CVE-2020-15957

Name: CVE-2020-15957
Creator: NVD / NIST
Published: 2020-07-30T14:15:12.26+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.55%

Last modified Jun 17, 2026

CVE-2020-15957 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 1.55% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.55%

72.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-347

Affected Software

Vendor	Product	Versions
Dp3t-Backend-Software Development Kit Project	Dp3t-Backend-Software Development Kit	< 1.1.1

References

https://github.com/DP-3T/dp3t-sdk-backend/compare/v1.0.4...v1.1.0Release Notes, Third Party Advisory
https://github.com/DP-3T/dp3t-sdk-backend/security/advisories/GHSA-5m5q-3qw2-3xf3Patch, Third Party Advisory
https://github.com/dp-3T/dp3t-sdk-backendThird Party Advisory
https://github.com/DP-3T/dp3t-sdk-backend/compare/v1.0.4...v1.1.0Release Notes, Third Party Advisory
https://github.com/DP-3T/dp3t-sdk-backend/security/advisories/GHSA-5m5q-3qw2-3xf3Patch, Third Party Advisory
https://github.com/dp-3T/dp3t-sdk-backendThird Party Advisory

Timeline

Published: Jul 30, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-15957?

How severe is CVE-2020-15957?

CVE-2020-15957 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.55% probability of exploitation in the next 30 days.

How do I fix CVE-2020-15957?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-15957?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST