Vulnerability Database

328,409

Total vulnerabilities in the database

CVE-2021-22320

There is a denial of service vulnerability in Huawei products. A module cannot deal with specific messages correctly. Attackers can exploit this vulnerability by sending malicious messages to an affected module. This can lead to denial of service. Affected product include some versions of IPS Module, NGFW Module, NIP6600, NIP6800, Secospace USG6300, Secospace USG6500 and Secospace USG6600.

  • Published: Mar 22, 2021
  • Updated: Nov 16, 2025
  • CVE: CVE-2021-22320
  • Severity: High
  • Exploit:

CVSS v3:

  • Severity: High
  • Score: 7.5
  • AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v2:

  • Severity: Medium
  • Score: 5
  • AV:N/AC:L/Au:N/C:N/I:N/A:P

No CWE or OWASP classifications available.

Software From Fixed in
huawei / ips_module_firmware 500r005c00spc100 500r005c00spc100.x
huawei / ips_module_firmware 500r005c00spc200 500r005c00spc200.x
huawei / ips_module_firmware 500r005c20spc300 500r005c20spc300.x
huawei / ngfw_module_firmware 500r005c00spc100 500r005c00spc100.x
huawei / ngfw_module_firmware 500r005c00spc200 500r005c00spc200.x
huawei / ngfw_module_firmware 500r005c20spc300 500r005c20spc300.x
huawei / nip6600_firmware 500r001c30spc200 500r001c30spc200.x
huawei / nip6600_firmware 500r001c30spc600 500r001c30spc600.x
huawei / nip6600_firmware 500r001c60spc500 500r001c60spc500.x
huawei / nip6600_firmware 500r005c00spc100 500r005c00spc100.x
huawei / nip6600_firmware 500r005c00spc200 500r005c00spc200.x
huawei / nip6600_firmware 500r005c20spc300 500r005c20spc300.x
huawei / nip6600_firmware 500r005c20spc500 500r005c20spc500.x
huawei / nip6800_firmware 500r001c60spc500 500r001c60spc500.x
huawei / nip6800_firmware 500r005c00spc100 500r005c00spc100.x
huawei / nip6800_firmware 500r005c00spc200 500r005c00spc200.x
huawei / nip6800_firmware 500r005c20spc300 500r005c20spc300.x
huawei / nip6800_firmware 500r005c20spc500 500r005c20spc500.x
huawei / secospace_usg6300_firmware 500r001c30spc200 500r001c30spc200.x
huawei / secospace_usg6300_firmware 500r001c30spc600 500r001c30spc600.x
huawei / secospace_usg6300_firmware 500r001c60spc500 500r001c60spc500.x
huawei / secospace_usg6300_firmware 500r005c00spc100 500r005c00spc100.x
huawei / secospace_usg6300_firmware 500r005c00spc200 500r005c00spc200.x
huawei / secospace_usg6300_firmware 500r005c20spc300 500r005c20spc300.x
huawei / secospace_usg6300_firmware 500r005c20spc500 500r005c20spc500.x
huawei / secospace_usg6500_firmware 500r001c30spc200 500r001c30spc200.x
huawei / secospace_usg6500_firmware 500r001c30spc600 500r001c30spc600.x
huawei / secospace_usg6500_firmware 500r001c60spc500 500r001c60spc500.x
huawei / secospace_usg6500_firmware 500r005c00spc100 500r005c00spc100.x
huawei / secospace_usg6500_firmware 500r005c00spc200 500r005c00spc200.x
huawei / secospace_usg6500_firmware 500r005c20spc300 500r005c20spc300.x
huawei / secospace_usg6500_firmware 500r005c20spc500 500r005c20spc500.x
huawei / secospace_usg6600_firmware 500r001c30spc200 500r001c30spc200.x
huawei / secospace_usg6600_firmware 500r001c30spc600 500r001c30spc600.x
huawei / secospace_usg6600_firmware 500r001c60spc500 500r001c60spc500.x
huawei / secospace_usg6600_firmware 500r005c00spc100 500r005c00spc100.x
huawei / secospace_usg6600_firmware 500r005c00spc200 500r005c00spc200.x
huawei / secospace_usg6600_firmware 500r005c20spc300 500r005c20spc300.x
huawei / secospace_usg6600_firmware 500r005c20spc500 500r005c20spc500.x

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.