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CVE-2020-15163

20
FAUCET Score

CVE-2020-15163 affects the Python TUF (The Update Framework) reference implementation prior to version 0.12. It allows an attacker to control the trust chain for future updates by exploiting a flaw where previously downloaded, but failed-to-verify, root metadata files are incorrectly trusted. This vulnerability carries a high CVSS score of 8.2 due to its network attack vector, high impact on confidentiality and integrity, and the potential for a sophisticated attacker to perform a man-in-the-middle attack. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.12.0CPE matchmatch criteria
cpe:2.3:a:linuxfoundation:the_update_framework:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.7HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.3
Impact Score
5.8
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.67%
Probability of exploitation in next 30 days
EPSS Percentile
48.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0067 is in the 45th percentile among its peer group of 1,162 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: tufFixed in: 0.12.0

Vendor Advisories (1)

pipGHSA-f8mr-jv2c-v8mgmedium

Invalid root may become trusted root in The Update Framework (TUF)

Sep 9, 2020

References

github.com / theupdateframework/tuf/commit/3d342e648fbacdf43a13d7ba8886aaaf07334af7
Broken Link
github.com / theupdateframework/tuf/pull/885
PatchThird Party Advisory
github.com / theupdateframework/tuf/releases/tag/v0.12.0
Third Party Advisory
github.com / theupdateframework/tuf/security/advisories/GHSA-f8mr-jv2c-v8mg
Third Party Advisory
pypi.org / project/tuf
ProductVendor Advisory