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

{
    "versions": [
        {
            "introduced": "2.0.0"
        },
        {
            "last_affected": "2.0.18"
        }
    ]
}

Database specific

vanir_signatures_modified

"2026-04-11T17:26:01Z"

source

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

vanir_signatures

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    {
        "deprecated": false,
        "signature_type": "Function",
        "id": "CVE-2021-33657-493fc812",
        "source": "https://github.com/libsdl-org/sdl/commit/8c91cf7dba5193f5ce12d06db1336515851c9ee9",
        "signature_version": "v1",
        "target": {
            "file": "src/video/SDL_pixels.c",
            "function": "Map1to1"
        },
        "digest": {
            "length": 673.0,
            "function_hash": "135559890956021690986487977211098728481"
        }
    },
    {
        "id": "CVE-2021-33657-52cbc3ff",
        "signature_type": "Function",
        "source": "https://github.com/libsdl-org/sdl/commit/8c91cf7dba5193f5ce12d06db1336515851c9ee9",
        "deprecated": false,
        "signature_version": "v1",
        "target": {
            "file": "src/video/SDL_pixels.c",
            "function": "Map1toN"
        },
        "digest": {
            "length": 860.0,
            "function_hash": "120029847142050598506380381411279339480"
        }
    },
    {
        "deprecated": false,
        "signature_type": "Line",
        "id": "CVE-2021-33657-795aa1c9",
        "source": "https://github.com/libsdl-org/sdl/commit/8c91cf7dba5193f5ce12d06db1336515851c9ee9",
        "target": {
            "file": "src/video/SDL_pixels.c"
        },
        "signature_version": "v1",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
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        }
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]