CVE-2021-38171

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Source
https://cve.org/CVERecord?id=CVE-2021-38171
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-38171.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-38171
Downstream
Related
Published
2021-08-21T17:15:07.700Z
Modified
2026-07-08T22:13:51.873679Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

adtsdecodeextradata in libavformat/adtsenc.c in FFmpeg 4.4 does not check the initgetbits return value, which is a necessary step because the second argument to initgetbits can be crafted.

Database specific 
{
    "unresolved_ranges": [
        {
            "source": "CPE_STRING",
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
                {
                    "introduced": "9.0"
                },
                {
                    "last_affected": "9.0"
                },
                {
                    "introduced": "10.0"
                },
                {
                    "last_affected": "10.0"
                },
                {
                    "introduced": "11.0"
                },
                {
                    "last_affected": "11.0"
                }
            ],
            "cpes": [
                "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
                "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*",
                "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
            ]
        }
    ]
}
References

Affected packages

Git / git.ffmpeg.org/ffmpeg.git

Affected ranges

Type
GIT
Repo
https://git.ffmpeg.org/ffmpeg.git
Events
Introduced
c5079bf3bccd24bf8ed45ff47ff4071fd09e9fd8
Last affected
c5079bf3bccd24bf8ed45ff47ff4071fd09e9fd8
Database specific 
{
    "source": "CPE_STRING",
    "cpe": "cpe:2.3:a:ffmpeg:ffmpeg:4.4:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "4.4"
        },
        {
            "last_affected": "4.4"
        }
    ]
}

Affected versions

4.*
4.4
n4.*
n4.4-dev

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-38171.json"

Git / github.com/ffmpeg/ffmpeg

Affected ranges

Type
GIT
Repo
https://github.com/ffmpeg/ffmpeg
Events
Introduced
c5079bf3bccd24bf8ed45ff47ff4071fd09e9fd8
Last affected
c5079bf3bccd24bf8ed45ff47ff4071fd09e9fd8
Fixed
9ffa49496d1aae4cbbb387aac28a9e061a6ab0a6
Database specific 
{
    "source": [
        "CPE_STRING",
        "REFERENCES"
    ],
    "cpe": "cpe:2.3:a:ffmpeg:ffmpeg:4.4:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "4.4"
        },
        {
            "last_affected": "4.4"
        }
    ]
}

Affected versions

4.*
4.4
n4.*
n4.4-dev
n4.5-dev

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-38171.json"
vanir_signatures 
[
    {
        "id": "CVE-2021-38171-e3cbe9ce",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/ffmpeg/ffmpeg/commit/9ffa49496d1aae4cbbb387aac28a9e061a6ab0a6",
        "deprecated": false,
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "340113475355395989559555410026913520501",
                "137990287974201680121919945555266282413",
                "104727278381930846197606427839919055206",
                "306440550592068726656414586700004213449",
                "111695304590519358973522263762808409562"
            ]
        },
        "target": {
            "file": "libavformat/adtsenc.c"
        }
    },
    {
        "id": "CVE-2021-38171-e6f862de",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/ffmpeg/ffmpeg/commit/9ffa49496d1aae4cbbb387aac28a9e061a6ab0a6",
        "deprecated": false,
        "digest": {
            "function_hash": "220551853458764014735923732241586144836",
            "length": 1445.0
        },
        "target": {
            "function": "adts_decode_extradata",
            "file": "libavformat/adtsenc.c"
        }
    }
]
vanir_signatures_modified 
"2026-07-08T22:13:51Z"