What’s Vulnerable › Vulnerabilities

CVE-2020-15093: Improper verification of signature threshold in tough

• Severity: high (CVSS 8.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-07-09 · updated 2026-06-17
• Weakness: CWE-347

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.

Affected products

• AWS tough: before 0.7.1 — fixed in 0.7.1

How to fix

Upgrade to a fixed version: AWS tough 0.7.1. Check the vendor advisory for mitigations.

References

• https://crates.io/crates/tough
• https://github.com/awslabs/tough/security/advisories/GHSA-5q2r-92f9-4m49
• https://github.com/theupdateframework/tuf/commit/2977188139d065ff3356c3cb4aec60c582b57e0e
• https://github.com/theupdateframework/tuf/pull/974
• https://crates.io/crates/tough
• https://github.com/awslabs/tough/security/advisories/GHSA-5q2r-92f9-4m49
• https://github.com/theupdateframework/tuf/commit/2977188139d065ff3356c3cb4aec60c582b57e0e
• https://github.com/theupdateframework/tuf/pull/974

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