CVE-2026-46433CWE-125

lldpd: Heap OOB Read in VLAN Decapsulation memmove

Medium · published June 9, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
29.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00370 · 29.7th percentile
Weakness
CWE-125 · Out-of-bounds Read
Published
2026-06-09T22:49Z
EPSS history
Timeline
  • 09 JUN 22:49Z
    lldpd: Heap OOB Read in VLAN Decapsulation memmove
    cvelistv5