A packet of death scenario is possible in mvfst via a specially crafted message during a QUIC session, which causes a crash via a failed assertion. Per QUIC specification, this particular message should be treated as a connection error. This issue affects mvfst versions prior to commit a67083ff4b8dcbb7ee2839da6338032030d712b0 and proxygen versions prior to v2021.03.15.00.
[
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2021-03-13"
}
]
}
]
[
{
"id": "CVE-2021-24029-0ac97656",
"signature_version": "v1",
"source": "https://github.com/facebook/mvfst/commit/a67083ff4b8dcbb7ee2839da6338032030d712b0",
"signature_type": "Line",
"target": {
"file": "quic/server/test/QuicServerTransportTest.cpp"
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"digest": {
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},
"deprecated": false
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{
"id": "CVE-2021-24029-7a401d8f",
"signature_version": "v1",
"source": "https://github.com/facebook/mvfst/commit/a67083ff4b8dcbb7ee2839da6338032030d712b0",
"signature_type": "Function",
"target": {
"file": "quic/server/state/ServerStateMachine.cpp",
"function": "updateHandshakeState"
},
"digest": {
"function_hash": "78808623916694169656464070640371600264",
"length": 2119.0
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"deprecated": false
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{
"id": "CVE-2021-24029-b895e841",
"signature_version": "v1",
"source": "https://github.com/facebook/mvfst/commit/a67083ff4b8dcbb7ee2839da6338032030d712b0",
"signature_type": "Line",
"target": {
"file": "quic/server/state/ServerStateMachine.cpp"
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"digest": {
"threshold": 0.9,
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"2026-04-11T13:53:58Z"
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-24029.json"