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Vulnerability record · CVE-2020-15093 · published 9 July 2020

CVE-2020-15093: Amazon tough improper verification of cryptographic signature vulnerability

Amazon · Tough

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.

8.6 CVSS 3.1 High EPSS 1.4% · top 29.5% CWE-347 · Improper verification of cryptographic signature
8.6CVSS 3.1 base score, v2 5.0
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://crates.io/crates/tough Third Party Advisory
https://github.com/awslabs/tough/security/advisories/GHSA-5q2r-92f9-4m49 Third Party Advisory
https://github.com/theupdateframework/tuf/commit/2977188139d065ff3356c3cb4aec60c582b57e0e PatchThird Party Advisory
https://github.com/theupdateframework/tuf/pull/974 Issue TrackingPatchThird Party Advisory
https://crates.io/crates/tough Third Party Advisory
https://github.com/awslabs/tough/security/advisories/GHSA-5q2r-92f9-4m49 Third Party Advisory
https://github.com/theupdateframework/tuf/commit/2977188139d065ff3356c3cb4aec60c582b57e0e PatchThird Party Advisory
https://github.com/theupdateframework/tuf/pull/974 Issue TrackingPatchThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2020-15093), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.