CVE-2020-10517

Name: CVE-2020-10517
Creator: NVD / NIST
Published: 2020-08-27T22:15:09.77+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 1.05%

Last modified Jun 17, 2026

CVE-2020-10517 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. An improper access control vulnerability was identified in GitHub Enterprise Server that allowed authenticated users of the instance to determine the names of unauthorized private repositories given their numerical IDs. This vulnerability did not allow unauthorized access to any repository content besides the name. EPSS estimates a 1.05% chance of exploitation in the next 30 days.

Description

An improper access control vulnerability was identified in GitHub Enterprise Server that allowed authenticated users of the instance to determine the names of unauthorized private repositories given their numerical IDs. This vulnerability did not allow unauthorized access to any repository content besides the name. This vulnerability affected all versions of GitHub Enterprise Server prior to 2.22 and was fixed in versions 2.21.6, 2.20.15, and 2.19.21. This vulnerability was reported via the GitHub Bug Bounty program.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

1.05%

59.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-285

Affected Software

Vendor	Product	Versions
Github	Github	< 2.19.21
Github	Github	>= 2.20.0, < 2.20.15
Github	Github	>= 2.21.0, < 2.21.6

References

https://enterprise.github.com/releases/2.19.21/notesRelease Notes, Vendor Advisory
https://enterprise.github.com/releases/2.20.15/notesRelease Notes, Vendor Advisory
https://enterprise.github.com/releases/2.21.6/notesRelease Notes, Vendor Advisory
https://enterprise.github.com/releases/2.19.21/notesRelease Notes, Vendor Advisory
https://enterprise.github.com/releases/2.20.15/notesRelease Notes, Vendor Advisory
https://enterprise.github.com/releases/2.21.6/notesRelease Notes, Vendor Advisory

Timeline

Published: Aug 27, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-10517?

How severe is CVE-2020-10517?

CVE-2020-10517 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 1.05% probability of exploitation in the next 30 days.

How do I fix CVE-2020-10517?

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-2020-10517?

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

Scan your code now

Source: NVD / NIST