CVE-2021-27582: org/mitre/oauth2/web/OAuthConfirmationController.java in the OpenID Connect server implementation for MITREid

Q: How do I fix CVE-2021-27582?

connect: upgrade to newer than 1.3.3. Exact commands for each OS are on this page.

Q: Is CVE-2021-27582 being exploited?

CVE-2021-27582 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-2021-27582 affect?

CVE-2021-27582 affects connect. Severity is critical (CVSS 9.1). org/mitre/oauth2/web/OAuthConfirmationController.java in the OpenID Connect server implementation for MITREid Connect through 1.3.3 contains a Mass Assignment (aka Autobinding) vulnerability. This arises due to unsafe usage of the @ModelAtt

Q: How urgent is CVE-2021-27582?

Priority 63/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.1REMOTEUPGRADE

CVE-2021-27582 is a critical-severity flaw (CVSS 9.1) affecting connect. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

org/mitre/oauth2/web/OAuthConfirmationController.java in the OpenID Connect server implementation for MITREid Connect through 1.3.3 contains a Mass Assignment (aka Autobinding) vulnerability. This arises due to unsafe usage of the @ModelAttribute annotation during the OAuth authorization flow, in which HTTP request parameters affect an authorizationRequest.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.2% (top 17%)
CISA exploited list	No
Weakness	CWE-1321
Published	2021-02-23
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mitreid

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

Am I affected?

Timeline

2021-02-23 18:15 UTCPublished CVE record published
2026-06-17 03:45 UTCUpdated Record last modified

mitreid connect UPGRADE

Affected: <= 1.3.3

Fixed in: newer than 1.3.3

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.3.3 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade connect

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-2021-27582?

connect: upgrade to newer than 1.3.3. Exact commands for each OS are on this page.

Is CVE-2021-27582 being exploited?

CVE-2021-27582 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-2021-27582 affect?

CVE-2021-27582 affects connect. Severity is critical (CVSS 9.1). org/mitre/oauth2/web/OAuthConfirmationController.java in the OpenID Connect server implementation for MITREid Connect through 1.3.3 contains a Mass Assignment (aka Autobinding) vulnerability. This arises due to unsafe usage of the @ModelAtt

How urgent is CVE-2021-27582?

Priority 63/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Java vulnerabilities

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References

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