CVE-2026-37459

frr: denial of service via crafted BGP UPDATE message

Published May 4, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
An integer underflow in FRRouting (FRR) stable/10.0 to stable/10.6 allows attackers to cause a Denial of Service (DoS) via supplying a crafted BGP UPDATE message.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Ubuntu USN Ubuntu USN USN-8376-1 FRR vulnerabilities
History
Type Values Removed Values Added
Title Integer Underflow in FRRouting Leads to Denial of Service via Crafted BGP UPDATE frr: denial of service via crafted BGP UPDATE message
Weaknesses CWE-191
References
Metrics threat_severity

None

threat_severity

Important

Type Values Removed Values Added
Title Integer Underflow in FRRouting Leads to Denial of Service via Crafted BGP UPDATE
Type Values Removed Values Added
Title Integer Underflow in FRRouting BGP Update Processing Causing Denial of Service
Weaknesses CWE-193
Type Values Removed Values Added
Weaknesses CWE-400
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'}

ssvc

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

Type Values Removed Values Added
First Time appeared Frrouting
Frrouting frrouting
Vendors & Products Frrouting
Frrouting frrouting
Type Values Removed Values Added
Title Integer Underflow in FRRouting BGP Update Processing Causing Denial of Service
Weaknesses CWE-193
Type Values Removed Values Added
Description An integer underflow in FRRouting (FRR) stable/10.0 to stable/10.6 allows attackers to cause a Denial of Service (DoS) via supplying a crafted BGP UPDATE message.
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Jul 15, 2026, 1:02 AM
Reserved
Apr 6, 2026, 12:00 AM
Status
Deferred
Published
May 4, 2026, 6:16 PM
Modified
Jul 15, 2026, 2:20 AM
Severity
Important
Public date
May 4, 2026, 12:00 AM