🛡️ GHSA-857q-xmph-p2v5 — s2n-tls

⚪ Unknown ✅ No Known Exploit CWE-287 OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

s2n-tls's mTLS API ordering may skip client authentication

Impact

An API ordering issue in s2n-tls can cause client authentication to unexpectedly not be enabled on the server when it otherwise appears to be. Server applications are impacted if client authentication is enabled by calling s2n_connection_set_config() before calling s2n_connection_set_client_auth_type().

Applications are not impacted if these APIs are called in the opposite order, or if client authentication is enabled on the config with s2n_config_set_client_auth_type(). s2n-tls clients verifying server certificates are not impacted.

Impacted versions: < v1.5.0.

Patches

The patch is included in v1.5.0 [1].

Workarounds

Applications can workaround this issue by calling s2n_connection_set_config() after calling s2n_connection_set_client_auth_type(), or by enabling client authentication on the config with s2n_config_set_client_auth_type().

If you have any questions or comments about this advisory we ask that you contact AWS/Amazon Security via our vulnerability reporting page [2] or directly via email to [aws-security@amazon.com](mailto:aws-security@amazon.com). Please do not create a public GitHub issue.

[1] https://github.com/aws/s2n-tls/releases/tag/v1.5.0

[2] https://aws.amazon.com/security/vulnerability-reporting

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality low, integrity low, availability none.

Weakness class

GHSA-857q-xmph-p2v5 is classified as CWE-287: Improper Authentication. The identity of the caller is not established correctly, so an attacker can act as another user.

Affected software

GHSA-857q-xmph-p2v5 is recorded against 1 package.

  • s2n-tls

Timeline and source

Published on 9 August 2024 and last revised on 4 February 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
github.com (Web)
github.com (Package)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
CWE CWE-287
Public Exploit ✅ No
Source OSV
Published 2024-08-09
Updated 2026-08-12
Modified 2026-02-04
Fix URL N/A

Affected Packages

Software From version Fixed in
s2n-tls — —

Similar Threats

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