# CVE-2024-3296: Rust-openssl: timing based side-channel can lead to a bleichenbacher style attack

Status: published. Published: 2024-04-04. Updated: 2026-11-05.

A timing-based side-channel flaw exists in the rust-openssl package, which could be sufficient to recover a plaintext across a network in a Bleichenbacher-style attack. To achieve successful decryption, an attacker would have to be able to send a large number of trial messages for decryption. The vulnerability affects the legacy PKCS#1v1.5 RSA encryption padding mode.

## Remediation

- workaround: Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. (source: CNA: redhat)

## Affected products and versions

-  /  (rust-openssl): ≥ 3.2.0; < * (affected, semver). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (389-ds:1.4/389-ds-base): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (python3.12-cryptography): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (389-ds-base): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (keylime-agent-rust): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (python3.12-cryptography): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 5.9 (medium); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: 0.41% as of 2026-11-04; percentile 35.97%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-208

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/security/cve/CVE-2024-3296 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2269723 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2024-3296 (ADP: CVE; vdb-entry, x_refsource_REDHAT, x_transferred)

- https://bugzilla.redhat.com/show_bug.cgi?id=2269723 (ADP: CVE; issue-tracking, x_refsource_REDHAT, x_transferred)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2024-3296; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2024-3296; retrieved 2026-11-05; source updated Not reported

Revision: 570d554fa54e2c619c254db0f02390c45f05ca6b26547d2448d4d63ac26f7396

Canonical: https://y2.dev/cve/CVE-2024-3296

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