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Frrouting EUVDEUVD-2026-17060

| CVE-2026-5107 LOW
Improper Access Control (CWE-284)
2026-03-30 VulDB
Authentication Bypass Frr Frrouting
2.3
CVSS 4.0 · NVD
Temporal: 4.0
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Vulnerability Assessment

Weakness
CWE
CWE-284
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V8 - Authorization Access control enforcement
MITRE ATT&CK

1 technique across 1 tactic: Defense Evasion

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Impact

CVSS v3.1 base score of 4.2 (Low-Medium) with vector AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L reflects constrained exploitation: network-accessible but high attack complexity, limited to confidentiality (no impact), low integrity and availability impact. The PR:L (login required) factor is significant-only authenticated BGP peers can trigger the flaw, substantially reducing threat surface compared to unauthenticated RCE scenarios. The CVSS RL:O (Official Fix Available) notation confirms vendor patch availability. No CVSS exploitation maturity (E:X) or EPSS probability data provided limits quantitative risk comparison, but the confluence of authentication requirement, high complexity, and limited impact scope suggests this is a lower-priority vulnerability for most operators, though critical in targeted BGP hijacking or route manipulation scenarios where attacker control of a BGP session is established. Organizations running public-facing BGP infrastructure or accepting routes from untrusted peers should prioritize patching; internal deployments with strict BGP peer whitelisting face lower risk.
Exploit ScenarioDerived

An attacker with established BGP session credentials (or ability to compromise a BGP peer relationship) sends specially crafted EVPN Type-2 route advertisements to an FRR instance running a vulnerable version. Due to improper access control in process_type2_route, the attacker bypasses authorization checks, allowing manipulation of route advertisements that could disrupt network connectivity or redirect traffic. While high attack complexity and authentication requirements limit casual exploitation, this scenario is practical for advanced persistent threats targeting BGP infrastructure or for internal malicious actors with BGP peer access.
Monitor Track and reassess. Why: LOW severity (CVSS 0.1-3.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 30, 2026

Remote improper access control in FRRouting FRR up to version 10.5.1 allows authenticated remote attackers to bypass authorization checks in the EVPN Type-2 Route Handler (process_type2_route function), potentially leading to integrity and availability impacts. The vulnerability requires high attack complexity and authenticated access (PR:L), limiting immediate exploitation risk. An upstream fix (commit 7676cad65114aa23adde583d91d9d29e2debd045) is available; no public exploit code or active CISA KEV designation identified at time of analysis.

RemediationAI

Upstream fix available via commit 7676cad65114aa23adde583d91d9d29e2debd045 in FRRouting's GitHub repository. Users should update FRR to the next stable release after 10.5.1 that incorporates this commit (exact version number to be confirmed by consulting FRR release notes at https://github.com/FRRouting/frr/releases). For immediate protection pending a stable release, apply the commit directly via cherry-pick or await the next tagged release. Organizations can reduce exposure by implementing strict BGP peer authentication, limiting BGP session acceptance to trusted peers only, and monitoring BGP route advertisements for anomalies. No vendor-provided workaround independent of patching is documented.

Affected VersionsENISA

frr 10.5.1
frr 10.5.0

Affected Packages

euvd frr no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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Technical ContextAI · show details

FRRouting (FRR) is a free and open-source Internet routing protocol daemon suite implementing BGP, OSPF, RIP, ISIS, and other protocols on Unix-like platforms. The vulnerability exists in the EVPN (Ethernet VPN) Type-2 Route Handler within bgpd/bgp_evpn.c, specifically in the process_type2_route function. CWE-284 (Improper Access Control - Permissions, Privileges, and Other Access Controls) indicates the root cause is a failure to properly restrict access to or modification of resources. The affected component processes BGP EVPN Type-2 routes, which are used in MPLS-based Ethernet VPNs for MAC/IP advertisement. The improper access control likely allows an authenticated BGP peer to manipulate route processing logic beyond intended authorization boundaries.

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Severity by source

NVD PRIMARY 2.3 LOW
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
CIRCL (temporal) 4.0 MEDIUM
SUSE 3.6 LOW
AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L
Red Hat 4.2 MEDIUM

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
High
Attack Requirements
None
Privileges Required
Low
User Interaction
None
Vulnerable system: Confidentiality
None
Vulnerable system: Integrity
Low
Vulnerable system: Availability
Low
Subsequent system: Confidentiality
None
Subsequent system: Integrity
None
Subsequent system: Availability
None

Lifecycle Timeline

2
Patch released
Mar 30, 2026 - 05:45 nvd
Patch available
CVE Published
Mar 30, 2026 - 05:00 nvd
LOW 2.3

DescriptionCVE.org

A vulnerability has been found in FRRouting FRR up to 10.5.1. This affects the function process_type2_route of the file bgpd/bgp_evpn.c of the component EVPN Type-2 Route Handler. The manipulation leads to improper access controls. The attack can be initiated remotely. The attack is considered to have high complexity. The exploitability is reported as difficult. The identifier of the patch is 7676cad65114aa23adde583d91d9d29e2debd045. To fix this issue, it is recommended to deploy a patch.

Threat Intelligence Overview

EPSS Score
0.0%
Top 87% exploitable
Data Quality
9 sources
Confidence: High
EUVD NVD CVE.org EPSS Vulnrichment Vendor CIRCL GitHub VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity LOW
CISA KEV No
Public POC No
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
LOW severity (CVSS 0.1-3.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Defer
Exploitation
None
System Exposure· derived
Open
Automatable
No
Human Impact· derived
Low
Technical Impact
Partial

Priority Score

12
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +12
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

More in Frrouting

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CVE-2022-37032 CRITICAL POC
9.1 Sep 19

An out-of-bounds read in the BGP daemon of FRRouting FRR before 8.4 may lead to a segmentation fault and denial of servi
CVE-2022-37035 HIGH POC
8.1 Aug 02

An issue was discovered in bgpd in FRRouting (FRR) 8.3. Rated high severity (CVSS 8.1), this vulnerability is remotely e
CVE-2022-26129 HIGH POC
7.8 Mar 03

Buffer overflow vulnerabilities exist in FRRouting through 8.1.0 due to wrong checks on the subtlv length in the functio
CVE-2022-26128 HIGH POC
7.8 Mar 03

A buffer overflow vulnerability exists in FRRouting through 8.1.0 due to a wrong check on the input packet length in the
CVE-2022-26127 HIGH POC
7.8 Mar 03

A buffer overflow vulnerability exists in FRRouting through 8.1.0 due to missing a check on the input packet length in t
CVE-2022-26126 HIGH POC
7.8 Mar 03

Buffer overflow vulnerabilities exist in FRRouting through 8.1.0 due to the use of strdup with a non-zero-terminated bin
CVE-2022-26125 HIGH POC
7.8 Mar 03

Buffer overflow vulnerabilities exist in FRRouting through 8.1.0 due to wrong checks on the input packet length in isisd
CVE-2023-38802 HIGH POC
7.5 Aug 29

FRRouting FRR 7.5.1 through 9.0 and Pica8 PICOS 4.3.3.2 allow a remote attacker to cause a denial of service via a craft
CVE-2023-31490 HIGH POC
7.5 May 09

An issue found in Frrouting bgpd v.8.4.2 allows a remote attacker to cause a denial of service via the bgp_attr_psid_sub
CVE-2023-38406 CRITICAL
9.8 Nov 06

bgpd/bgp_flowspec.c in FRRouting (FRR) before 8.4.3 mishandles an nlri length of zero, aka a "flowspec overflow.". Rated
CVE-2023-41361 CRITICAL
9.8 Aug 29

An issue was discovered in FRRouting FRR 9.0. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploit
CVE-2023-31489 MEDIUM POC
5.5 May 09

An issue found in Frrouting bgpd v.8.4.2 allows a remote attacker to cause a denial of service via the bgp_capability_ll

Same weakness CWE-284 – Improper Access Control

View all
CVE-2015-3306 CRITICAL POC
10.0
CVE-2012-4681 CRITICAL POC
9.8
CVE-2011-3544 CRITICAL POC
9.8
CVE-2012-1723 CRITICAL POC
9.8
CVE-2012-5076 CRITICAL POC
9.8
CVE-2014-3120 HIGH POC
8.1
CVE-2013-2423 LOW POC
3.7
CVE-2016-3427 CRITICAL
9.8

Same technique Authentication Bypass

View all
CVE-2023-22515 CRITICAL POC
9.8
CVE-2013-2465 CRITICAL POC
9.8
CVE-2022-40684 CRITICAL POC
9.8
CVE-2025-61882 CRITICAL POC
9.8
CVE-2024-0012 CRITICAL POC
9.3

Vendor StatusVendor

Debian

Bug #1132329
frr
Release Status Fixed Version Urgency
bullseye vulnerable 7.5.1-1.1+deb11u2 -
bullseye (security) vulnerable 7.5.1-1.1+deb11u4 -
bookworm, bookworm (security) vulnerable 8.4.4-1.1~deb12u1 -
trixie vulnerable 10.3-3 -
forky vulnerable 10.5.3-1 -
sid fixed 10.6.0-2 -
(unstable) fixed 10.6.0-2 -

SUSE

Severity: Low
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Server Applications 15 SP7 Fixed
SUSE Linux Enterprise Server 15 SP7 Fixed
SUSE Linux Enterprise Server 16.0 Fixed
SUSE Linux Enterprise Server 16.1 Fixed

References

Advisories & patches
PATCH https://github.com/FRRouting/frr/commit/7676cad65114aa23adde583d91d9d29e2debd045 PATCH https://github.com/FRRouting/frr/pull/21098 ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-5107 ADVISORY https://vuldb.com/vuln/354132 REF https://github.com/FRRouting/frr/ REF https://vuldb.com/submit/780123 REF https://vuldb.com/vuln/354132 REF https://vuldb.com/vuln/354132/cti

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