Vulnerability Database

328,409

Total vulnerabilities in the database

CVE-2021-22321

There is a use-after-free vulnerability in a Huawei product. A module cannot deal with specific operations in special scenarios. Attackers can exploit this vulnerability by performing malicious operations. This can cause memory use-after-free, compromising normal service. Affected product include some versions of NIP6300, NIP6600, NIP6800, S1700, S2700, S5700, S6700 , S7700, S9700, Secospace USG6300, Secospace USG6500, Secospace USG6600 and USG9500.

  • Published: Mar 22, 2021
  • Updated: Nov 16, 2025
  • CVE: CVE-2021-22321
  • Severity: Medium
  • Exploit:

CVSS v3:

  • Severity: Medium
  • Score: 5.3
  • AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS v2:

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

CWEs:

Software From Fixed in
huawei / nip6300_firmware 500r001c30 500r001c30.x
huawei / nip6300_firmware 500r001c60 500r001c60.x
huawei / nip6600_firmware 500r001c30 500r001c30.x
huawei / nip6800_firmware 500r001c60 500r001c60.x
huawei / s12700_firmware 200r007c01 200r007c01.x
huawei / s12700_firmware 200r007c01b102 200r007c01b102.x
huawei / s12700_firmware 200r008c00 200r008c00.x
huawei / s12700_firmware 200r010c00 200r010c00.x
huawei / s12700_firmware 200r010c00spc300 200r010c00spc300.x
huawei / s12700_firmware 200r011c00 200r011c00.x
huawei / s12700_firmware 200r011c00spc100 200r011c00spc100.x
huawei / s12700_firmware 200r011c10 200r011c10.x
huawei / s1700_firmware 200r009c00spc200 200r009c00spc200.x
huawei / s1700_firmware 200r009c00spc500 200r009c00spc500.x
huawei / s1700_firmware 200r010c00 200r010c00.x
huawei / s1700_firmware 200r010c00spc300 200r010c00spc300.x
huawei / s1700_firmware 200r011c00 200r011c00.x
huawei / s1700_firmware 200r011c00spc100 200r011c00spc100.x
huawei / s1700_firmware 200r011c10 200r011c10.x
huawei / s2700_firmware 200r008c00 200r008c00.x
huawei / s2700_firmware 200r010c00 200r010c00.x
huawei / s2700_firmware 200r010c00spc300 200r010c00spc300.x
huawei / s2700_firmware 200r011c00 200r011c00.x
huawei / s2700_firmware 200r011c00spc100 200r011c00spc100.x
huawei / s2700_firmware 200r011c10 200r011c10.x
huawei / s5700_firmware 200r008c00 200r008c00.x
huawei / s5700_firmware 200r010c00 200r010c00.x
huawei / s5700_firmware 200r010c00spc300 200r010c00spc300.x
huawei / s5700_firmware 200r011c00 200r011c00.x
huawei / s5700_firmware 200r011c00spc100 200r011c00spc100.x
huawei / s5700_firmware 200r011c10 200r011c10.x
huawei / s5700_firmware 200r011c10spc100 200r011c10spc100.x
huawei / s6700_firmware 200r008c00 200r008c00.x
huawei / s6700_firmware 200r010c00 200r010c00.x
huawei / s6700_firmware 200r010c00spc300 200r010c00spc300.x
huawei / s6700_firmware 200r011c00 200r011c00.x
huawei / s6700_firmware 200r011c00spc100 200r011c00spc100.x
huawei / s6700_firmware 200r011c10 200r011c10.x
huawei / s6700_firmware 200r011c10spc100 200r011c10spc100.x
huawei / s7700_firmware 200r008c00 200r008c00.x
huawei / s7700_firmware 200r010c00 200r010c00.x
huawei / s7700_firmware 200r010c00spc300 200r010c00spc300.x
huawei / s7700_firmware 200r011c00 200r011c00.x
huawei / s7700_firmware 200r011c00spc100 200r011c00spc100.x
huawei / s7700_firmware 200r011c10 200r011c10.x
huawei / s9700_firmware 200r007c01 200r007c01.x
huawei / s9700_firmware 200r007c01b102 200r007c01b102.x
huawei / s9700_firmware 200r008c00 200r008c00.x
huawei / s9700_firmware 200r010c00 200r010c00.x
huawei / s9700_firmware 200r010c00spc300 200r010c00spc300.x
huawei / s9700_firmware 200r011c00 200r011c00.x
huawei / s9700_firmware 200r011c00spc100 200r011c00spc100.x
huawei / s9700_firmware 200r011c10 200r011c10.x
huawei / secospace_usg6300_firmware 500r001c30 500r001c30.x
huawei / secospace_usg6300_firmware 500r001c60 500r001c60.x
huawei / secospace_usg6500_firmware 500r001c30 500r001c30.x
huawei / secospace_usg6500_firmware 500r001c60 500r001c60.x
huawei / secospace_usg6600_firmware 500r001c30 500r001c30.x
huawei / secospace_usg6600_firmware 500r001c60 500r001c60.x
huawei / usg9500_firmware 500r001c30 500r001c30.x
huawei / usg9500_firmware 500r001c60 500r001c60.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.