CVE-2023-47234Network attack vector

Unauthenticated bgpd crash via malformed BGP UPDATE

Published Nov 3, 2023 · Updated Nov 4, 2025

Improper BGP UPDATE handling in FRRouting FRR 9.0.1 and earlier allows remote attackers to crash bgpd via a crafted message. The bgp_update_receive path continued parsing trailing NLRI after MP_UNREACH_NLRI even when mandatory path attributes were absent. Any unauthenticated BGP peer able to send the malformed UPDATE can terminate the routing daemon, interrupting BGP service without disclosing or altering data.

CVSS severity7.5
High
EPSS probability0.91%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper BGP UPDATE handling in FRRouting FRR 9.0.1 and earlier allows remote attackers to crash bgpd via a crafted message. The bgp_update_receive path continued parsing trailing NLRI after MP_UNREACH_NLRI even when mandatory path attributes were absent. Any unauthenticated BGP peer able to send the malformed UPDATE can terminate the routing daemon, interrupting BGP service without disclosing or altering data.

The record

CVE
CVE-2023-47234
Published
Nov 3, 2023
Updated
Nov 4, 2025
Vendor
FRRouting
Product
FRRouting
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 3, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=9.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FRRouting · FRRoutingversion=0 <=9.0.1

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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