How severe is CVE-2021-4294?

CVE-2021-4294 has a CVSS score of 5.9/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2021-4294?

CVE-2021-4294 affects the following packages: github.com/openshift/osin (Go). Ecosystems affected: Go.

How do I fix CVE-2021-4294?

Update github.com/openshift/osin to 1.0.2-0.20210113124101-8612686d6dda or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-4294 is resolved across your whole dependency graph.

How do I detect CVE-2021-4294 in my Go dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/openshift/osin, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2021-4294 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2021-4294 actively exploited in the wild?

No public exploit code has been indexed for CVE-2021-4294 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2021-4294?

CVE-2021-4294 has an EPSS (Exploit Prediction Scoring System) score of 0.7%, placing it in the 54th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2021-4294?

CVE-2021-4294 is classified as CWE-208 (CWE-208), CWE-203 (CWE-203). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2021-4294 published, and has it been updated?

CVE-2021-4294 was published on December 28, 2022 and was last updated on October 20, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐹

🐹 Go

Not in CISA KEV

MEDIUM severity

CVE-2021-4294 — osin

MEDIUMFix: openshift/osin@8612686

CVE-2021-4294 is a medium-severity (CVSS 5.9) CWE-208 vulnerability in github.com/openshift/osin. A fix is available for github.com/openshift/osin — see the affected versions and patch details below.

OpenShift OSIN vulnerable to Observable Timing Discrepancy

Also known asGHSA-m7qp-cj9p-gj85GO-2022-1201

Published

Dec 28, 2022

Updated

Oct 20, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

0.7%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs54th percentile — riskier than 54% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

🐹github.com/openshift/osin

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

A vulnerability was found in OpenShift OSIN. It has been classified as problematic. This affects the function ClientSecretMatches/CheckClientSecret. The manipulation of the argument secret leads to observable timing discrepancy. The name of the patch is 8612686d6dda34ae9ef6b5a974e4b7accb4fea29. It is recommended to apply a patch to fix this issue. The associated identifier of this vulnerability is VDB-216987.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`github.com/openshift/osin`	all versions	1.0.2-0.20210113124101-8612686d6dda`go get github.com/openshift/osin@v1.0.2-0.20210113124101-8612686d6dda`

Affected Products

2 products · 3 configurations

Application

openshift container platformredhat

1 version

4.0

Application

openshift osinredhat

2 versions

1.0.01.0.1

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/openshift/osin, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/openshift/osin to 1.0.2-0.20210113124101-8612686d6dda or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-4294 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate

Product	Fixed in	Advisory
Red Hat OpenShift Container Platform 4.12	`openshift4/ose-oauth-server-rhel8:v4.12.0-202405091536.p0.g0c434f4.assembly.stream.el8`	RHSA-2024:2782
Red Hat OpenShift Container Platform 4.13	`openshift4/ose-oauth-server-rhel8:v4.13.0-202404200313.p0.geb54be2.assembly.stream.el8`	RHSA-2024:2047
Red Hat OpenShift Container Platform 4.14	`openshift4/ose-oauth-server-rhel8:v4.14.0-202310201027.p0.g37df9ff.assembly.stream`	RHSA-2023:5006

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2021-4294 in your dependencies?

Find it across Go, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

5.9/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Raw vector

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

CWE Classification

CWE-208CWE-208 CWE-203CWE-203

Weaponization

No Nuclei template, Metasploit module or public proof-of-concept found.

OpenSSF Scorecard

Package health score

osin

4.8/10

Maintained0/10

Code-Review7/10

Branch-ProtectionN/A

Assessed Oct 26, 2026

Timeline

Disclosed

Dec 28, 2022

Last updated

Oct 20, 2026

Identifiers

CVE-2021-4294

GHSA-m7qp-cj9p-gj85

GO-2022-1201

References

Advisorynvd.nist.gov · CVE 2021 4294 Fixgithub.com · 8612686d6dda34ae9ef6b5a974e4b7accb4fea29 Reportgithub.com Reportvuldb.com Reportvuldb.com Webpkg.go.dev · GO 2022 1201 Packagegithub.com · osin

Related vulnerabilities

This CVE is medium severity; 7 of 8 other CVEs with CWE-208 are rated as high or higher (top: critical).

CVE-2026-49265CVE-2026-58272CVE-2026-63132CVE-2026-77582CVE-2026-88010CVE-2026-85725CVE-2026-72701CVE-2026-84308Browse all CWE-208

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 20, 2026

CVE-2021-4294 — osin

EPSS Exploitation Probability

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

Description

Affected Packages

Affected Products

Detection & mitigation playbook

Detect

Fix

Workarounds

Fixing This On Your OS

Frequently Asked Questions

Is CVE-2021-4294 in your dependencies?