Arbitrary file upload in Visualware Myconnection Server
CVE-2021-27198
An issue was discovered in Visualware MyConnection Server before v11.1a. Unauthenticated Remote Code Execution can occur via Arbitrary File Upload in the web service when using a myspeed/sf?filename= URI. This application is written in Java and is thus cross-platform. The Windows installation runs as SYSTEM, which means that exploitation gives one Administrator privileges on the target system.
Vulnerability class: Unrestricted File Upload
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.136 (96.4th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 96.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.136 · newest: 0.136 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- myconnectionserver.visualware.com/download.html (Product, Vendor Advisory)
- myconnectionserver.visualware.com/support/newrelease.html (Release Notes, Vendor Advisory)
- seclists.org/fulldisclosure/2021/Feb/81 (mailing-list, Mailing List, Third Party Advisory)
- packetstormsecurity.com/files/161571/VisualWare-MyConnection-Server-11.x-Remote… (VDB Entry, Third Party Advisory)
- www.securifera.com/advisories/cve-2021-27198/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-27198?
- CVE-2021-27198 is a critical-severity vulnerability in Visualware Myconnection Server, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2021-02-26.
- How severe is CVE-2021-27198?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-27198 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.