CVE-2020-15957: An issue was discovered in DP3T-Backend-SDK before 1.1.1 for Decentralised Privacy-Preserving Proximity Tracin

Q: How do I fix CVE-2020-15957?

dp3t-backend-software development kit: upgrade to 1.1.1. Exact commands for each OS are on this page.

Q: Is CVE-2020-15957 being exploited?

CVE-2020-15957 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-2020-15957 affect?

CVE-2020-15957 affects dp3t-backend-software development kit. Severity is high (CVSS 7.5). 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 provi

Q: How urgent is CVE-2020-15957?

Priority 49/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2020-15957 is a high-severity flaw (CVSS 7.5) affecting dp3t-backend-software development kit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-347
Published	2020-07-30
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: dp3t-backend-software development kit project

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

Am I affected?

Timeline

2020-07-30 14:15 UTCPublished CVE record published
2026-06-17 02:57 UTCUpdated Record last modified

dp3t-backend-software development kit project dp3t-backend-software development kit UPGRADE

Affected: < 1.1.1

Fixed in: 1.1.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy dp3t-backend-software-development-kit || rpm -q dp3t-backend-software-development-kit || dp3t-backend-software-development-kit --version

2. UPGRADE to 1.1.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade dp3t-backend-software-development-kit

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade dp3t-backend-software-development-kit

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-2020-15957?

dp3t-backend-software development kit: upgrade to 1.1.1. Exact commands for each OS are on this page.

Is CVE-2020-15957 being exploited?

CVE-2020-15957 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-2020-15957 affect?

CVE-2020-15957 affects dp3t-backend-software development kit. Severity is high (CVSS 7.5). 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 provi

How urgent is CVE-2020-15957?

Priority 49/100. High severity; Remotely exploitable, no login, no user action

References

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