CVE-2021-47755

Oliver Library Server v5 - Arbitrary File Download

Oliver Library Server v5 contains a file download vulnerability that allows unauthenticated attackers to access arbitrary system files through unsanitized input in the FileServlet endpoint. Attackers can exploit the vulnerability by manipulating the 'fileName' parameter to download sensitive files from the server's filesystem.

Affected

Softlink Education · Oliver Library Server

CVSS v4.0 VULNCHECK

8.7 HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 NVD

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS

0.82% chance of exploitation in the next 30 days, 56th percentile

Published

2026-01-15

Updated

2026-04-07

Proof-of-concept exploits (1)

• https://www.exploit-db.com/exploits/50599

Security advisories

• https://www.softlinkint.com/product/oliver

References

• CVE Record
• NVD entry