CVE-2022-28940Public exploitNetwork attack vector

Unauthenticated router crash via oversized ajaxmsg

Published May 4, 2022 · Updated Aug 3, 2024

Missing authorization in H3C Magic R100 V100R005 and earlier allows remote attackers to crash the router via a crafted HTTP request. The /AJAX/ajaxget endpoint processes an extremely long ajaxmsg value without authentication or an effective length restriction, causing the web service or device to stop responding. No credentials or user interaction are required; the observed outcome ranges from a web-service restart to a router hang that interrupts connectivity.

CVSS severity7.5
High
EPSS probability1.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in H3C Magic R100 V100R005 and earlier allows remote attackers to crash the router via a crafted HTTP request. The /AJAX/ajaxget endpoint processes an extremely long ajaxmsg value without authentication or an effective length restriction, causing the web service or device to stop responding. No credentials or user interaction are required; the observed outcome ranges from a web-service restart to a router hang that interrupts connectivity.

The record

CVE
CVE-2022-28940
Published
May 4, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-862, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 4, 2022CVE 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.1NVDAV:N/AC:M/Au:N/C:N/I:N/A:C
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
T1499.004Application or System Exploitation

Public exploit references

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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