How severe is CVE-2021-22321?

CVE-2021-22321 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2021-22321 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-22321?

CVE-2021-22321 primarily affects Huawei Nip6300 Firmware. In total, 61 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-22321?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-22321 published?

CVE-2021-22321 was published on 2021-03-22 and last updated on 2026-06-17.

CVE-2021-22321

CVE-2021-22321 is a medium-severity vulnerability in Huawei Nip6300 Firmware with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-416.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-416
Affected product: Huawei Nip6300 Firmware
Published: 2021-03-22
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2021-22321?: CVE-2021-22321 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2021-22321 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-22321?: CVE-2021-22321 primarily affects Huawei Nip6300 Firmware. In total, 61 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-22321?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-22321 published?: CVE-2021-22321 was published on 2021-03-22 and last updated on 2026-06-17.

References

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

Affected products (61)

cpe:2.3:o:huawei:nip6300_firmware:v500r001c30:*:*:*:*:*:*:*
cpe:2.3:o:huawei:nip6300_firmware:v500r001c60:*:*:*:*:*:*:*
cpe:2.3:o:huawei:nip6600_firmware:v500r001c30:*:*:*:*:*:*:*
cpe:2.3:o:huawei:nip6800_firmware:v500r001c60:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s12700_firmware:v200r007c01:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s12700_firmware:v200r007c01b102:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s12700_firmware:v200r008c00:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s12700_firmware:v200r010c00:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s12700_firmware:v200r010c00spc300:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s12700_firmware:v200r011c00:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s12700_firmware:v200r011c00spc100:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s12700_firmware:v200r011c10:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s1700_firmware:v200r009c00spc200:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s1700_firmware:v200r009c00spc500:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s1700_firmware:v200r010c00:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s1700_firmware:v200r010c00spc300:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s1700_firmware:v200r011c00:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s1700_firmware:v200r011c00spc100:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s1700_firmware:v200r011c10:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s2700_firmware:v200r008c00:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s2700_firmware:v200r010c00:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s2700_firmware:v200r010c00spc300:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s2700_firmware:v200r011c00:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s2700_firmware:v200r011c00spc100:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s2700_firmware:v200r011c10:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s5700_firmware:v200r008c00:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s5700_firmware:v200r010c00:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s5700_firmware:v200r010c00spc300:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s5700_firmware:v200r011c00:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s5700_firmware:v200r011c00spc100:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s5700_firmware:v200r011c10:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s5700_firmware:v200r011c10spc100:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s6700_firmware:v200r008c00:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s6700_firmware:v200r010c00:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s6700_firmware:v200r010c00spc300:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s6700_firmware:v200r011c00:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s6700_firmware:v200r011c00spc100:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s6700_firmware:v200r011c10:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s6700_firmware:v200r011c10spc100:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s7700_firmware:v200r008c00:*:*:*:*:*:*:*

More vulnerabilities in Huawei Nip6300 Firmware

CVE-2020-9099 — Critical (CVSS 9.8): Huawei products IPS Module; NGFW Module; NIP6300; NIP6600; NIP6800; Secospace USG6300; Secospace USG6500; Secospace…
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CVE-2019-5254 — High (CVSS 8.6): Certain Huawei products (AP2000;IPS Module;NGFW Module;NIP6300;NIP6600;NIP6800;S5700;SVN5600;SVN5800;SVN5800-C;SeMG9811;…
CVE-2020-9213 — High (CVSS 7.5): There is a denial of service vulnerability in some huawei products. In specific scenarios, due to the improper handling…
CVE-2020-1847 — High (CVSS 7.5): There is a denial of service vulnerability in some Huawei products. There is no protection against the attack scenario…
CVE-2019-19417 — High (CVSS 7.5): The SIP module of some Huawei products have a denial of service (DoS) vulnerability. A remote attacker could exploit…

All CVEs affecting Huawei Nip6300 Firmware →

Other CWE-416 (Use After Free) vulnerabilities

CVE-2026-13782 — Critical (CVSS 10.0): Use after free in Browser in Google Chrome prior to 150.0.7871.47 allowed a remote attacker who had compromised the…
CVE-2026-4725 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149…
CVE-2026-4688 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox…
CVE-2025-24085 — Critical (CVSS 10.0): A use after free issue was addressed with improved memory management. This issue is fixed in iOS 18.3 and iPadOS 18.3,…
CVE-2024-43102 — Critical (CVSS 10.0): Concurrent removals of certain anonymous shared memory mappings by using the UMTX_SHM_DESTROY sub-request of…
CVE-2021-32495 — Critical (CVSS 10.0): Radare2 has a use-after-free vulnerability in pyc parser's get_none_object function. Attacker can read freed memory…

Browse all CWE-416 (Use After Free) vulnerabilities →