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CVE-2020-8161· NVD / CVE Program· CNA hackerone

A directory traversal vulnerability exists in rack < 2.2.0 that allows an attacker perform directory traversal vulnerability in the Rack::Di

Noroxi assessment

Priority: Monitor (action score 35/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 3.3% (FIRST EPSS); higher than 88.5% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: ruby-rack (Debian:10) 2.0.6-3+deb10u2; ruby-rack (Debian:12) 2.1.1-5; ruby-rack (Debian:8) 1.5.2-3+deb8u3.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to ruby-rack (Debian:10) 2.0.6-3+deb10u2; ruby-rack (Debian:12) 2.1.1-5; ruby-rack (Debian:8) 1.5.2-3+deb8u3 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 8.6 · v3.1—No exploit Fix available
Published
Jul 2, 2020
Updated
Jun 16, 2026
EPSS
3.3% · 88th percentile

Report tools

JSON

Action score

35

Monitor

Low priority for now.

CVSS
34 / 40 · 8.6 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 3.3%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
rack projectrack
debiandebian linux
canonicalubuntu linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • canonical ubuntu linux18.04
  • debian debian linux10.0
  • debian debian linux9.0
  • rack project rackbefore 2.2.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (hackerone). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a https://github.com/rack/rack

    • Fixed in 2.1.3, >= 2.2.0affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:10ruby-rackbefore 2.0.6-3+deb10u22.0.6-3+deb10u2
Debian:12ruby-rackbefore 2.1.1-52.1.1-5
Debian:8ruby-rackbefore 1.5.2-3+deb8u31.5.2-3+deb8u3
Debian:9ruby-rackbefore 1.6.4-4+deb9u21.6.4-4+deb9u2
RubyGemsrackbefore 2.1.32.1.3
SUSE:Linux Enterprise High Availability Extension 15rubygem-rackbefore 2.0.8-150000.3.9.12.0.8-150000.3.9.1
SUSE:Linux Enterprise High Availability Extension 15rubygem-rackbefore 2.0.8-150000.3.9.12.0.8-150000.3.9.1
SUSE:OpenStack Cloud 7rubygem-rackbefore 1.6.13-3.8.11.6.13-3.8.1

Same product

rack project: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-30123A sequence injection vulnerability exists in Rack <2.0.9.1, <2.1.4.1 and <2.2.3.1 which could allow is a possible shell escape in the Lint a
    41Plan
  • CVE-2022-30122A possible denial of service vulnerability exists in Rack <2.0.9.1, <2.1.4.1 and <2.2.3.1 in the multipart parsing component of Rack.
    31Monitor
  • CVE-2020-8184A reliance on cookies without validation/integrity check security vulnerability exists in rack < 2.2.3, rack < 2.1.4 that makes it is possib
    31Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2015-3225Jul 26, 2015 · lib/rack/utils.rb in Rack before 1.5.4 and 1.6.x before 1.6.2, as used with Ruby on Rails 3.x and 4.x and other products, allows remote atta
    22Monitor
  • ← EarlierCVE-2018-16470Nov 13, 2018 · There is a possible DoS vulnerability in the multipart parser in Rack before 2.0.6.
    31Monitor
  • ← EarlierCVE-2018-16471Nov 13, 2018 · There is a possible XSS vulnerability in Rack before 2.0.6 and 1.6.11.
    25Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:ruby-rack2.1.1-5 · Debian:12Package registry (OSV)
opensuse:rubygem-rack2.0.8-150000.3.9.1 · openSUSE:Leap 15.3Package registry (OSV)
RubyGems:rack2.1.3Package registry (OSV)
suse:rubygem-rack1.6.13-3.8.1 · SUSE:OpenStack Cloud 7Package registry (OSV)
suse:rubygem-rack2.0.8-150000.3.9.1 · SUSE:Linux Enterprise High Availability Extension 15Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-548 · Exposure of Information Through Directory Listing

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records