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Vulnerability record · CVE-2023-34758 · published 28 August 2023

CVE-2023-34758: Bishopfox sliver broken cryptographic algorithm vulnerability

Bishopfox · Sliver

Sliver from v1.5.x to v1.5.39 has an improper cryptographic implementation, which allows attackers to execute a man-in-the-middle attack via intercepted and crafted responses.

8.1 CVSS 3.1 High EPSS 0.59% · top 54.0% CWE-327 · Broken cryptographic algorithm
8.1CVSS 3.1 base score
0.59%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

Sliver from v1.5.x to v1.5.39 has an improper cryptographic implementation, which allows attackers to execute a man-in-the-middle attack via intercepted and crafted responses.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/BishopFox/sliver/releases/tag/v1.5.40 Release Notes
https://github.com/advisories/GHSA-8jxm-xp43-qh3q Third Party Advisory
https://github.com/tangent65536/Slivjacker Broken Link
https://www.chtsecurity.com/news/04f41dcc-1851-463c-93bc-551323ad8091 Third Party Advisory
https://github.com/BishopFox/sliver/releases/tag/v1.5.40 Release Notes
https://github.com/advisories/GHSA-8jxm-xp43-qh3q Third Party Advisory
https://github.com/tangent65536/Slivjacker Broken Link
https://www.chtsecurity.com/news/04f41dcc-1851-463c-93bc-551323ad8091 Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2026-25791Bishopfox sliver missing authentication for critical function vulnerabilitySliver is a command and control framework that uses a custom Wireguard netstack. Prior to 1.7.0, the DNS C2 listener accepts unauthenticated TOTP boo…EPSS 0.51%6.9CVE-2025-27090Bishopfox sliver server-side request forgery (ssrf) vulnerabilitySliver is an open source cross-platform adversary emulation/red team framework, it can be used by organizations of all sizes to perform security test…EPSS 0.63%6.5CVE-2026-25760Bishopfox sliver path traversal vulnerabilitySliver is a command and control framework that uses a custom Wireguard netstack. Prior to 1.6.11, a path traversal in the website content subsystem l…EPSS 0.52%5.9CVE-2026-34227Bishopfox sliver missing authentication for critical function vulnerabilitySliver is a command and control framework that uses a custom Wireguard netstack. Prior to version 1.7.4, a single click on a malicious link gives an …EPSS 0.47%5.7CVE-2026-32941Bishopfox sliver allocation without limits vulnerabilitySliver is a command and control framework that uses a custom Wireguard netstack. Versions 1.7.3 and below contain a Remote OOM (Out-of-Memory) vulner…EPSS 0.44%2.1CVE-2026-29781Bishopfox sliver null pointer dereference vulnerabilitySliver is a command and control framework that uses a custom Wireguard netstack. In versions from 1.7.3 and prior, a vulnerability exists in the Sliv…EPSS 0.52%

Source: NIST National Vulnerability Database (record CVE-2023-34758), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.