CVE-2021-45027

HIGHNVD 7.57.5—Elevated

7.5

An arbitrary file download vulnerability in Oliver v5 Library Server Versions < 5.00.008.053 via the FileServlet function allows for arbitrary file download by an attacker using unsanitized user supplied input.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 95.2%
KEV: Not listed

Published

September 1, 2022

Last Modified

November 21, 2024

References (4)

cve@mitrehttps://www.exploit-db.com/exploits/50599
cve@mitrehttps://www.softlinkint.com/product/oliver/
af854a3a-2127-422b-91ae-364da2661108https://www.exploit-db.com/exploits/50599
af854a3a-2127-422b-91ae-364da2661108https://www.softlinkint.com/product/oliver/

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-494Download of Code Without Integrity Check

Data Freshness Timeline

(refreshed 11× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-25 16:09 UTCEG score recompute
2026-05-25 16:09 UTCGHSA enrichment

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Nucleihttp/cves/2021/CVE-2021-45027.yaml
First seen Jan 1, 2021
Oliver 5 Library Server <8.00.008.053 - Local File Inclusion
Open source ↗

Frequently asked(5)

What is CVE-2021-45027?

CVE-2021-45027 is a high vulnerability published on September 1, 2022. An arbitrary file download vulnerability in Oliver v5 Library Server Versions < 5.00.008.053 via the FileServlet function allows for arbitrary file download by an attacker using unsanitized user supplied input.

When was CVE-2021-45027 disclosed?

CVE-2021-45027 was first published in the National Vulnerability Database on September 1, 2022, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-45027 actively exploited?

CVE-2021-45027 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 95.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-45027?

CVE-2021-45027 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2021-45027?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-45027, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-45027

Explore →

Is Your Infrastructure Affected by CVE-2021-45027?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs