Incorrect handshake in TinyDTLS

[Meng Ruijie <ruijie_meng () u nus edu>]

About CVE-2021-42141:

[Suggested description]
An issue was discovered in Contiki-NG tinyDTLS through 2018-08-30. One incorrect handshake could complete with 
different epoch numbers in the packets Client_Hello, Client_key_exchange, and Change_cipher_spec, which may cause 
denial of service.

[VulnerabilityType Other]
Improper Handling of exception conditions

[Vendor of Product]
https://github.com/contiki-ng/tinydtls

[Affected Product Code Base]
contiki-ng tinydtls - master branch 53a0d97

[Affected Component]
the service of dtls servers

[Attack Type]
Remote

[Impact Code execution]
true

[Impact Denial of Service]
true

[Impact Information Disclosure]
true

[Reference]
https://github.com/contiki-ng/tinydtls/issues/27

[Discoverer]
jerrytesting
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