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Public proof of conceptFix available

CVE-2020-8163

A public proof of concept exists; no exploitation attested.

  • Published2020-07-02
  • Fixed in5.0.1
  • WeaknessCWE-94

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The is a code injection vulnerability in versions of Rails prior to 5.0.1 that wouldallow an attacker who controlled the `locals` argument of a `render` call to perform a RCE.

Timeline

dates in UTC
  1. 2020-07-0219:15CVE publishedNVD
  2. 2020-07-26Exploit-DB entryExploit-DB

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-8163?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-8163?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Ruby on Rails
BranchAffectedFixed in
5.0< 5.0.15.0.1
Debian debian linux
BranchAffectedFixed in
9.0= 9.0no fix published
actionview
BranchAffectedFixed in
4.2< 4.2.11.34.2.11.3

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • railsUbuntu:Pro:22.04:LTSall versions · no fixed version listed
  • railsUbuntu:Pro:20.04:LTSall versions · no fixed version listed
  • railsUbuntu:Pro:18.04:LTSall versions · no fixed version listed
  • railsUbuntu:Pro:16.04:LTSall versions · no fixed version listed
  • railsUbuntu:26.10all versions · no fixed version listed
  • railsUbuntu:26.04:LTSall versions · no fixed version listed
  • railsUbuntu:25.10all versions · no fixed version listed
  • railsUbuntu:24.04:LTSall versions · no fixed version listed

12 more package ranges on OSV.dev

Vendor advisories

  • CVE-2020-8163 Red Hat Product Security

    rubygem-rails: potential remote code execution of user-provided local names

Full record on NVD

Fix

  1. Update Ruby on Rails to 5.0.1

Advisories and patches

Detection

read 2026-11-03 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
EDB-48716
Exploit-DB
Proof-of-concept repositories
3 repositories, unverifiedlucasamorimca/CVE-2020-8163h4ms1k/CVE-2020-8163RedBinaryRabbit/CVE-2020-8163
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2020-07-02
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-cr3x-7m39-c6jq

Frequently asked questions

What is CVE-2020-8163?

The is a code injection vulnerability in versions of Rails prior to 5.0.1 that wouldallow an attacker who controlled the `locals` argument of a `render` call to perform a RCE.

Is CVE-2020-8163 actively exploited?

Active exploitation of CVE-2020-8163 has not been confirmed. Its EPSS score was 82.5% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-8163?

CVE-2020-8163 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record