Description
An issue was discovered in Botan 1.11.32 through 2.x before 2.6.0. An off-by-one error when processing malformed TLS-CBC ciphertext could cause the receiving side to include in the HMAC computation exactly 64K bytes of data following the record buffer, aka an over-read. The MAC comparison will subsequently fail and the connection will be closed. This could be used for denial of service. No information leak occurs.
Scores
CVSS v3
7.5
EPSS
0.0050
EPSS Percentile
66.0%
Attack Vector
NETWORK
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Details
CWE
CWE-193
Status
published
Products (1)
botan_project/botan
1.11.32 - 2.6.0
Published
Apr 12, 2018
Tracked Since
Feb 18, 2026