Vulnerability Database

383,426

Total vulnerabilities in the database

CVE-2021-22321 — huawei / nip6300_firmware

Use After Free

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: Sep 13, 2026
  • CVE: CVE-2021-22321
  • Severity: Medium
  • Exploit:
  • CISA KEV:

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 Affected versions
huawei / nip6300_firmware = 500r001c30
huawei / nip6300_firmware = 500r001c60
huawei / nip6600_firmware = 500r001c30
huawei / nip6800_firmware = 500r001c60
huawei / s12700_firmware = 200r007c01
huawei / s12700_firmware = 200r007c01b102
huawei / s12700_firmware = 200r008c00
huawei / s12700_firmware = 200r010c00
huawei / s12700_firmware = 200r010c00spc300
huawei / s12700_firmware = 200r011c00
huawei / s12700_firmware = 200r011c00spc100
huawei / s12700_firmware = 200r011c10
huawei / s1700_firmware = 200r009c00spc200
huawei / s1700_firmware = 200r009c00spc500
huawei / s1700_firmware = 200r010c00
huawei / s1700_firmware = 200r010c00spc300
huawei / s1700_firmware = 200r011c00
huawei / s1700_firmware = 200r011c00spc100
huawei / s1700_firmware = 200r011c10
huawei / s2700_firmware = 200r008c00
huawei / s2700_firmware = 200r010c00
huawei / s2700_firmware = 200r010c00spc300
huawei / s2700_firmware = 200r011c00
huawei / s2700_firmware = 200r011c00spc100
huawei / s2700_firmware = 200r011c10
huawei / s5700_firmware = 200r008c00
huawei / s5700_firmware = 200r010c00
huawei / s5700_firmware = 200r010c00spc300
huawei / s5700_firmware = 200r011c00
huawei / s5700_firmware = 200r011c00spc100
huawei / s5700_firmware = 200r011c10
huawei / s5700_firmware = 200r011c10spc100
huawei / s6700_firmware = 200r008c00
huawei / s6700_firmware = 200r010c00
huawei / s6700_firmware = 200r010c00spc300
huawei / s6700_firmware = 200r011c00
huawei / s6700_firmware = 200r011c00spc100
huawei / s6700_firmware = 200r011c10
huawei / s6700_firmware = 200r011c10spc100
huawei / s7700_firmware = 200r008c00
huawei / s7700_firmware = 200r010c00
huawei / s7700_firmware = 200r010c00spc300
huawei / s7700_firmware = 200r011c00
huawei / s7700_firmware = 200r011c00spc100
huawei / s7700_firmware = 200r011c10
huawei / s9700_firmware = 200r007c01
huawei / s9700_firmware = 200r007c01b102
huawei / s9700_firmware = 200r008c00
huawei / s9700_firmware = 200r010c00
huawei / s9700_firmware = 200r010c00spc300
huawei / s9700_firmware = 200r011c00
huawei / s9700_firmware = 200r011c00spc100
huawei / s9700_firmware = 200r011c10
huawei / secospace_usg6300_firmware = 500r001c30
huawei / secospace_usg6300_firmware = 500r001c60
huawei / secospace_usg6500_firmware = 500r001c30
huawei / secospace_usg6500_firmware = 500r001c60
huawei / secospace_usg6600_firmware = 500r001c30
huawei / secospace_usg6600_firmware = 500r001c60
huawei / usg9500_firmware = 500r001c30
huawei / usg9500_firmware = 500r001c60

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.