CVE-2021-3566

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Source
https://cve.org/CVERecord?id=CVE-2021-3566
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-3566.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2021-3566
Downstream
Related
Published
2021-08-05T21:15:12.783Z
Modified
2026-08-18T14:05:42.782117Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N CVSS Calculator
Summary
[none]
Details

Prior to ffmpeg version 4.3, the tty demuxer did not have a 'read_probe' function assigned to it. By crafting a legitimate "ffconcat" file that references an image, followed by a file the triggers the tty demuxer, the contents of the second file will be copied into the output file verbatim (as long as the -vcodec copy option is passed to ffmpeg).

Database specific 
{
    "unresolved_ranges": [
        {
            "source": "CPE_STRING",
            "extracted_events": [
                {
                    "introduced": "9.0"
                },
                {
                    "last_affected": "9.0"
                }
            ],
            "cpes": [
                "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "debian:debian_linux"
        }
    ]
}
References

Affected packages

Git / git.ffmpeg.org/ffmpeg.git

Affected ranges

Type
GIT
Repo
https://git.ffmpeg.org/ffmpeg.git
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
80bb65fafab1d2f5f58a8453c6334c784ee27c08
Database specific
Show details 
{
    "source": "CPE_RANGE",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "4.3"
        }
    ],
    "cpe": "cpe:2.3:a:ffmpeg:ffmpeg:*:*:*:*:*:*:*:*"
}

Affected versions

Other
N
n0.*
n0.11-dev
n0.12-dev
n0.8
n1.*
n1.1-dev
n1.2-dev
n1.3-dev
n2.*
n2.0
n2.1-dev
n2.2-dev
n2.3-dev
n2.4-dev
n2.5-dev
n2.6-dev
n2.7-dev
n2.8-dev
n2.9-dev
n3.*
n3.1-dev
n3.2-dev
n3.3-dev
n3.4-dev
n3.5-dev
n4.*
n4.1-dev
n4.2-dev

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-3566.json"

Git / github.com/ffmpeg/ffmpeg

Affected ranges

Type
GIT
Repo
https://github.com/ffmpeg/ffmpeg
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
80bb65fafab1d2f5f58a8453c6334c784ee27c08
Fixed
3bce9e9b3ea35c54bacccc793d7da99ea5157532
Database specific
Show details 
{
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "4.3"
        }
    ],
    "cpe": "cpe:2.3:a:ffmpeg:ffmpeg:*:*:*:*:*:*:*:*"
}

Affected versions

Other
N
n0.*
n0.11-dev
n0.12-dev
n0.8
n1.*
n1.1-dev
n1.2-dev
n1.3-dev
n2.*
n2.0
n2.1-dev
n2.2-dev
n2.3-dev
n2.4-dev
n2.5-dev
n2.6-dev
n2.7-dev
n2.8-dev
n2.9-dev
n3.*
n3.1-dev
n3.2-dev
n3.3-dev
n3.4-dev
n3.5-dev
n4.*
n4.1-dev
n4.2-dev
n4.3-dev

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-3566.json"
vanir_signatures 
[
    {
        "digest": {
            "line_hashes": [
                "87847563956555810086109357068916520368",
                "179033659746351296284011130959867098470",
                "29912285464798826292798173282494127710",
                "149942135119221602751422759954712516314",
                "122614738720108430322534464033586885784",
                "264754942809671600674997705643627881480",
                "46529893056919444838326796542476614873",
                "232657199141909422124284627650612937300",
                "176347224354873379396459371193661897034",
                "324250718937501476783835246937268406065",
                "230021871174800559649899559161600728586",
                "71857368728975087535349751898191175066"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2021-3566-b3a97196",
        "deprecated": false,
        "signature_version": "v1",
        "source": "https://github.com/ffmpeg/ffmpeg/commit/3bce9e9b3ea35c54bacccc793d7da99ea5157532",
        "match_only_versions": [
            "N",
            "n0.11-dev",
            "n0.12-dev",
            "n0.8",
            "n1.1-dev",
            "n1.2-dev",
            "n1.3-dev",
            "n2.0",
            "n2.1-dev",
            "n2.2-dev",
            "n2.3-dev",
            "n2.4-dev",
            "n2.5-dev",
            "n2.6-dev",
            "n2.7-dev",
            "n2.8-dev",
            "n2.9-dev",
            "n3.1-dev",
            "n3.2-dev",
            "n3.3-dev",
            "n3.4-dev",
            "n3.5-dev",
            "n4.1-dev",
            "n4.2-dev",
            "n4.3-dev"
        ],
        "signature_type": "Line",
        "target": {
            "file": "libavformat/tty.c"
        }
    }
]
vanir_signatures_modified 
"2026-08-18T14:05:42Z"