Provide references for CVE-2021-4437.
Where can I find more information about CVE-2021-4437?
References are available at: https://vuldb.com/?id.253406, https://vuldb.com/?ctiid.253406, https://github.com/dbartholomae/lambda-middleware/pull/57, https://github.com/dbartholomae/lambda-middleware/commit/f689404d830cbc1edd6a1018d3334ff5f44dc6a6, https://github.com/dbartholomae/lambda-middleware/releases/tag/%40lambda-middleware%2Fframeguard_v1.1.0.