CVE-2023-41358Network attack vector

Remote bgpd crash via zero-length BGP attributes

Published Aug 29, 2023 · Updated Aug 2, 2024

NULL pointer dereference in FRRouting FRR 9.0 and earlier allows remote attackers to crash bgpd via a crafted BGP UPDATE. bgp_update_receive processes NLRI when the update has data but a zero attribute length, so route-map handling receives NULL attributes and dereferences the NULL aspath pointer. Remote attackers must deliver an UPDATE over a BGP peering session; the demonstrated path interrupts bgpd without reported data disclosure or code execution.

CVSS severity7.5
High
EPSS probability1.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in FRRouting FRR 9.0 and earlier allows remote attackers to crash bgpd via a crafted BGP UPDATE. bgp_update_receive processes NLRI when the update has data but a zero attribute length, so route-map handling receives NULL attributes and dereferences the NULL aspath pointer. Remote attackers must deliver an UPDATE over a BGP peering session; the demonstrated path interrupts bgpd without reported data disclosure or code execution.

The record

CVE
CVE-2023-41358
Published
Aug 29, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 29, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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

7.5NIST NVDCVSS: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.

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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

CWE-476NULL Pointer Dereference
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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