How severe is CVE-2021-37129?

CVE-2021-37129 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-2021-37129 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-37129?

CVE-2021-37129 primarily affects Huawei Ips Module Firmware. In total, 37 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-37129?

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-2021-37129 published?

CVE-2021-37129 was published on 2021-10-27 and last updated on 2026-06-17.

CVE-2021-37129

CVE-2021-37129 is a high-severity vulnerability in Huawei Ips Module 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-787.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Huawei Ips Module Firmware
Published: 2021-10-27
Last modified: 2026-06-17

Description

There is an out of bounds write vulnerability in some Huawei products. The vulnerability is caused by a function of a module that does not properly verify input parameter. Successful exploit could cause out of bounds write leading to a denial of service condition.Affected product versions include:IPS Module V500R005C00,V500R005C20;NGFW Module V500R005C00;NIP6600 V500R005C00,V500R005C20;S12700 V200R010C00SPC600,V200R011C10SPC500,V200R011C10SPC600,V200R013C00SPC500,V200R019C00SPC200,V200R019C00SPC500,V200R019C10SPC200,V200R020C00,V200R020C10;S1700 V200R010C00SPC600,V200R011C10SPC500,V200R011C10SPC600;S2700 V200R010C00SPC600,V200R011C10SPC500,V200R011C10SPC600;S5700 V200R010C00SPC600,V200R010C00SPC700,V200R011C10SPC500,V200R011C10SPC600,V200R019C00SPC500;S6700 V200R010C00SPC600,V200R011C10SPC500,V200R011C10SPC600;S7700 V200R010C00SPC600,V200R010C00SPC700,V200R011C10SPC500,V200R011C10SPC600;S9700 V200R010C00SPC600,V200R011C10SPC500,V200R011C10SPC600;USG9500 V500R005C00,V500R005C20.

Frequently asked questions

What is CVE-2021-37129?: There is an out of bounds write vulnerability in some Huawei products. The vulnerability is caused by a function of a module that does not properly verify input parameter. Successful exploit could cause out of bounds write leading to a denial of service condition.Affected product versions include:IPS Module V500R005C00,V500R005C20;NGFW Module V500R005C00;NIP6600 V500R005C00,V500R005C20;S12700 V200R010C00SPC600,V200R011C10SPC500,V200R011C10SPC600,V200R013C00SPC500,V200R019C00SPC200,V200R019C00SPC500,V200R019C10SPC200,V200R020C00,V200R020C10;S1700 V200R010C00SPC600,V200R011C10SPC500,V200R011C10SPC600;S2700 V200R010C00SPC600,V200R011C10SPC500,V200R011C10SPC600;S5700 V200R010C00SPC600,V200R010C00SPC700,V200R011C10SPC500,V200R011C10SPC600,V200R019C00SPC500;S6700 V200R010C00SPC600,V200R011C10SPC500,V200R011C10SPC600;S7700 V200R010C00SPC600,V200R010C00SPC700,V200R011C10SPC500,V200R011C10SPC600;S9700 V200R010C00SPC600,V200R011C10SPC500,V200R011C10SPC600;USG9500 V500R005C00,V500R005C20.
How severe is CVE-2021-37129?: CVE-2021-37129 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-2021-37129 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-37129?: CVE-2021-37129 primarily affects Huawei Ips Module Firmware. In total, 37 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-37129?: 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-2021-37129 published?: CVE-2021-37129 was published on 2021-10-27 and last updated on 2026-06-17.

References

https://www.huawei.com/en/psirt/security-advisories/huawei-sa-20211020-01-outofwrite-en

Affected products (37)

cpe:2.3:o:huawei:ips_module_firmware:v500r005c00:*:*:*:*:*:*:*
cpe:2.3:o:huawei:ips_module_firmware:v500r005c20:*:*:*:*:*:*:*
cpe:2.3:o:huawei:ngfw_module_firmware:v500r005c00:*:*:*:*:*:*:*
cpe:2.3:o:huawei:nip6600_firmware:v500r005c00:*:*:*:*:*:*:*
cpe:2.3:o:huawei:nip6600_firmware:v500r005c20:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s12700_firmware:v200r010c00spc600:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s12700_firmware:v200r011c10spc500:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s12700_firmware:v200r011c10spc600:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s12700_firmware:v200r013c00spc500:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s12700_firmware:v200r019c00spc200:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s12700_firmware:v200r019c00spc500:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s12700_firmware:v200r019c10spc200:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s12700_firmware:v200r020c00:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s12700_firmware:v200r020c10:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s1700_firmware:v200r010c00spc600:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s1700_firmware:v200r011c10spc500:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s1700_firmware:v200r011c10spc600:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s2700_firmware:v200r010c00spc600:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s2700_firmware:v200r011c10spc500:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s2700_firmware:v200r011c10spc600:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s5700_firmware:v200r010c00spc600:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s5700_firmware:v200r010c00spc700:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s5700_firmware:v200r011c10spc500:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s5700_firmware:v200r011c10spc600:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s5700_firmware:v200r019c00spc500:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s6700_firmware:v200r010c00spc600:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s6700_firmware:v200r011c10spc500:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s6700_firmware:v200r011c10spc600:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s7700_firmware:v200r010c00spc600:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s7700_firmware:v200r010c00spc700:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s7700_firmware:v200r011c10spc500:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s7700_firmware:v200r011c10spc600:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s9700_firmware:v200r010c00spc600:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s9700_firmware:v200r011c10spc500:*:*:*:*:*:*:*
cpe:2.3:o:huawei:s9700_firmware:v200r011c10spc600:*:*:*:*:*:*:*
cpe:2.3:o:huawei:usg9500_firmware:v500r005c00:*:*:*:*:*:*:*
cpe:2.3:o:huawei:usg9500_firmware:v500r005c20:*:*:*:*:*:*:*

More vulnerabilities in Huawei Ips Module 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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