CVE-2020-36255: An issue was discovered in IdentityModel (aka ScottBrady.IdentityModel) before 1.3.0

Q: How do I fix CVE-2020-36255?

identitymodel: upgrade to 1.3.0. Exact commands for each OS are on this page.

Q: Is CVE-2020-36255 being exploited?

CVE-2020-36255 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-36255 affect?

CVE-2020-36255 affects identitymodel. Severity is high (CVSS 7.5). 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.

Q: How urgent is CVE-2020-36255?

Priority 50/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2020-36255 is a high-severity flaw (CVSS 7.5) affecting identitymodel. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.5% (top 25%)
CISA exploited list	No
Published	2021-03-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: identitymodel project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-03-05 03:15 UTCPublished CVE record published
2026-06-17 03:15 UTCUpdated Record last modified

identitymodel project identitymodel UPGRADE

Affected: < 1.3.0

Fixed in: 1.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy identitymodel || rpm -q identitymodel || identitymodel --version

2. UPGRADE to 1.3.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade identitymodel

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade identitymodel

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-36255?

identitymodel: upgrade to 1.3.0. Exact commands for each OS are on this page.

Is CVE-2020-36255 being exploited?

CVE-2020-36255 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-36255 affect?

CVE-2020-36255 affects identitymodel. Severity is high (CVSS 7.5). 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 urgent is CVE-2020-36255?

Priority 50/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2019-1006 HIGH 7.5 DOWNGRADE DOWNGRADE An authentication bypass vulnerability exists in Windows Communication Foundation (WCF) and Windows Identity F

References

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