CVE-2023-38283Network attack vector

BGP session reset via malformed OTC attribute

Published Aug 29, 2023 · Updated Oct 2, 2024

Improper BGP path-attribute handling in OpenBGPD before 8.1 allows remote attackers to reset routing sessions via malformed UPDATE data. The bgpd RDE parser fails to advance plen by attr_len after marking a malformed Only-to-Customer attribute invalid, causing remaining data to be misparsed. Exposure requires receipt of the crafted update through a BGP peer; repeated resets can interrupt routed traffic.

CVSS severity5.3
Medium
EPSS probability1.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper BGP path-attribute handling in OpenBGPD before 8.1 allows remote attackers to reset routing sessions via malformed UPDATE data. The bgpd RDE parser fails to advance plen by attr_len after marking a malformed Only-to-Customer attribute invalid, causing remaining data to be misparsed. Exposure requires receipt of the crafted update through a BGP peer; repeated resets can interrupt routed traffic.

The record

CVE
CVE-2023-38283
Published
Aug 29, 2023
Updated
Oct 2, 2024
Vendor
OpenBSD Project
Product
OpenBGPD
Classifications
CWE-754, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 29, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 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?

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

  1. Affected versionversion=0 <8.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenBSD Project · OpenBGPDversion=0 <8.1

Published CVSS scores

5.3NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

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-754Improper Check for Unusual or Exceptional Conditions
T1499Endpoint Denial of Service

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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