Vulnerability Details : CVE-2020-12457
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.
Vulnerability category: Denial of service
Products affected by CVE-2020-12457
- cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-12457
0.47%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 62 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-12457
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:N/A:P |
10.0
|
2.9
|
NIST | |
|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
NIST |
CWE ids for CVE-2020-12457
-
The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.Assigned by: nvd@nist.gov (Primary)
References for CVE-2020-12457
-
https://github.com/wolfSSL/wolfssl/releases/tag/v4.5.0-stable
Release wolfSSL Release 4.5.0 (08/19/2020) · wolfSSL/wolfssl · GitHubThird Party Advisory
-
https://github.com/wolfSSL/wolfssl/pull/2927
In TLS 1.3, don't allow multiple ChangeCipherSpecs in a row by SparkiDev · Pull Request #2927 · wolfSSL/wolfssl · GitHubPatch;Third Party Advisory
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