CVE-2025-11961

pcapetheraton() is an auxiliary function in libpcap, it takes a string argument and returns a fixed-size allocated buffer. The string argument must be a well-formed MAC-48 address in one of the supported formats, but this requirement has been poorly documented. If an application calls the function with an argument that deviates from the expected format, the function can read data beyond the end of the provided string and write data beyond the end of the allocated buffer.

Database specific

{
    "cwe_ids": [
        "CWE-122",
        "CWE-126"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/11xxx/CVE-2025-11961.json",
    "cna_assigner": "Tcpdump"
}

References

Affected packages

Git / github.com/the-tcpdump-group/libpcap

Affected ranges

Type

GIT

Repo

https://github.com/the-tcpdump-group/libpcap

Events

Introduced

Fixed

b2d2f9a9a0581c40780bde509f7cc715920f1c02

Database specific

Show details

{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.10.6"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

libpcap-0.*

libpcap-0.6.1

libpcap-0.7.1

libpcap-0.8-bp

libpcap-1.*

libpcap-1.10-bp

libpcap-1.10.0

libpcap-1.10.1

libpcap-1.10.2

libpcap-1.10.3

libpcap-1.10.4

libpcap-1.10.5

libpcap-1.7.0-bp

libpcap-1.8.0-bp

libpcap-1.8.1

libpcap-1.9-bp

libpcap-1.9.0-rc1

Database specific

vanir_signatures_modified

"2026-08-12T14:52:30Z"

vanir_signatures

[
    {
        "id": "CVE-2025-11961-6ce1e85f",
        "deprecated": false,
        "signature_type": "Function",
        "signature_version": "v1",
        "digest": {
            "length": 410.0,
            "function_hash": "338532573539372724252146539691131172866"
        },
        "source": "https://github.com/the-tcpdump-group/libpcap/commit/b2d2f9a9a0581c40780bde509f7cc715920f1c02",
        "target": {
            "function": "pcap_ether_aton",
            "file": "nametoaddr.c"
        }
    },
    {
        "id": "CVE-2025-11961-6f0751ce",
        "deprecated": false,
        "signature_type": "Line",
        "signature_version": "v1",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "311569667773513847727913042935363540295",
                "106228714869592264064763436068520160220",
                "95986298097032568012137342931103343975",
                "254403214378536382176307593068908471968",
                "46286724075191951667710445501115730479",
                "80874710227248265914467820316748394126",
                "223950252177547405893794282149651364283",
                "23970399444445464471299991953629743808",
                "16762061561596678447394158208615903000",
                "89164239427011409971112911346121532244",
                "297440721378684511226887532710748698283",
                "313716033195347506299463177491141301343",
                "253765699520873696296756073701305251658",
                "296997619590315164428447432204036898262",
                "41317110967919725399841091712416863468",
                "298546271216788835721686224685871469976",
                "242397809105726062962625968727851191454",
                "56142706446188915423301179927568760075",
                "50914070020879022587063928716535553729",
                "92426788780852392788908933606465342640",
                "252567964987038432047843894244955908626"
            ]
        },
        "source": "https://github.com/the-tcpdump-group/libpcap/commit/b2d2f9a9a0581c40780bde509f7cc715920f1c02",
        "target": {
            "file": "nametoaddr.c"
        }
    }
]

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-11961.json"