CVE-2020-36255

Name: CVE-2020-36255
Creator: NVD / NIST
Published: 2021-03-05T03:15:12.51+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.53%

Last modified Jun 17, 2026

CVE-2020-36255 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. An issue was discovered in IdentityModel (aka ScottBrady.IdentityModel) before 1.3.0. The Branca implementation allows an attacker to modify and forge authentication tokens.. EPSS estimates a 1.53% chance of exploitation in the next 30 days.

Description

An issue was discovered in IdentityModel (aka ScottBrady.IdentityModel) before 1.3.0. The Branca implementation allows an attacker to modify and forge authentication tokens.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.53%

71.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Identitymodel Project	Identitymodel	< 1.3.0

References

https://github.com/scottbrady91/IdentityModel/compare/1.2.0...1.3.0Patch, Release Notes, Third Party Advisory
https://github.com/scottbrady91/IdentityModel/issues/3Broken Link, Issue Tracking, Third Party Advisory
https://github.com/scottbrady91/IdentityModel/issues/4Broken Link, Issue Tracking, Third Party Advisory
https://github.com/scottbrady91/IdentityModel/compare/1.2.0...1.3.0Patch, Release Notes, Third Party Advisory
https://github.com/scottbrady91/IdentityModel/issues/3Broken Link, Issue Tracking, Third Party Advisory
https://github.com/scottbrady91/IdentityModel/issues/4Broken Link, Issue Tracking, Third Party Advisory

Timeline

Published: Mar 5, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-36255?

An issue was discovered in IdentityModel (aka ScottBrady.IdentityModel) before 1.3.0. The Branca implementation allows an attacker to modify and forge authentication tokens.

How severe is CVE-2020-36255?

CVE-2020-36255 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.53% probability of exploitation in the next 30 days.

How do I fix CVE-2020-36255?

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-2020-36255?

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

Scan your code now

Source: NVD / NIST