CVE-2020-12457

HIGH

wolfssl < 4.5.0 - Denial of Service via TLS 1.3 ChangeCipherSpec Message Processing

Title source: llm
STIX 2.1

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)

Core 2
Core References
Patch, Third Party Advisory x_refsource_misc
https://github.com/wolfSSL/wolfssl/pull/2927
Third Party Advisory x_refsource_confirm
https://github.com/wolfSSL/wolfssl/releases/tag/v4.5.0-stable

Scores

CVSS v3 7.5
EPSS 0.0153
EPSS Percentile 71.4%
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