There is a denial of service vulnerability in the verisions V200R005C00SPC500 of S5700 and V200R005C00SPC500 of S6700. An attacker could exploit this vulnerability by sending specific message to a targeted device. Due to insufficient input validation, successful exploit can cause the service abnormal.
https://therecord.media/huawei-zero-day-behind-last-year-luxembourg-telecom-outage
https://www.huawei.com/en/psirt/security-advisories/huawei-sa-20210519-02-dos-en