CVE-2020-12457

HIGH

wolfSSL <4.5.0 - DoS

Title source: llm

Description

An issue was discovered in wolfSSL before 4.5.0. It mishandles the change_cipher_spec (CCS) message processing logic for TLS 1.3. If an attacker sends ChangeCipherSpec messages in a crafted way involving more than one in a row, the server becomes stuck in the ProcessReply() loop, i.e., a denial of service.

References (2)

[Patch, Third Party Advisory] https://github.com/wolfSSL/wolfssl/pull/2927

[Third Party Advisory] https://github.com/wolfSSL/wolfssl/releases/tag/v4.5.0-stable

Scores

CVSS v3 7.5

EPSS 0.0047

EPSS Percentile 64.6%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Details

CWE

CWE-835

Status published

Products (1)

wolfssl/wolfssl < 4.5.0

Published Aug 21, 2020

Tracked Since Feb 18, 2026