CVE-2020-12457
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductWolfssl
PublishedAug 21, 2020
First seenAug 21, 2020
How to fix
Update
- wolfssl wolfssl4.5.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| wolfssl wolfssl | v < 4.5.0 | 4.5.0 |
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