CVE-2020-8161: canonical ubuntu_linux
Vulnerability summary
CVE-2020-8161 is a high (CVSS 8.6) vulnerability in canonical ubuntu_linux. EPSS estimates a 3.36% chance of exploitation in the next 30 days, higher than 88.7% of scored vulnerabilities.
Severe, CVSS 8.6 (NVD); no exploitation reported by the 5 checked sources; EPSS 3% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 8 · Related 4Timeline
- 02-07-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
A directory traversal vulnerability exists in rack < 2.2.0 that allows an attacker perform directory traversal vulnerability in the Rack::Directory app that is bundled with Rack which could result in information disclosure.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated8.6HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
- OSV · DebianEcosystem advisory · calculated8.6HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
- OSV · RubygemsEcosystem advisory · calculated8.6HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
EPSS trend
Probability
3.36%
Chance of exploitation in the next 30 days
Percentile
89%
Versus all other CVEs
30-day change
No change 0.00 pp
From 3.36% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-548Exposure of Information Through Directory ListingThe product inappropriately exposes a directory listing with an index of all the resources located inside of the directory.
- CWE-22Improper Limitation of a Pathname to a Restricted DirectoryThe product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
Affected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Debian2 products
- ruby-rack< 1.5.2-3+deb8u3 | < 2.1.1-5
- debian_linuxEOL9.0 | 10.0
Canonical1 product
- ubuntu_linuxEOL18.04
Rack_project1 product
- rack< 2.2.0
RubyGems1 product
- rack< 2.1.3
Ubuntu1 product
- ruby-rack< 1.6.4-3ubuntu0.2 | < 1.6.4-4ubuntu0.2 | < 2.0.7-2ubuntu0.1
5 vendors · 6 products
References
17 links
- groups.google.com/forum/REPORT
Show all 17 references
- github.com/rack/rackPACKAGE