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Security Advisory - Traffic Hijacking Vulnerability in Huawei Routers

  • SA No:huawei-sa-20220831-01-5370a6df
  • Initial Release Date: Aug 31, 2022
  • Last Release Date: Aug 31, 2022

There is a traffic hijacking vulnerability in Huawei routers. Successful exploitation of this vulnerability can cause packets to be hijacked by attackers. (Vulnerability ID: HWPSIRT-2021-21766)

This vulnerability has been assigned a Common Vulnerabilities and Exposures (CVE) ID: CVE-2021-46835.

For products that have released software updates to fix this vulnerability, Huawei will release and update the Security Advisory at:

Affected Product

Affected Version

Resolved Version


Successful exploitation of this vulnerability can cause packets to be hijacked by attackers.

Vulnerability Scoring Details

The vulnerability classification has been performed by using the CVSSv3 scoring system (

Base Score: 6.3 (AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L)

Temporal Score: 5.9 (E:F/RL:O/RC:C)

This vulnerability can be exploited only when the following conditions are present:

Attackers can access devices within the LAN.

Vulnerability details:

There is a traffic hijacking vulnerability in Huawei routers due to improper ICMP packet processing. An attacker who can access the device on a LAN can construct malicious ICMP packets and send them to the victim to exploit this vulnerability. Successful exploitation of this vulnerability can lead to packet hijacking.

Customers should contact Huawei TAC (Huawei Technical Assistance Center) to request the upgrades. For TAC contact information, please refer to Huawei worldwide website at

This vulnerability was discovered by Huawei internal tester.

2022-08-31 V1.0 INITIAL

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