lldpd is an implementation of IEEE 802.1ab (LLDP). Prior to version 1.0.22, lldpd_decode() in src/daemon/lldpd.c strips 802.1Q VLAN tags from received Ethernet frames by calling memmove() to shift the frame payload 4 bytes left. The third argument (byte count) is s - 2 * ETHER_ADDR_LEN but should be s - 2 * ETHER_ADDR_LEN - 4, causing a 4-byte heap buffer over-read past the malloc(h_mtu) allocation when the received frame size equals the interface MTU. This issue has been patched in version 1.0.22.

No CVSS v4.0

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
lldpd lldpd affected
Version Status Constraints
< 1.0.22 affected —

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Project Subscriptions

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/lldpd/lldpd/commit/ca931be63a9cae0fcd8e9b6ae4e916d49f141cd6 cve-icon cve-icon
https://github.com/lldpd/lldpd/pull/787 cve-icon cve-icon
https://github.com/lldpd/lldpd/releases/tag/1.0.22 cve-icon cve-icon
https://github.com/lldpd/lldpd/security/advisories/GHSA-2g8p-2h3j-63m3 cve-icon cve-icon
History

Tue, 09 Jun 2026 23:00:00 +0000

Type Values Removed Values Added
Description lldpd is an implementation of IEEE 802.1ab (LLDP). Prior to version 1.0.22, lldpd_decode() in src/daemon/lldpd.c strips 802.1Q VLAN tags from received Ethernet frames by calling memmove() to shift the frame payload 4 bytes left. The third argument (byte count) is s - 2 * ETHER_ADDR_LEN but should be s - 2 * ETHER_ADDR_LEN - 4, causing a 4-byte heap buffer over-read past the malloc(h_mtu) allocation when the received frame size equals the interface MTU. This issue has been patched in version 1.0.22.
Title lldpd: Heap OOB Read in VLAN Decapsulation memmove
Weaknesses CWE-125
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-06-09T22:49:02.749Z

Reserved: 2026-05-13T22:18:22.830Z

Link: CVE-2026-46433

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-06-09T23:16:59.437

Modified: 2026-06-09T23:16:59.437

Link: CVE-2026-46433

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-10T00:30:17Z

Weaknesses