CVE-2020-36907Public exploitNetwork attack vector

Web-interface denial of service via CliWindow request

Published Jan 6, 2026 · Updated Jan 6, 2026

Denial of service in Extreme Networks IQ Engine (HiveOS) 11.0 and earlier allows remote attackers to interrupt the NetConfig web interface. The action.php5 endpoint dispatches an attacker-controlled _page value to CliWindow without throttling the request, leaving the Hive UI unavailable for 305 seconds. The attack requires network reachability to an enabled Hive UI, and published evidence limits the consequence to a five-minute management-interface interruption.

CVSS severity8.7
High
EPSS probability0.55%
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 Extreme Networks IQ Engine (HiveOS) 11.0 and earlier allows remote attackers to interrupt the NetConfig web interface. The action.php5 endpoint dispatches an attacker-controlled _page value to CliWindow without throttling the request, leaving the Hive UI unavailable for 305 seconds. The attack requires network reachability to an enabled Hive UI, and published evidence limits the consequence to a five-minute management-interface interruption.

The record

CVE
CVE-2020-36907
Published
Jan 6, 2026
Updated
Jan 6, 2026
Vendor
Extreme Networks
Product
IQ Engine (HiveOS)
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=<=11.x

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Extreme Networks · IQ Engine (HiveOS)version=<=11.x

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5VulnCheckCVSS: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-770Allocation of Resources Without Limits or Throttling
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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