---
cve: "CVE-2026-46433"
severity: "MEDIUM"
cvss: 6.5
epss: "0.4%"
vendor: "lldpd"
kev: false
exploited: false
published: "2026-06-09 23:16:59"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-10-02T05:03:53+02:00"
---

# CVE-2026-46433

> 6.5 MEDIUM · 🧪 PoC

## Beschreibung

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.

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **no**
  - Technical Impact: **partial**

## CVSS-Vektor

```
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Benachbart | warn |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- df8d7298598f4ff4cbb20957ccb4e8e2bde96f06 (Commit)
- ca931be63a9cae0fcd8e9b6ae4e916d49f141cd6 (Commit)

## Referenzen

- <https://github.com/lldpd/lldpd/security/advisories/GHSA-2g8p-2h3j-63m3>
- <https://github.com/lldpd/lldpd/pull/787>
- <https://github.com/lldpd/lldpd/commit/ca931be63a9cae0fcd8e9b6ae4e916d49f141cd6>
- <https://github.com/lldpd/lldpd/releases/tag/1.0.22>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-46433) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_