CVE-2023-0853

Remote code execution via mDNS stack overflow

Published May 11, 2023 · Updated Feb 10, 2025

Stack buffer overflow in Canon printer firmware 11.04 and earlier allows remote attackers to execute code through crafted mDNS packets. The mDNS packet handler fails to validate attacker-controlled data length before copying it into a fixed-length stack buffer during NSEC registration. No authentication or user interaction is required; access to the target's network segment enables code execution as the service account or makes the printer unresponsive.

CVSS severity9.8
Critical
EPSS probability1.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in Canon printer firmware 11.04 and earlier allows remote attackers to execute code through crafted mDNS packets. The mDNS packet handler fails to validate attacker-controlled data length before copying it into a fixed-length stack buffer during NSEC registration. No authentication or user interaction is required; access to the target's network segment enables code execution as the service account or makes the printer unresponsive.

The record

CVE
CVE-2023-0853
Published
May 11, 2023
Updated
Feb 10, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121, T1190
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8Canon Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.

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No observations available

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

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1190Exploit Public-Facing Application

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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