CVE-2020-5550Network attack vector

Registered-user impersonation via session fixation

Published Apr 8, 2020 · Updated Aug 4, 2024

Session fixation in Plat'Home EasyBlocks IPv6 2.0.1 and earlier allows remote attackers to impersonate registered users in the management console. Plat'Home has not published the affected request handler or how an attacker-supplied session identifier becomes bound to a victim's authenticated management session. Exploitation requires user interaction with attacker-controlled content, after which the attacker can access the management console and disclose or alter managed information.

CVSS severity4.2
Medium
EPSS probability1.91%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Session fixation in Plat'Home EasyBlocks IPv6 2.0.1 and earlier allows remote attackers to impersonate registered users in the management console. Plat'Home has not published the affected request handler or how an attacker-supplied session identifier becomes bound to a victim's authenticated management session. Exploitation requires user interaction with attacker-controlled content, after which the attacker can access the management console and disclose or alter managed information.

The record

CVE
CVE-2020-5550
Published
Apr 8, 2020
Updated
Aug 4, 2024
Vendor
Plat'Home Co., Ltd.
Product
EasyBlocks IPv6
Classifications
CWE-384, T1550.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 8, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=Ver. 2.0.1 and earlier, and Enterprise Ver. 2.0.1 and earlier

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Plat'Home Co., Ltd. · EasyBlocks IPv6version=Ver. 2.0.1 and earlier, and Enterprise Ver. 2.0.1 and earlier

Published CVSS scores

4.2JPCERT/CC and IPACVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
4.0JPCERT/CC and IPAAV:N/AC:H/Au:N/C:P/I:P/A:N

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-384Session Fixation
T1550.004Web Session Cookie

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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