CVE-2021-38085
CVE-2021-38085 is a high-severity vulnerability in Canon Pixma Tr150 Firmware with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-732.
Key facts
- Severity: High (CVSS 3.x base score 7.8)
- CVSS v2: 7.2
- EPSS exploit prediction: 1% (59th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-732
- Affected product: Canon Pixma Tr150 Firmware
- Published:
- Last modified:
Description
The Canon TR150 print driver through 3.71.2.10 is vulnerable to a privilege escalation issue. During the add printer process, a local attacker can overwrite CNMurGE.dll and, if timed properly, the overwritten DLL will be loaded into a SYSTEM process resulting in escalation of privileges. This occurs because the driver drops a world-writable DLL into a CanonBJ %PROGRAMDATA% location that gets loaded by printisolationhost (a system process).
Frequently asked questions
- What is CVE-2021-38085?
- The Canon TR150 print driver through 3.71.2.10 is vulnerable to a privilege escalation issue. During the add printer process, a local attacker can overwrite CNMurGE.dll and, if timed properly, the overwritten DLL will be loaded into a SYSTEM process resulting in escalation of privileges. This occurs because the driver drops a world-writable DLL into a CanonBJ %PROGRAMDATA% location that gets loaded by printisolationhost (a system process).
- How severe is CVE-2021-38085?
- CVE-2021-38085 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2021-38085 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-38085?
- CVE-2021-38085 affects Canon Pixma Tr150 Firmware. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-38085?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2021-38085 published?
- CVE-2021-38085 was published on 2021-08-11 and last updated on 2026-06-17.
References
- http://packetstormsecurity.com/files/163795/Canon-TR150-Driver-3.71.2.10-Privilege-Escalation.html
- https://defcon.org/html/defcon-29/dc-29-speakers.html#baines
- https://raw.githubusercontent.com/jacob-baines/vuln_disclosure/main/vuln_2021_03.txt
- https://www.youtube.com/watch?v=vdesswZYz-8
Affected products (1)
- cpe:2.3:o:canon:pixma_tr150_firmware:*:*:*:*:*:*:*:*
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