CVE-2026-79896

Fortra BoKS Manager boks_portmux TLS ClientHello out-of-bounds read vulnerability

Published Oct 1, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
Fortra BoKS Manager contains an out-of-bounds read vulnerability in the custom TLS ClientHello parser used by boks_portmux. A remote unauthenticated attacker can submit a malformed ClientHello and terminate boks_portmux. Although the daemon is normally restarted automatically, repeated requests can sustain the service interruption.

Remediation

Vendor Solution

Upgrade to boks-server 8.1.0.24 or boks-server 9.0.0.7.


Vendor Workaround

Until a fixed release is installed, restrict network access to boks_portmux listeners to trusted systems.

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Fortra
Fortra boks Manager
Vendors & Products Fortra
Fortra boks Manager
Type Values Removed Values Added
Description Fortra BoKS Manager contains an out-of-bounds read vulnerability in the custom TLS ClientHello parser used by boks_portmux. A remote unauthenticated attacker can submit a malformed ClientHello and terminate boks_portmux. Although the daemon is normally restarted automatically, repeated requests can sustain the service interruption.
Title Fortra BoKS Manager boks_portmux TLS ClientHello out-of-bounds read vulnerability
Weaknesses CWE-125
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Fortra
Published
Updated
Oct 1, 2026, 4:02 PM
Reserved
Aug 25, 2026, 2:50 PM
Status
Awaiting Analysis
Published
Oct 1, 2026, 4:17 PM
Modified
Oct 1, 2026, 8:34 PM