S2N Quic
Monthly
Denial of service in AWS s2n-quic 1.88.0 and earlier allows an unauthenticated remote attacker to shut down a QUIC server endpoint by sending a single crafted UDP datagram that carries a Destination Connection ID of invalid length, which the library fails to validate properly. The impact is limited to server endpoints specifically configured to send QUIC Retry packets (servers that never emit Retry packets are not affected), and the CVSS:3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) confirms a full availability loss with no confidentiality or integrity impact and no authentication or user interaction required. There is no indication of confirmed active exploitation (no CISA KEV listing) and no public exploit code identified at time of analysis, but the low attack complexity and single-packet nature of the trigger make the configuration prerequisite the key scoping factor. Vendor-released patch: v1.89.0.
Unbounded memory allocation in the CRYPTO frame reassembler of AWS s2n-quic (all versions before v1.82.0) enables unauthenticated remote actors to degrade service availability by sending crafted QUIC Initial packets. Because QUIC Initial packets are processed prior to handshake completion, no session establishment or authentication is required to trigger the condition. No public exploit code or active exploitation has been identified at time of analysis, but the low-complexity, zero-authentication attack path makes this straightforwardly reachable on any exposed s2n-quic endpoint.
Denial of service in AWS s2n-quic 1.88.0 and earlier allows an unauthenticated remote attacker to shut down a QUIC server endpoint by sending a single crafted UDP datagram that carries a Destination Connection ID of invalid length, which the library fails to validate properly. The impact is limited to server endpoints specifically configured to send QUIC Retry packets (servers that never emit Retry packets are not affected), and the CVSS:3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) confirms a full availability loss with no confidentiality or integrity impact and no authentication or user interaction required. There is no indication of confirmed active exploitation (no CISA KEV listing) and no public exploit code identified at time of analysis, but the low attack complexity and single-packet nature of the trigger make the configuration prerequisite the key scoping factor. Vendor-released patch: v1.89.0.
Unbounded memory allocation in the CRYPTO frame reassembler of AWS s2n-quic (all versions before v1.82.0) enables unauthenticated remote actors to degrade service availability by sending crafted QUIC Initial packets. Because QUIC Initial packets are processed prior to handshake completion, no session establishment or authentication is required to trigger the condition. No public exploit code or active exploitation has been identified at time of analysis, but the low-complexity, zero-authentication attack path makes this straightforwardly reachable on any exposed s2n-quic endpoint.