CVE-2023-27520Network attack vector

Unauthenticated configuration changes via forged browser requests

Published Apr 11, 2023 · Updated Feb 10, 2025

Cross-site request forgery in Seiko Epson Web Config allows remote attackers to change device settings through a logged-in user's browser. Web Config accepts state-changing requests under an existing authenticated browser session without verifying that the user intended them. Exploitation requires a logged-in user to view a malicious page; the demonstrated consequence is unintended device-configuration changes.

CVSS severity6.5
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in Seiko Epson Web Config allows remote attackers to change device settings through a logged-in user's browser. Web Config accepts state-changing requests under an existing authenticated browser session without verifying that the user intended them. Exploitation requires a logged-in user to view a malicious page; the demonstrated consequence is unintended device-configuration changes.

The record

CVE
CVE-2023-27520
Published
Apr 11, 2023
Updated
Feb 10, 2025
Vendor
Seiko Epson Corporation
Product
Web Config
Classifications
CWE-352
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 11, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 10, 2025Record 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=unspecified

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Seiko Epson Corporation · Web Configversion=unspecified

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
2.6JPCERT/CC and IPAAV:N/AC:H/Au:N/C:N/I:P/A:N
4.3JPCERT/CC and IPACVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)

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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