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Security Advisory - TLS Certificate Verification Vulnerability in Huawei 7900 IP Phones

  • SA No:huawei-sa-20190724-01-7900
  • Initial Release Date: Jul 24, 2019
  • Last Release Date: Jul 24, 2019

There is a TLS certificate verification vulnerability in the SIP TLS module of Huawei 7900 IP Phones. Due to insufficient verification of specific parameters of the TLS server certificate, attackers can perform man-in-the-middle attacks, leading to the affected phones registered abnormally, affecting the availability of IP phones. (Vulnerability ID: HWPSIRT-2019-02212)

This vulnerability has been assigned a Common Vulnerabilities and Exposures (CVE) ID: CVE-2019-5280.

Huawei has released software updates to fix this vulnerability. This advisory is available at the following link:

http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20190724-01-7900-en


Product Name

Affected Version

Resolved Product and Version

CloudLink Phone 7900

V600R019C10

V600R019C10SPC200


The attacker can exploit this vulnerability to cause affected phones registered abnormally, affecting the availability of IP phones.


The vulnerability classification has been performed by using the CVSSv3 scoring system (http://www.first.org/cvss/specification-document).

Base Score: 6.5 (AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H)

Temporal Score: 6.0 (E:F/RL:O/RC:C)

Overall Score: 6.0


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

The attacker can intercept the communication data between the two communication parties.

Vulnerability details:

Due to insufficient verification of specific parameters of the TLS server certificate, attackers can perform man-in-the-middle attacks, leading to the affected phones registered abnormally, affecting the availability of IP phones.


Customers should contact Huawei TAC (Huawei Technical Assistance Center) to request the upgrades. For TAC contact information, please refer to Huawei worldwide website at http://www.huawei.com/en/psirt/report-vulnerabilities.

This vulnerability was reported to Huawei PSIRT by security researcher Alexander Traud. Huawei would like to thank Alexander Traud for working with us and coordinated vulnerability disclosure to protect our customers.


2019-07-24 V1.0 INITIAL


Huawei adheres to protecting the ultimate interests of users with best efforts and the principle of responsible disclosure and deal with product security issues through our response mechanism.

To enjoy Huawei PSIRT services and obtain Huawei product vulnerability information, please visit http://www.huawei.com/en/psirt.

To report a security vulnerability in Huawei products and solutions, please send it to PSIRT@huawei.com. For details, please visit http://www.huawei.com/en/psirt/report-vulnerabilities.

This document is provided on an "AS IS" basis and does not imply any kind of guarantee or warranty, either express or implied, including the warranties of merchantability or fitness for a particular purpose. In no event shall Huawei or any of its directly or indirectly controlled subsidiaries or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages. Your use of the document, by whatsoever means, will be totally at your own risk. Huawei is entitled to amend or update this document from time to time.