0.10.0

How to fix

Upgrade to a fixed version: tmccombs tls-listener 0.10.0. Check the vendor advisory for mitigations.

References

• https://en.wikipedia.org/wiki/Slowloris_(computer_security)
• https://github.com/tmccombs/tls-listener/commit/d5a7655d6ea9e53ab57c3013092c5576da964bc4
• https://github.com/tmccombs/tls-listener/security/advisories/GHSA-2qph-qpvm-2qf7
• https://en.wikipedia.org/wiki/Slowloris_(computer_security)
• https://github.com/tmccombs/tls-listener/commit/d5a7655d6ea9e53ab57c3013092c5576da964bc4
• https://github.com/tmccombs/tls-listener/security/advisories/GHSA-2qph-qpvm-2qf7

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