CVE-2023-46753Public exploitNetwork attack vector

BGP daemon crash via incomplete mandatory attribute validation

Published Oct 26, 2023 · Updated Nov 4, 2025

Denial of service in FRRouting FRR 9.0.1 and earlier allows remote attackers to crash bgpd with a crafted BGP UPDATE message. In bgpd/bgp_attr.c, bgp_attr_check treats an unset attribute flag as a valid Graceful Restart end-of-RIB marker without also requiring a zero path-attribute length, allowing an UPDATE containing only an unknown transitive attribute to bypass mandatory-attribute rejection and reach a null dereference. The peer must negotiate Graceful Restart and establish a BGP session; exploitation terminates the routing daemon without affecting confidentiality or integrity.

CVSS severity5.9
Medium
EPSS probability0.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in FRRouting FRR 9.0.1 and earlier allows remote attackers to crash bgpd with a crafted BGP UPDATE message. In bgpd/bgp_attr.c, bgp_attr_check treats an unset attribute flag as a valid Graceful Restart end-of-RIB marker without also requiring a zero path-attribute length, allowing an UPDATE containing only an unknown transitive attribute to bypass mandatory-attribute rejection and reach a null dereference. The peer must negotiate Graceful Restart and establish a BGP session; exploitation terminates the routing daemon without affecting confidentiality or integrity.

The record

CVE
CVE-2023-46753
Published
Oct 26, 2023
Updated
Nov 4, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-863, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 26, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.9NIST NVDCVSS:3.1/AV:N/AC:H/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1499.004Application or System Exploitation

Public exploit references

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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