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Vulnerabilities

Vulnerability · CVE-2021-47755

Oliver Library Server v5 contains a file download vulnerability that allows unauthenticated attackers to access arbitrary system files through unsanitized input in the FileServlet

Published Jan 15, 2026 · catalog updated Apr 7, 2026 · Softlink Education Oliver Library Server

Last checked Oct 30, 2026. A connected source was read within the last 7 days.

Check this week

CVE-2021-47755 is not in CISA KEV. FIRST estimates a 82.00% chance of exploitation in the next 30 days. Check whether you run Softlink Education Oliver Library Server.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
82.00%
Remediation
Version ranges on file
Affected products
vendor Softlink Education Oliver Library Server < 8.00.008.053

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Softlink Education Oliver Library Server < 8.00.008.053< 8.00.008.053

How to fix CVE-2021-47755

  • Upgrade

    CVE-2021-47755 lists a fix boundary at 8.00.008.053. Compare the installed build with that boundary before you change production.

  • Version check

    Affected < 8.00.008.053

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2021-47755 is not in CISA KEV. FIRST estimates a 82.00% chance of exploitation in the next 30 days. Check whether you run Softlink Education Oliver Library Server.

Which versions are affected?

Compare what you have installed with Softlink Education Oliver Library Server < 8.00.008.053 < 8.00.008.053. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 82.00%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 15, 2026 · EUVD

    Detected

    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.

  2. Apr 7, 2026 · EUVD

    Updated

    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.

Sources

  • EUVDVulnerability recordEUVD-2026-2777

    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 downlo

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Apr 7, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • EUVDOct 30, 2026