{"id":"PUB-A-172716941", "published":"2021-06-01T00:00:00Z", "modified":"2026-09-14T15:29:34.961045646Z", "aliases":["CVE-2021-0556", "A-172716941"], "details":"In getBlockSum of fastcodemb.cpp, there is a possible out of bounds read due to a heap buffer overflow. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.", "affected":[{"package":{"name":"platform/frameworks/av", "ecosystem":"Android"}, "ranges":[{"type":"ECOSYSTEM", "events":[{"introduced":"11:0"}, {"fixed":"11:2021-06-01"}]}], "versions":["11"], "ecosystem_specific":{"fixes":["https://android.googlesource.com/platform/frameworks/av/+/4a8f9e81f1a3a68997640901c9609ac4aea70f8b"], "severity":"Moderate", "spl":"2021-06-01", "types":["ID"], "vanir_signatures":[{"deprecated":false, "digest":{"line_hashes":["300585093410639656505867506267845368856", "17267186837245124185419382308300513777", "294294871855883533675667540792231867578", "105031559810947757209742234609958146026"], "threshold":0.9}, "id":"PUB-A-172716941-04ac8281", "signature_type":"Line", "signature_version":"v1", "source":"https://android.googlesource.com/platform/frameworks/av/+/4a8f9e81f1a3a68997640901c9609ac4aea70f8b", "target":{"file":"media/libstagefright/codecs/m4v_h263/enc/src/mp4enc_api.cpp"}}, {"deprecated":false, "digest":{"function_hash":"127043776089505450809936863600186662559", "length":20236}, "id":"PUB-A-172716941-1c4b7f2b", "signature_type":"Function", "signature_version":"v1", "source":"https://android.googlesource.com/platform/frameworks/av/+/4a8f9e81f1a3a68997640901c9609ac4aea70f8b", "target":{"file":"media/libstagefright/codecs/m4v_h263/enc/src/mp4enc_api.cpp", "function":"PVInitVideoEncoder"}}]}}], "references":[{"type":"ADVISORY", "url":"https://source.android.com/security/bulletin/2021-06-01"}, {"type":"FIX", "url":"https://android.googlesource.com/platform/frameworks/av/+/4a8f9e81f1a3a68997640901c9609ac4aea70f8b"}]}