CVE-2026-46433

Adjacent daemon crash via excessive VLAN memmove length

Published Jun 9, 2026 · Updated Jun 9, 2026

Out-of-bounds read in lldpd before 1.0.22 allows attackers on the same broadcast domain to crash the daemon with a VLAN-tagged frame. The lldpd_decode() VLAN path passes memmove() a length four bytes too large, reading past the MTU-sized heap allocation. A received frame must equal the interface MTU; the over-read reliably crashes AddressSanitizer builds and typically interrupts the daemon.

CVSS severity6.5
Medium
EPSS probability0.22%
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 lldpd before 1.0.22 allows attackers on the same broadcast domain to crash the daemon with a VLAN-tagged frame. The lldpd_decode() VLAN path passes memmove() a length four bytes too large, reading past the MTU-sized heap allocation. A received frame must equal the interface MTU; the over-read reliably crashes AddressSanitizer builds and typically interrupts the daemon.

The record

CVE
CVE-2026-46433
Published
Jun 9, 2026
Updated
Jun 9, 2026
Vendor
lldpd
Product
lldpd
Classifications
CWE-125, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 9, 2026Record 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=< 1.0.22

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

lldpd · lldpdversion=< 1.0.22

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:A/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)
Vectoradjacent
Privilegesunauthenticated
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.

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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