CVE-2021-22393

Service interruption via specific-message flood

Published Apr 28, 2021 · Updated Aug 3, 2024

Denial of service in affected Huawei CloudEngine 5800, 6800, 7800, and 12800 switches allows remote attackers to interrupt service. An affected module cannot correctly process a large volume of specific messages because of an undisclosed design weakness, disrupting its normal functionality. An unauthenticated attacker with adjacent-network access must deliver the message flood; Huawei has not identified the module or characterized the interruption as a hang, crash, or restart.

CVSS severity4.3
Medium
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in affected Huawei CloudEngine 5800, 6800, 7800, and 12800 switches allows remote attackers to interrupt service. An affected module cannot correctly process a large volume of specific messages because of an undisclosed design weakness, disrupting its normal functionality. An unauthenticated attacker with adjacent-network access must deliver the message flood; Huawei has not identified the module or characterized the interruption as a hang, crash, or restart.

The record

CVE
CVE-2021-22393
Published
Apr 28, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1498.001
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 28, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.0HuaweiCVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:F/RL:O/RC:C
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.3HuaweiCVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1498.001Direct Network Flood

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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