CVE-2021-22356

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.

Published: 2021-11-23 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-22356 is rated Low Risk (30.1/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.07%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-22356

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-03-17 0.15% 0.07% -0.08%
2 2023-06-16 0.14% 0.15% +0.01%
3 2023-03-07 — 0.14% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-22356

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.9 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.2 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2021-22356

Affected software / configurations for CVE-2021-22356

Vendor Product Version Raw CPE
huawei ips_module_firmware v500r005c00spc100 cpe:2.3:o:huawei:ips_module_firmware:v500r005c00spc100:*:*:*:*:*:*:*
huawei ips_module_firmware v500r005c00spc200 cpe:2.3:o:huawei:ips_module_firmware:v500r005c00spc200:*:*:*:*:*:*:*
huawei ngfw_module_firmware v500r005c00spc100 cpe:2.3:o:huawei:ngfw_module_firmware:v500r005c00spc100:*:*:*:*:*:*:*
huawei ngfw_module_firmware v500r005c00spc200 cpe:2.3:o:huawei:ngfw_module_firmware:v500r005c00spc200:*:*:*:*:*:*:*
huawei secospace_usg6300_firmware v500r001c30spc200 cpe:2.3:o:huawei:secospace_usg6300_firmware:v500r001c30spc200:*:*:*:*:*:*:*
huawei secospace_usg6300_firmware v500r001c30spc600 cpe:2.3:o:huawei:secospace_usg6300_firmware:v500r001c30spc600:*:*:*:*:*:*:*
huawei secospace_usg6300_firmware v500r001c60spc500 cpe:2.3:o:huawei:secospace_usg6300_firmware:v500r001c60spc500:*:*:*:*:*:*:*
huawei secospace_usg6300_firmware v500r005c00spc100 cpe:2.3:o:huawei:secospace_usg6300_firmware:v500r005c00spc100:*:*:*:*:*:*:*
huawei secospace_usg6300_firmware v500r005c00spc200 cpe:2.3:o:huawei:secospace_usg6300_firmware:v500r005c00spc200:*:*:*:*:*:*:*
huawei secospace_usg6500_firmware v500r001c30spc200 cpe:2.3:o:huawei:secospace_usg6500_firmware:v500r001c30spc200:*:*:*:*:*:*:*
huawei secospace_usg6500_firmware v500r001c30spc600 cpe:2.3:o:huawei:secospace_usg6500_firmware:v500r001c30spc600:*:*:*:*:*:*:*
huawei secospace_usg6500_firmware v500r001c60spc500 cpe:2.3:o:huawei:secospace_usg6500_firmware:v500r001c60spc500:*:*:*:*:*:*:*
huawei secospace_usg6500_firmware v500r005c00spc100 cpe:2.3:o:huawei:secospace_usg6500_firmware:v500r005c00spc100:*:*:*:*:*:*:*
huawei secospace_usg6500_firmware v500r005c00spc200 cpe:2.3:o:huawei:secospace_usg6500_firmware:v500r005c00spc200:*:*:*:*:*:*:*
huawei secospace_usg6600_firmware v500r001c30spc200 cpe:2.3:o:huawei:secospace_usg6600_firmware:v500r001c30spc200:*:*:*:*:*:*:*
huawei secospace_usg6600_firmware v500r001c30spc600 cpe:2.3:o:huawei:secospace_usg6600_firmware:v500r001c30spc600:*:*:*:*:*:*:*
huawei secospace_usg6600_firmware v500r001c60spc500 cpe:2.3:o:huawei:secospace_usg6600_firmware:v500r001c60spc500:*:*:*:*:*:*:*
huawei secospace_usg6600_firmware v500r005c00spc100 cpe:2.3:o:huawei:secospace_usg6600_firmware:v500r005c00spc100:*:*:*:*:*:*:*
huawei secospace_usg6600_firmware v500r005c00spc200 cpe:2.3:o:huawei:secospace_usg6600_firmware:v500r005c00spc200:*:*:*:*:*:*:*
huawei usg9500_firmware v500r001c30spc200 cpe:2.3:o:huawei:usg9500_firmware:v500r001c30spc200:*:*:*:*:*:*:*
huawei usg9500_firmware v500r001c30spc600 cpe:2.3:o:huawei:usg9500_firmware:v500r001c30spc600:*:*:*:*:*:*:*
huawei usg9500_firmware v500r001c60spc500 cpe:2.3:o:huawei:usg9500_firmware:v500r001c60spc500:*:*:*:*:*:*:*
huawei usg9500_firmware v500r005c00spc100 cpe:2.3:o:huawei:usg9500_firmware:v500r005c00spc100:*:*:*:*:*:*:*
huawei usg9500_firmware v500r005c00spc200 cpe:2.3:o:huawei:usg9500_firmware:v500r005c00spc200:*:*:*:*:*:*:*

References for CVE-2021-22356

cvelogic Threat Intelligence