---
id: CVE-2025-50681
title: >-
  igmpproxy 0.4 before commit 2b30c36 allows remote attackers to cause a denial
  of service (application crash) via a crafted IGMPv3 membership report packet
  with a malicious source address
summary: >-
  igmpproxy 0.4 before commit 2b30c36 allows remote attackers to cause a denial
  of service (application crash) via a crafted IGMPv3 membership report packet
  with a malicious source address. Due to insufficient validation in the
  `recv_igmp(…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-120
vendor: pali
product: igmpproxy
affected:
  - igmpproxy = 0.4
published: '2025-12-19'
updated: '2026-10-05'
sourceUpdated: '2026-10-05T18:10:00.200'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-50681'
references:
  - url: 'https://gist.github.com/miora-sora/dac1612d16c45c2aedb8605478adc28f'
    label: cve@mitre.org
  - url: 'https://github.com/pali/igmpproxy/issues/97'
    label: cve@mitre.org
  - url: >-
      https://github.com/younix/igmpproxy/commit/2b30c36e6ab5b21defb76ec6458ab7687984484c
    label: cve@mitre.org
  - url: 'https://github.com/pali/igmpproxy/issues/97'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00523
epssPercentile: 0.42358
ingestedAt: '2026-10-05T18:29:11.154Z'
---

## Overview

igmpproxy 0.4 before commit 2b30c36 allows remote attackers to cause a denial of service (application crash) via a crafted IGMPv3 membership report packet with a malicious source address. Due to insufficient validation in the `recv_igmp()` function in src/igmpproxy.c, an invalid group record type can trigger a NULL pointer dereference when logging the address using `inet_fmtsrc()`. This vulnerability can be exploited by sending malformed multicast traffic to a host running igmpproxy, leading to a crash. igmpproxy is used in various embedded networking environments and consumer-grade IoT devices (such as home routers and media gateways) to handle multicast traffic for IPTV and other streaming services. Affected devices that rely on unpatched versions of igmpproxy may be vulnerable to remote denial-of-service attacks across a LAN .

## Affected

- `igmpproxy = 0.4`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.