CVE-2025-50681

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 .

References

Affected packages

Git / github.com/younix/igmpproxy

Affected ranges

Type: GIT
Repo: https://github.com/younix/igmpproxy
Events: Introduced

0 Unknown introduced commit / All previous commits are affected

Fixed

2b30c36e6ab5b21defb76ec6458ab7687984484c

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-50681.json"

vanir_signatures

[
    {
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/younix/igmpproxy/commit/2b30c36e6ab5b21defb76ec6458ab7687984484c",
        "digest": {
            "function_hash": "125283243172514325869585877938982509972",
            "length": 518.0
        },
        "id": "CVE-2025-50681-d8be066d",
        "deprecated": false,
        "target": {
            "file": "src/igmp.c",
            "function": "igmpPacketKind"
        }
    },
    {
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/younix/igmpproxy/commit/2b30c36e6ab5b21defb76ec6458ab7687984484c",
        "digest": {
            "line_hashes": [
                "50756659220313699263941561237967214109",
                "137406112687305645020945776008216062222",
                "241535495667436516775284101324537388911",
                "269139974807778238392254168350042994888"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2025-50681-ef7498cb",
        "deprecated": false,
        "target": {
            "file": "src/igmp.c"
        }
    }
]