CVE-2021-47755

HIGH 7.5

Oliver Library Server v5 - Arbitrary File Download

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-22
Vendor	softlink education
Product	oliver library server
Published	Jan 15, 2026
Last Updated	Apr 7, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

Softlink Education / Oliver Library Server

< 8.00.008.053

References

NVD ↗ CVE.org ↗ EPSS Data ↗

exploit-db.com: https://www.exploit-db.com/exploits/50599 softlinkint.com: https://www.softlinkint.com/product/oliver/

Credits

Mandeep Singh, Ishaan Vij, Luke Blues, CTRL Group