{"id":"PUB-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.","aliases":["A-172716941","CVE-2021-0556"],"modified":"2026-09-21T16:00:45.521740994Z","published":"2021-06-01T00:00:00Z","references":[{"type":"ADVISORY","url":"https://source.android.com/security/bulletin/2021-06-01"},{"type":"FIX","url":"https://android.googlesource.com/platform/frameworks/av/+/4a8f9e81f1a3a68997640901c9609ac4aea70f8b"}],"affected":[{"package":{"name":"platform/frameworks/av","ecosystem":"Android"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"11:0"},{"fixed":"11:2021-06-01"}]}],"versions":["11"],"ecosystem_specific":{"severity":"Moderate","spl":"2021-06-01","types":["ID"],"vanir_signatures":[{"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":{"line_hashes":["300585093410639656505867506267845368856","17267186837245124185419382308300513777","294294871855883533675667540792231867578","105031559810947757209742234609958146026"],"threshold":0.9},"id":"PUB-A-172716941-04ac8281"},{"digest":{"length":20236,"function_hash":"127043776089505450809936863600186662559"},"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"},"deprecated":false}],"fixes":["https://android.googlesource.com/platform/frameworks/av/+/4a8f9e81f1a3a68997640901c9609ac4aea70f8b"]},"database_specific":{"source":"https://storage.googleapis.com/android-osv/PUB-A-172716941.json"}}],"schema_version":"1.9.0"}