CVE-2020-12457
7.5
HIGH
CVSS 3.1
EPSS 0.47%
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.
How to fix CVE-2020-12457
To remediate CVE-2020-12457, upgrade the affected package to a fixed version below.
- Debian/wolfssl—upgrade to 4.5.0+dfsg-1 or later
Is CVE-2020-12457 being exploited?
Low — EPSS is 0.5%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 4.5.0+dfsg-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |