CVE-2022-40318Network attack vector

Daemon restart via undersized BGP option check

Published May 3, 2023 · Updated Aug 3, 2024

Out-of-bounds read in bgpd in FRRouting FRR 8.4 and earlier allows remote authenticated users to restart bgpd via a crafted BGP OPEN message. When Extended Optional Parameters capability is active, bgp_open_option_parse checks for a two-byte header but reads three bytes for option type 0xff. A configured BGP peer able to send the malformed OPEN can trigger an assertion failure or out-of-bounds read, interrupting routing until bgpd restarts.

CVSS severity6.5
Medium
EPSS probability1.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in bgpd in FRRouting FRR 8.4 and earlier allows remote authenticated users to restart bgpd via a crafted BGP OPEN message. When Extended Optional Parameters capability is active, bgp_open_option_parse checks for a two-byte header but reads three bytes for option type 0xff. A configured BGP peer able to send the malformed OPEN can trigger an assertion failure or out-of-bounds read, interrupting routing until bgpd restarts.

The record

CVE
CVE-2022-40318
Published
May 3, 2023
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-125, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 3, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5UbuntuCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.5NISTCVSS:3.1/AV:N/AC:L/PR:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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