How severe is CVE-2021-22357?

CVE-2021-22357 has a CVSS 3.x base score of 7.5, rated high 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 high.

Is CVE-2021-22357 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-2021-22357?

CVE-2021-22357 primarily affects Huawei S12700 Firmware. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-22357?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-22357 published?

CVE-2021-22357 was published on 2021-08-23 and last updated on 2026-06-17.

CVE-2021-22357

CVE-2021-22357 is a high-severity vulnerability in Huawei S12700 Firmware with a CVSS 3.x base score of 7.5. 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-20.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Huawei S12700 Firmware
Published: 2021-08-23
Last modified: 2026-06-17

Description

There is a denial of service vulnerability in Huawei products. A module cannot deal with specific messages due to validating inputs insufficiently. Attackers can exploit this vulnerability by sending specific messages to affected module. This can cause denial of service. Affected product versions include: S12700 V200R013C00SPC500, V200R019C00SPC500; S5700 V200R013C00SPC500, V200R019C00SPC500; S6700 V200R013C00SPC500, V200R019C00SPC500; S7700 V200R013C00SPC500, V200R019C00SPC500.

Frequently asked questions

What is CVE-2021-22357?: There is a denial of service vulnerability in Huawei products. A module cannot deal with specific messages due to validating inputs insufficiently. Attackers can exploit this vulnerability by sending specific messages to affected module. This can cause denial of service. Affected product versions include: S12700 V200R013C00SPC500, V200R019C00SPC500; S5700 V200R013C00SPC500, V200R019C00SPC500; S6700 V200R013C00SPC500, V200R019C00SPC500; S7700 V200R013C00SPC500, V200R019C00SPC500.
How severe is CVE-2021-22357?: CVE-2021-22357 has a CVSS 3.x base score of 7.5, rated high 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 high.
Is CVE-2021-22357 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-2021-22357?: CVE-2021-22357 primarily affects Huawei S12700 Firmware. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-22357?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-22357 published?: CVE-2021-22357 was published on 2021-08-23 and last updated on 2026-06-17.

References

https://www.huawei.com/en/psirt/security-advisories/huawei-sa-20210512-01-dos-en

Affected products (8)

cpe:2.3:o:huawei:s12700_firmware:v200r013c00spc500:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s12700_firmware:v200r019c00spc500:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s5700_firmware:v200r013c00spc500:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s5700_firmware:v200r019c00spc500:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s6700_firmware:v200r013c00spc500:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s6700_firmware:v200r019c00spc500:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s7700_firmware:v200r013c00spc500:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s7700_firmware:v200r019c00spc500:*:*:*:*:*:*:*

More vulnerabilities in Huawei S12700 Firmware

CVE-2016-4087 — High (CVSS 8.1): Huawei S12700 switches with software before V200R008C00SPC500 and S5700 switches with software before V200R005SPH010,…
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CVE-2016-8786 — High (CVSS 7.5): Huawei S12700 V200R005C00, V200R006C00, V200R007C00, V200R008C00, S5700 V200R006C00, V200R007C00, V200R008C00, S6700…
CVE-2017-17300 — High (CVSS 7.5): Huawei S12700 V200R008C00, V200R009C00, S5700 V200R007C00, V200R008C00, V200R009C00, S6700 V200R008C00, V200R009C00,…

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