CVE-2020-15163

medium

Description

Python TUF (The Update Framework) reference implementation before version 0.12 it will incorrectly trust a previously downloaded root metadata file which failed verification at download time. This allows an attacker who is able to serve multiple new versions of root metadata (i.e. by a person-in-the-middle attack) culminating in a version which has not been correctly signed to control the trust chain for future updates. This is fixed in version 0.12 and newer.

References

Advisories
More

https://github.com/theupdateframework/tuf/security/advisories/GHSA-f8mr-jv2c-v8mg

https://github.com/theupdateframework/tuf/releases/tag/v0.12.0

https://github.com/theupdateframework/tuf/pull/885

https://pypi.org/project/tuf

https://github.com/theupdateframework/tuf/commit/3d342e648fbacdf43a13d7ba8886aaaf07334af7

Details

Source: Mitre, NVD

Published: 2020-09-09

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 4.9

Vector: CVSS2#AV:N/AC:M/Au:S/C:P/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 8.2

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

Severity: High

CVSS v4

Base Score: 6.3

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

Severity: Medium

EPSS

EPSS: 0.00144