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Vulnerability record · CVE-2021-22321 · published 22 March 2021

CVE-2021-22321: Huawei nip6300 firmware use after free vulnerability

Huawei · Nip6300 Firmware

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.

5.3 CVSS 3.1 Medium EPSS 0.74% · top 46.2% CWE-416 · Use after free
5.3CVSS 3.1 base score, v2 5.0
0.74%EPSS exploitation probability, 30 days
NoNot in CISA KEV
14Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected products

14 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.huawei.com/en/psirt/security-advisories/huawei-sa-20210210-01-uaf-en Vendor Advisory
https://www.huawei.com/en/psirt/security-advisories/huawei-sa-20210210-01-uaf-en Vendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-22321), CISA KEV, FIRST EPSS (scores of 2026-10-17). This page is refreshed as NVD updates the record.