Vulnerability in Seiko Epson Printer Control Language Lacking Authentication and Encryption
CVE-2026-23767

9.8CRITICAL

Key Information:

Vendor

Seiko Epson Corporation

Status
Esc/pos
Vendor
CVE Published:
5 March 2026

What is CVE-2026-23767?

Seiko Epson's ESC/POS printer control language presents significant security concerns due to inadequate mechanisms for user authentication and command authorization. The absence of controls to restrict network communication sources or destinations further exacerbates these vulnerabilities. Furthermore, commands are transmitted without the necessary encryption and integrity protection, leaving devices susceptible to potential exploitation by malicious actors. It is essential for users utilizing ESC/POS to implement additional security measures to mitigate these risks.

Affected Version(s)

ESC/POS All products implementing ESC/POS

References

https://www.epson.jp/support/misc_t/260305_oshirase.htm
https://download4.epson.biz/sec_pubs/bs/pdf/IP_Filtering_...
https://jvn.jp/en/ta/JVNTA97995322/

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.