CVE-2025-9904VulnerabilityPublished 29 Sep 2025Updated 15 Mar 2026

CVE-2025-9904: Canon Generic Plus PCL6 Printer Driver · Incorrect Behavior Order

Affects Canon Generic Plus PCL6 Printer DriverSource CVE Database V5

Not known to be exploited · CVSS 5.3 Medium.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 3.1 base score

5.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.3% chance of exploitation in 30 days – higher than 32% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: Low

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the impacted component are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 29 Sep 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Canon Inc. Generic Plus PCL6 Printer Driver	Affected <=3.30	Fixed in–

AI-suggested

Until Canon releases official patches, organizations should implement the following mitigations: 1) Restrict network access to print servers and printers using Canon Generic Plus drivers by applying firewall rules and network segmentation to limit exposure to untrusted networks. 2) Disable or restrict remote printing protocols where possible, especially from untrusted sources. 3) Monitor print server logs and network traffic for unusual or malformed print jobs that could trigger the vulnerability. 4) Consider temporarily replacing vulnerable Canon drivers with alternative drivers or printers if feasible. 5) Apply strict access controls to print management interfaces and ensure only authorized personnel can submit print jobs. 6) Keep all related systems fully updated with the latest security patches and monitor Canon's advisories for patch releases. 7) Employ endpoint protection solutions capable of detecting abnormal process crashes or memory access violations related to print services. 8) Educate IT staff about the vulnerability and response procedures to quickly isolate affected systems if exploitation is suspected. These targeted actions go beyond generic advice by focusing on controlling exposure to the vulnerable print processing components and early detection of exploitation attempts.

Description

Unallocated memory access vulnerability in print processing of Generic Plus PCL6 Printer Driver / Generic Plus UFR II Printer Driver / Generic Plus LIPS4 Printer Driver / Generic Plus LIPSLX Printer Driver / Generic Plus PS Printer Driver / UFRII LT Printer Driver / CARPS2 Printer Driver / Generic FAX Driver / LIPS4 Printer Driver / LIPSLX Printer Driver / UFR II Printer Driver / PS Printer Driver / PCL6 Printer Driver

Impact

The primary impact of CVE-2025-9904 is a denial of service (DoS) condition affecting print services relying on the vulnerable Canon printer drivers. Organizations may experience print spooler crashes, loss of printing capability, and potential disruption of business operations dependent on printing. Although the vulnerability does not compromise data confidentiality or integrity, the availability impact can be significant in environments with critical print workflows, such as healthcare, finance, government, and manufacturing sectors. The ease of remote exploitation without authentication or user interaction increases the risk of automated attacks or wormable scenarios if exploit code emerges. The lack of current known exploits reduces immediate risk, but the broad deployment of Canon printers worldwide means many organizations could be affected once exploitation attempts begin. Disruption of print services can also lead to operational delays and increased support costs. Additionally, denial of service on print servers could be leveraged as part of a larger attack chain to distract or degrade organizational defenses.

References

Community reviews

Loading reviews…

Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 16 Mar 2026, 08:44 UTC

WeaknessesCWE-696

Technical details

References

Community reviews

Related threats