CVE-2020-8503

Name: CVE-2020-8503
Creator: NVD / NIST
Published: 2020-01-31T20:15:11.243+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.73%

Last modified Jun 17, 2026

CVE-2020-8503 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Biscom Secure File Transfer (SFT) 5.0.1050 through 5.1.1067 and 6.0.1000 through 6.0.1003 allows Insecure Direct Object Reference (IDOR) by an authenticated sender because of an error in a file-upload feature. This is fixed in 5.1.1068 and 6.0.1004.. EPSS estimates a 0.73% chance of exploitation in the next 30 days.

Description

Biscom Secure File Transfer (SFT) 5.0.1050 through 5.1.1067 and 6.0.1000 through 6.0.1003 allows Insecure Direct Object Reference (IDOR) by an authenticated sender because of an error in a file-upload feature. This is fixed in 5.1.1068 and 6.0.1004.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.73%

49.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-639

Affected Software

Vendor	Product	Versions
Biscom	Secure File Transfer	>= 5.0.1050, <= 5.1.1067
Biscom	Secure File Transfer	>= 6.0.1000, <= 6.0.1003

References

https://cve.biscom.com/bis-sft-cv-0008Vendor Advisory
https://cve.biscom.com/bis-sft-cv-0008Vendor Advisory

Timeline

Published: Jan 31, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-8503?

How severe is CVE-2020-8503?

CVE-2020-8503 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.73% probability of exploitation in the next 30 days.

How do I fix CVE-2020-8503?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-8503?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST