How severe is CVE-2020-15222?

CVE-2020-15222 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2020-15222 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-15222?

CVE-2020-15222 affects Ory Fosite. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-15222?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-15222 published?

CVE-2020-15222 was published on 2020-09-24 and last updated on 2026-06-17.

CVE-2020-15222

CVE-2020-15222 is a high-severity vulnerability in Ory Fosite with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-345.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 5.8
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-345
Affected product: Ory Fosite
Published: 2020-09-24
Last modified: 2026-06-17

Description

In ORY Fosite (the security first OAuth2 & OpenID Connect framework for Go) before version 0.31.0, when using "private_key_jwt" authentication the uniqueness of the `jti` value is not checked. When using client authentication method "private_key_jwt", OpenId specification says the following about assertion `jti`: "A unique identifier for the token, which can be used to prevent reuse of the token. These tokens MUST only be used once, unless conditions for reuse were negotiated between the parties". Hydra does not seem to check the uniqueness of this `jti` value. This problem is fixed in version 0.31.0.

Frequently asked questions

What is CVE-2020-15222?: In ORY Fosite (the security first OAuth2 & OpenID Connect framework for Go) before version 0.31.0, when using "private_key_jwt" authentication the uniqueness of the `jti` value is not checked. When using client authentication method "private_key_jwt", OpenId specification says the following about assertion `jti`: "A unique identifier for the token, which can be used to prevent reuse of the token. These tokens MUST only be used once, unless conditions for reuse were negotiated between the parties". Hydra does not seem to check the uniqueness of this `jti` value. This problem is fixed in version 0.31.0.
How severe is CVE-2020-15222?: CVE-2020-15222 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2020-15222 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-15222?: CVE-2020-15222 affects Ory Fosite. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-15222?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-15222 published?: CVE-2020-15222 was published on 2020-09-24 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:ory:fosite:*:*:*:*:*:*:*:*

More vulnerabilities in Ory Fosite

CVE-2020-15223 — High (CVSS 8.0): In ORY Fosite (the security first OAuth2 & OpenID Connect framework for Go) before version 0.34.0, the…
CVE-2020-15234 — Medium (CVSS 6.1): ORY Fosite is a security first OAuth2 & OpenID Connect framework for Go. In Fosite before version 0.34.1, the OAuth 2.0…
CVE-2020-15233 — Medium (CVSS 6.1): ORY Fosite is a security first OAuth2 & OpenID Connect framework for Go. In Fosite from version 0.30.2 and before…

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