CVE-2020-15093

Name: CVE-2020-15093
Creator: NVD / NIST
Published: 2020-07-09T19:15:11.413+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.6/10EPSS 1.36%

Last modified Jun 17, 2026

CVE-2020-15093 is a high-severity vulnerability rated 8.6/10 on the CVSS scale. The tough library (Rust/crates.io) prior to version 0.7.1 does not properly verify the threshold of cryptographic signatures. It allows an attacker to duplicate a valid signature in order to circumvent TUF requiring a minimum threshold of unique signatures before the metadata is considered valid. EPSS estimates a 1.36% chance of exploitation in the next 30 days.

Description

The tough library (Rust/crates.io) prior to version 0.7.1 does not properly verify the threshold of cryptographic signatures. It allows an attacker to duplicate a valid signature in order to circumvent TUF requiring a minimum threshold of unique signatures before the metadata is considered valid. A fix is available in version 0.7.1. CVE-2020-6174 is assigned to the same vulnerability in the TUF reference implementation.

Metrics

CVSS 3.1

8.6/10

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

EPSS Probability

1.36%

68.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Amazon	Tough	< 0.7.1

References

https://crates.io/crates/toughThird Party Advisory
https://github.com/awslabs/tough/security/advisories/GHSA-5q2r-92f9-4m49Third Party Advisory
https://github.com/theupdateframework/tuf/commit/2977188139d065ff3356c3cb4aec60c582b57e0ePatch, Third Party Advisory
https://github.com/theupdateframework/tuf/pull/974Issue Tracking, Patch, Third Party Advisory
https://crates.io/crates/toughThird Party Advisory
https://github.com/awslabs/tough/security/advisories/GHSA-5q2r-92f9-4m49Third Party Advisory
https://github.com/theupdateframework/tuf/commit/2977188139d065ff3356c3cb4aec60c582b57e0ePatch, Third Party Advisory
https://github.com/theupdateframework/tuf/pull/974Issue Tracking, Patch, Third Party Advisory

Timeline

Published: Jul 9, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-15093?

How severe is CVE-2020-15093?

CVE-2020-15093 has a CVSS score of 8.6/10 (HIGH severity). The EPSS model estimates a 1.36% probability of exploitation in the next 30 days.

How do I fix CVE-2020-15093?

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-2020-15093?

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

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Source: NVD / NIST