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Security Advisory - Buffer Overflow Vulnerability in Huawei Several Products

  • SA No:huawei-sa-20160511-01-dns
  • Initial Release Date: May 11, 2016
  • Last Release Date: May 18, 2016

There is a vulnerability in several Huawei devices: USG series and NGFW Module.

These products have a buffer overflow vulnerability in the Smart DNS function. An attacker may craft a malformed packet with illegitimate parameters, leading to denial of service or the potential execution of arbitrary code. (Vulnerability ID: HWPSIRT-2016-04006)

This vulnerability has been assigned Common Vulnerabilities and Exposures (CVE) ID: CVE-2016-4577.

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

Product Name

Affected Version

Resolved Product and Version

NGFW Module


Upgrade to V500R001C20SPC100

Secospace USG6300


Upgrade to V500R001C20SPC100

Secospace USG6500


Upgrade to V500R001C20SPC100

Secospace USG6600


Upgrade to V500R001C20SPC100



Upgrade to V500R001C20SPC100

An attacker may exploit this vulnerability by crafting a malformed packet. An exploit could allow the attacker to cause a Denial of Service or execute arbitrary code.

The vulnerability classification has been performed by using the CVSSv2 scoring system (

Base Score: 6.8 (AV:A/AC:H/Au:N/C:C/I:C/A:C)

Temporal Score: 5.6 (E:F/RL:O/RC:C)


  1. The attacker gains access to the device network.
  2. The Smart DNS function is active.


Attacking procedure:

Since the system does not verify the parameters, the attacker may craft a malformed packet with illegitimate parameters in the Smart DNS function, leading to denial of service or the potential execution of arbitrary code.

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.

2016-05-18 V1.1 UPDATED Assigned a CVE ID to the vulnerability

2016-05-11 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.

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