CVE-2021-22360Network attack vector

Service interruption via improper resource management

Published May 27, 2021 · Updated Aug 3, 2024

Resource-management error in affected Huawei USG9500 firmware allows remote authenticated users to interrupt service through network operations. Huawei identifies improper resource management in an unspecified function but has not disclosed the function, resource, or triggering operations. Exploitation requires high-privilege authentication and access to the device's network, and the documented consequence is availability loss only.

CVSS severity4.9
Medium
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource-management error in affected Huawei USG9500 firmware allows remote authenticated users to interrupt service through network operations. Huawei identifies improper resource management in an unspecified function but has not disclosed the function, resource, or triggering operations. Exploitation requires high-privilege authentication and access to the device's network, and the documented consequence is availability loss only.

The record

CVE
CVE-2021-22360
Published
May 27, 2021
Updated
Aug 3, 2024
Vendor
Huawei Technologies Co., Ltd.
Product
USG9500
Classifications
CWE-770, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=V500R001C60SPC500,V500R005C00SPC100,V500R005C00SPC200

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Huawei Technologies Co., Ltd. · USG9500version=V500R001C60SPC500,V500R005C00SPC100,V500R005C00SPC200

Published CVSS scores

4.9NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
4.0NIST NVDAV:N/AC:L/Au:S/C:N/I:N/A:P

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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499Endpoint Denial of Service

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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