Integer Underflow Leads to Out-of-Bounds Access in XChaCha20-Poly1305 Decrypt. This issue is hit specifically with a call to the function wc_XChaCha20Poly1305_Decrypt() which is not used with TLS connections, only from direct calls from an application.
Exploitability
AV:NAC:LAT:PPR:NUI:AVulnerable System
VC:LVI:LVA:NSubsequent System
SC:LSI:LSA:N2.1/CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:NOther