How severe is CVE-2020-15957?

CVE-2020-15957 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2020-15957 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-15957?

CVE-2020-15957 affects Dp3t-backend-software Development Kit Project Dp3t-backend-software Development Kit. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-15957?

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-2020-15957 published?

CVE-2020-15957 was published on 2020-07-30 and last updated on 2026-06-17.

CVE-2020-15957

CVE-2020-15957 is a high-severity vulnerability in Dp3t-backend-software Development Kit Project Dp3t-backend-software Development Kit with a CVSS 3.x base score of 7.5. 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-347.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-347
Affected product: Dp3t-backend-software Development Kit Project Dp3t-backend-software Development Kit
Published: 2020-07-30
Last modified: 2026-06-17

Description

An issue was discovered in DP3T-Backend-SDK before 1.1.1 for Decentralised Privacy-Preserving Proximity Tracing (DP3T). When it is configured to check JWT before uploading/publishing keys, it is possible to skip the signature check by providing a JWT token with alg=none.

Frequently asked questions

What is CVE-2020-15957?: An issue was discovered in DP3T-Backend-SDK before 1.1.1 for Decentralised Privacy-Preserving Proximity Tracing (DP3T). When it is configured to check JWT before uploading/publishing keys, it is possible to skip the signature check by providing a JWT token with alg=none.
How severe is CVE-2020-15957?: CVE-2020-15957 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2020-15957 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-15957?: CVE-2020-15957 affects Dp3t-backend-software Development Kit Project Dp3t-backend-software Development Kit. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-15957?: 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-2020-15957 published?: CVE-2020-15957 was published on 2020-07-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:dp3t-backend-software_development_kit_project:dp3t-backend-software_development_kit:*:*:*:*:*:*:*:*

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