Improper Verification of Cryptographic Signature in tough - CVE-2020-15093
Published: July 9, 2020 / Updated: April 25, 2026
Vulnerability identifier: #VU127898
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-15093
CWE-ID: CWE-347
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to bypass signature threshold verification.
The vulnerability exists due to improper uniqueness verification of cryptographic signatures in signature threshold verification when validating signed metadata. A remote user can provide multiple valid signatures generated with the same signing key to bypass signature threshold verification.
Exploitation requires access to a valid signing key.
Affected software
tough
How to mitigate CVE-2020-15093
Install security update from vendor's website.
tough - update to 0.7.1