CVE-2021-22356

mediumpriority · track · 24OT risk · elevatedEPSS 0.004 · 36 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.42% (36th) EPSS

CVSS 4.3 · medium

Is it mine?

26 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-28

There is a weak secure algorithm vulnerability in Huawei products. A weak secure algorithm is used in a module. Attackers can exploit this vulnerability by capturing and analyzing the messages between devices to obtain information. This can lead to information leak.Affected product versions include: IPS Module V500R005C00SPC100, V500R005C00SPC200; NGFW Module V500R005C00SPC100, V500R005C00SPC200; Secospace USG6300 V500R001C30SPC200, V500R001C30SPC600, V500R001C60SPC500, V500R005C00SPC100, V500R005C00SPC200; Secospace USG6500 V500R001C30SPC200, V500R001C30SPC600, V500R001C60SPC500, V500R005C00SPC100, V500R005C00SPC200; Secospace USG6600 V500R001C30SPC200, V500R001C30SPC600, V500R001C60SPC500, V500R005C00SPC100, V500R005C00SPC200; USG9500 V500R001C30SPC200, V500R001C30SPC600, V500R001C60SPC500, V500R005C00SPC100, V500R005C00SPC200.

cvss

Technical severity, 0–10. One row per scoring source.

5.9

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.04.3mediumAV:N/AC:M/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v3.15.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 2.2 · impact 3.6

v3.15.4mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-327USprimary

affected products (26)

Products and version ranges known to be affected.

n/a IPS Module;NGFW Module;Secospace USG6300;Secospace USG6500;Secospace USG6600;USG9500≤ V500R005C00SPC100,V500R005C00SPC200enisa_euvdEU
n/a IPS Module;NGFW Module;Secospace USG6300;Secospace USG6500;Secospace USG6600;USG9500≤ V500R001C30SPC200,V500R001C30SPC600,V500R001C60SPC500,V500R005C00SPC100,V500R005C00SPC200enisa_euvdEU
huawei ips module firmware= v500r005c00spc100nvdUScpe:2.3:o:huawei:ips_module_firmware:*:*:*:*:*:*:*:*
huawei ips module firmware= v500r005c00spc200nvdUScpe:2.3:o:huawei:ips_module_firmware:*:*:*:*:*:*:*:*
huawei ngfw module firmware= v500r005c00spc100nvdUScpe:2.3:o:huawei:ngfw_module_firmware:*:*:*:*:*:*:*:*
huawei ngfw module firmware= v500r005c00spc200nvdUScpe:2.3:o:huawei:ngfw_module_firmware:*:*:*:*:*:*:*:*
huawei secospace usg6300 firmware= v500r001c30spc200nvdUScpe:2.3:o:huawei:secospace_usg6300_firmware:*:*:*:*:*:*:*:*
huawei secospace usg6300 firmware= v500r001c30spc600nvdUScpe:2.3:o:huawei:secospace_usg6300_firmware:*:*:*:*:*:*:*:*
huawei secospace usg6300 firmware= v500r001c60spc500nvdUScpe:2.3:o:huawei:secospace_usg6300_firmware:*:*:*:*:*:*:*:*
huawei secospace usg6300 firmware= v500r005c00spc100nvdUScpe:2.3:o:huawei:secospace_usg6300_firmware:*:*:*:*:*:*:*:*
huawei secospace usg6300 firmware= v500r005c00spc200nvdUScpe:2.3:o:huawei:secospace_usg6300_firmware:*:*:*:*:*:*:*:*
huawei secospace usg6500 firmware= v500r001c30spc200nvdUScpe:2.3:o:huawei:secospace_usg6500_firmware:*:*:*:*:*:*:*:*
huawei secospace usg6500 firmware= v500r001c30spc600nvdUScpe:2.3:o:huawei:secospace_usg6500_firmware:*:*:*:*:*:*:*:*
huawei secospace usg6500 firmware= v500r001c60spc500nvdUScpe:2.3:o:huawei:secospace_usg6500_firmware:*:*:*:*:*:*:*:*
huawei secospace usg6500 firmware= v500r005c00spc100nvdUScpe:2.3:o:huawei:secospace_usg6500_firmware:*:*:*:*:*:*:*:*
huawei secospace usg6500 firmware= v500r005c00spc200nvdUScpe:2.3:o:huawei:secospace_usg6500_firmware:*:*:*:*:*:*:*:*
huawei secospace usg6600 firmware= v500r001c30spc200nvdUScpe:2.3:o:huawei:secospace_usg6600_firmware:*:*:*:*:*:*:*:*
huawei secospace usg6600 firmware= v500r001c30spc600nvdUScpe:2.3:o:huawei:secospace_usg6600_firmware:*:*:*:*:*:*:*:*
huawei secospace usg6600 firmware= v500r001c60spc500nvdUScpe:2.3:o:huawei:secospace_usg6600_firmware:*:*:*:*:*:*:*:*
huawei secospace usg6600 firmware= v500r005c00spc100nvdUScpe:2.3:o:huawei:secospace_usg6600_firmware:*:*:*:*:*:*:*:*

showing 20 of 26

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2021-11-23modified 2026-06-17

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+915 more

references (5)

External citations — patches, advisories, analysis.

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