Arbitrary file upload in Sfcyazilim Sonlogger
CVE-2021-27964
SonLogger before 6.4.1 is affected by Unauthenticated Arbitrary File Upload. An attacker can send a POST request to /Config/SaveUploadedHotspotLogoFile without any authentication or session header. There is no check for the file extension or content of the uploaded file.
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: 0.475 (98.8th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 99th percentile — 98.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.475 · newest: 0.475 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/erberkan/SonLogger-vulns (Exploit, Third Party Advisory)
- www.sonlogger.com/releasenotes (Release Notes, Vendor Advisory)
- packetstormsecurity.com/files/161793/SonLogger-4.2.3.3-Shell-Upload.html (Exploit, VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-27964?
- CVE-2021-27964 is a critical-severity vulnerability in Sfcyazilim Sonlogger, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2021-03-05.
- How severe is CVE-2021-27964?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-27964 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.