CVE-2021-33657

There is a heap overflow problem in video/SDL_pixels.c in SDL (Simple DirectMedia Layer) 2.x to 2.0.18 versions. By crafting a malicious .BMP file, an attacker can cause the application using this library to crash, denial of service or Code execution.

References

Affected packages

Git / github.com/libsdl-org/sdl

Affected ranges

Type

GIT

Repo

https://github.com/libsdl-org/sdl

Events

Introduced

1ad936eb29cf4506a7a103e8288d732f23e9c2b0

Last Affected

2e9821423a237a1206e3c09020778faacfe430be

Fixed

8c91cf7dba5193f5ce12d06db1336515851c9ee9

Database specific

Show details

{
    "extracted_events": [
        {
            "cpe": "cpe:2.3:a:libsdl:simple_directmedia_layer:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "2.0.0"
                },
                {
                    "last_affected": "2.0.18"
                }
            ],
            "source": "CPE_RANGE"
        },
        {
            "range": [
                {
                    "fixed": "8c91cf7dba5193f5ce12d06db1336515851c9ee9"
                }
            ],
            "source": "REFERENCES_COMMIT"
        }
    ]
}

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-33657.json"

vanir_signatures

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    {
        "deprecated": false,
        "digest": {
            "function_hash": "135559890956021690986487977211098728481",
            "length": 673
        },
        "id": "CVE-2021-33657-493fc812",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/libsdl-org/sdl/commit/8c91cf7dba5193f5ce12d06db1336515851c9ee9",
        "target": {
            "file": "src/video/SDL_pixels.c",
            "function": "Map1to1"
        }
    },
    {
        "deprecated": false,
        "digest": {
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            "length": 860
        },
        "id": "CVE-2021-33657-52cbc3ff",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/libsdl-org/sdl/commit/8c91cf7dba5193f5ce12d06db1336515851c9ee9",
        "target": {
            "file": "src/video/SDL_pixels.c",
            "function": "Map1toN"
        }
    },
    {
        "deprecated": false,
        "digest": {
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            "threshold": 0.9
        },
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        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/libsdl-org/sdl/commit/8c91cf7dba5193f5ce12d06db1336515851c9ee9",
        "target": {
            "file": "src/video/SDL_pixels.c"
        }
    }
]

vanir_signatures_modified

"2026-10-20T14:23:26Z"