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NVD / CVE Program· CNA hackerone

CVE-2020-8162: A client side enforcement of server side security vulnerability exists in rails < 5.2.4.2 and rails < 6.0.3.1 ActiveStorage's S3 adapter tha

Noroxi assessment

Priority: Monitor (action score 31/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 3% (FIRST EPSS); higher than 87.4% 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: rails (Debian:10) 2:5.2.2.1+dfsg-1+deb10u2; rails (Debian:12) 2:5.2.4.3+dfsg-1; rubygem-activestorage-6.0 (openSUSE:Tumbleweed) 6.0.4.4-1.1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to rails (Debian:10) 2:5.2.2.1+dfsg-1+deb10u2; rails (Debian:12) 2:5.2.4.3+dfsg-1; rubygem-activestorage-6.0 (openSUSE:Tumbleweed) 6.0.4.4-1.1 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 client side enforcement of server side security vulnerability exists in rails < 5.2.4.2 and rails < 6.0.3.1 ActiveStorage's S3 adapter that allows the Content-Length of a direct file upload to be modified by an end user bypassing upload limits.

HighCVSS 7.5 · v3.1—Proof of concept Fix available
Published
Jun 19, 2020
Updated
Jun 16, 2026
EPSS
3.0% · 87th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 3.0%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

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

Follow CVE-2020-8162

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
rubyonrailsrails
debiandebian linux

Affected versions

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

  • debian debian linux10.0
  • rubyonrails railsbefore 5.2.4.2
  • rubyonrails rails6.0.0 and later · before 6.0.3.1

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/rails/rails

    • rails >= 5.2.4.3, rails >= 6.0.3.1affected

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:10railsbefore 2:5.2.2.1+dfsg-1+deb10u22:5.2.2.1+dfsg-1+deb10u2
Debian:12railsbefore 2:5.2.4.3+dfsg-12:5.2.4.3+dfsg-1
openSUSE:Tumbleweedrubygem-activestorage-6.0before 6.0.4.4-1.16.0.4.4-1.1
Red Hat:satellite_capsule:6.9::el7ansible-collection-redhat-satellitebefore 0:2.0.1-1.el7sat0:2.0.1-1.el7sat
Red Hat:satellite_capsule:6.9::el7ansible-runnerbefore 0:1.4.6-1.el7ar0:1.4.6-1.el7ar
Red Hat:satellite_capsule:6.9::el7ansiblerole-foreman_scap_clientbefore 0:0.1.0-1.el7sat0:0.1.0-1.el7sat
Red Hat:satellite_capsule:6.9::el7ansiblerole-insights-clientbefore 0:1.7.1-1.el7sat0:1.7.1-1.el7sat
Red Hat:satellite_capsule:6.9::el7ansiblerole-satellite-receptor-installerbefore 0:0.6.13-1.el7sat0:0.6.13-1.el7sat
Red Hat:satellite_capsule:6.9::el7crane-selinuxbefore 0:3.5.1-1.el7sat0:3.5.1-1.el7sat
Red Hat:satellite_capsule:6.9::el7createrepo_cbefore 0:0.17.1-1.el7pc0:0.17.1-1.el7pc
Red Hat:satellite_capsule:6.9::el7createrepo_c-debuginfobefore 0:0.17.1-1.el7pc0:0.17.1-1.el7pc
Red Hat:satellite_capsule:6.9::el7createrepo_c-libsbefore 0:0.17.1-1.el7pc0:0.17.1-1.el7pc
Red Hat:satellite_capsule:6.9::el7foremanbefore 0:2.3.1.20-1.el7sat0:2.3.1.20-1.el7sat
Red Hat:satellite_capsule:6.9::el7foreman-bootloaders-redhatbefore 0:202005201200-1.el7sat0:202005201200-1.el7sat
Red Hat:satellite_capsule:6.9::el7foreman-bootloaders-redhat-tftpbootbefore 0:202005201200-1.el7sat0:202005201200-1.el7sat
Red Hat:satellite_capsule:6.9::el7foreman-debugbefore 0:2.3.1.20-1.el7sat0:2.3.1.20-1.el7sat
Red Hat:satellite_capsule:6.9::el7foreman-discovery-imagebefore 1:3.7.4-2.el7sat1:3.7.4-2.el7sat
Red Hat:satellite_capsule:6.9::el7foreman-discovery-image-servicebefore 0:1.0.0-4.el7sat0:1.0.0-4.el7sat
Red Hat:satellite_capsule:6.9::el7foreman-discovery-image-service-tuibefore 0:1.0.0-4.el7sat0:1.0.0-4.el7sat
Red Hat:satellite_capsule:6.9::el7foreman-installerbefore 1:2.3.1.10-1.el7sat1:2.3.1.10-1.el7sat
Red Hat:satellite_capsule:6.9::el7foreman-installer-katellobefore 1:2.3.1.10-1.el7sat1:2.3.1.10-1.el7sat
Red Hat:satellite_capsule:6.9::el7foreman-proxybefore 0:2.3.1-1.el7sat0:2.3.1-1.el7sat
Red Hat:satellite_capsule:6.9::el7foreman-proxy-contentbefore 0:3.18.1-3.el7sat0:3.18.1-3.el7sat
Red Hat:satellite_capsule:6.9::el7foreman-proxy-journaldbefore 0:2.3.1-1.el7sat0:2.3.1-1.el7sat

+96

Same product

rubyonrails: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-5418There is a File Content Disclosure vulnerability in Action View <5.2.2.1, <5.1.6.2, <5.0.7.2, <4.2.11.1 and v3 where specially crafted accepKEV
    90Now
  • CVE-2016-0752Directory traversal vulnerability in Action View in Ruby on Rails before 3.2.22.1, 4.0.x and 4.1.x before 4.1.14.1, 4.2.x before 4.2.5.1, anKEV
    89Now
  • CVE-2019-5420A remote code execution vulnerability in development mode Rails <5.2.2.1, <6.0.0.beta3 can allow an attacker to guess the automatically gene
    66This week

Published before and after this one in the same product

  • ← EarlierCVE-2019-5419Mar 27, 2019 · There is a possible denial of service vulnerability in Action View (Rails) <5.2.2.1, <5.1.6.2, <5.0.7.2, <4.2.11.1 where specially crafted a
    33Monitor
  • ← EarlierCVE-2010-3299Nov 12, 2019 · The encrypt/decrypt functions in Ruby on Rails 2.3 are vulnerable to padding oracle attacks.
    26Monitor
  • Later →CVE-2020-8164Jun 19, 2020 · A deserialization of untrusted data vulnerability exists in rails < 5.2.4.3, rails < 6.0.3.1 which can allow an attacker to supply informati
    31Monitor

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:rails2:5.2.4.3+dfsg-1 · Debian:12Package registry (OSV)
opensuse:rubygem-activestorage-6.06.0.4.4-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:ansible-collection-redhat-satellite0:2.0.1-1.el7sat · Red Hat:satellite_capsule:6.9::el7Package registry (OSV)
red hat:ansible-runner0:1.4.6-1.el7ar · Red Hat:satellite_capsule:6.9::el7Package registry (OSV)
red hat:ansiblerole-foreman_scap_client0:0.1.0-1.el7sat · Red Hat:satellite_capsule:6.9::el7Package registry (OSV)
red hat:ansiblerole-insights-client0:1.7.1-1.el7sat · Red Hat:satellite_capsule:6.9::el7Package registry (OSV)
red hat:ansiblerole-satellite-receptor-installer0:0.6.13-1.el7sat · Red Hat:satellite_capsule:6.9::el7Package registry (OSV)
red hat:crane-selinux0:3.5.1-1.el7sat · Red Hat:satellite_capsule:6.9::el7Package registry (OSV)
red hat:createrepo_c0:0.17.1-1.el7pc · Red Hat:satellite_capsule:6.9::el7Package registry (OSV)
red hat:createrepo_c-debuginfo0:0.17.1-1.el7pc · Red Hat:satellite_capsule:6.9::el7Package registry (OSV)
red hat:createrepo_c-libs0:0.17.1-1.el7pc · Red Hat:satellite_capsule:6.9::el7Package registry (OSV)
red hat:foreman0:2.3.1.20-1.el7sat · Red Hat:satellite_capsule:6.9::el7Package registry (OSV)
red hat:foreman-bootloaders-redhat0:202005201200-1.el7sat · Red Hat:satellite_capsule:6.9::el7Package registry (OSV)
red hat:foreman-bootloaders-redhat-tftpboot0:202005201200-1.el7sat · Red Hat:satellite_capsule:6.9::el7Package registry (OSV)
RubyGems:activestorage5.2.4.3Package registry (OSV)
RubyGems:activestorage6.0.3.1Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02020-04-05

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.

  1. First PoC-76 d
  2. Published
  3. TodayOct 29, 2026+2323 d
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

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

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
none
Integrity
high · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
High
Availability impact
None

Weakness class (CWE)

CWE-602 · Client-Side Enforcement of Server-Side Security

CVSS vector

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

Change log

  1. Fix✗ → ✓

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

References

Show all references (1 more)

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

All records