Unknown · Contiki-Ng · CVE-2021-42147
**Name of the Vulnerable Software and Affected Versions**
Contiki-NG tinyDTLS versions through master branch 53a0d97
**Description**
A buffer over-read issue exists in the `dtls sha256 update` function, allowing remote attackers to cause a denial of service via crafted data packets. This issue affects Contiki-NG tinyDTLS, enabling attackers to disrupt service.
**Recommendations**
For Contiki-NG tinyDTLS versions through master branch 53a0d97, as a temporary workaround, consider disabling the `dtls sha256 update` function until a patch is available.
At the moment, there is no information about a newer version that contains a fix for this vulnerability.