CVE-2020-8163

CRITICALNVD 8.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because EPSS predicts 82% probability of exploitation within the next 30 days (top 0.4% of all CVEs). NVD baseline CVSS 8.8 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, nvd
Elevated
9.0EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 82%
CISA-KEV: Not listedEPSS PROB: 82%CVSS: 8.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
8.8
EG Score
9.0(high)
EG Risk
78(Track)
EG Risk 78/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation82% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
82%
EPSS %ILE
100%
KEV
Not listed

Published

July 2, 2020

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated Aug 24, 2026
Patch available.
generic Patch Available

[SECURITY] [DLA 2282-1] rails security update

https://lists.debian.org/debian-lts-announce/2020/07/msg00013.html
generic
https://groups.google.com/g/rubyonrails-security/c/hWuKcHyoKh0

Affected Packages

(6 across 6 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
rails—2:5.2.0+dfsg-2—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
rails—2:5.2.0+dfsg-2—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
rails—2:5.2.0+dfsg-2—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
rails—2:5.2.0+dfsg-2—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
rails2:4.2.7.1-1, 2:4.2.7.1-1+deb9u1, 2:4.2.7.1-1+deb9u22:4.2.7.1-1+deb9u3—
RubyGems(1)
PackageVulnerable rangeFixed inDependents
actionview4.1.0 ... 4.2.9.rc2 (78 versions)4.2.11.3—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 4× in last 7d / 14× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-18 19:23 UTCEPSS rescore
  2. 2026-09-17 19:22 UTCEPSS rescore
  3. 2026-09-16 14:04 UTCEPSS rescore
  4. 2026-09-12 14:57 UTCEPSS rescore
  5. 2026-09-08 21:56 UTCEPSS rescore
  6. 2026-09-07 07:18 UTCOSV refresh
  7. 2026-09-06 13:44 UTCEPSS rescore
  8. 2026-09-05 15:25 UTCEPSS rescore
  9. 2026-09-04 05:03 UTCEPSS rescore
  10. 2026-08-30 19:14 UTCEPSS rescore
  11. 2026-08-28 21:37 UTCEPSS rescore
  12. 2026-08-26 14:42 UTCEPSS rescore
  13. 2026-08-21 23:45 UTCEPSS rescore
  14. 2026-08-20 17:01 UTCOSV refresh
  15. 2026-08-19 17:00 UTCEPSS rescore
  16. 2026-08-16 02:11 UTCEPSS rescore
  17. 2026-08-13 21:57 UTCEPSS rescore
  18. 2026-08-12 13:47 UTCEPSS rescore
  19. 2026-08-05 19:14 UTCEPSS rescore
  20. 2026-08-05 10:41 UTCOSV refresh
  21. 2026-08-02 02:24 UTCEPSS rescore
  22. 2026-07-30 16:25 UTCEPSS rescore
  23. 2026-07-30 01:27 UTCEPSS rescore
  24. 2026-07-26 14:52 UTCEPSS rescore
  25. 2026-07-25 14:15 UTCEPSS rescore
Show 56 more
  1. 2026-07-24 14:15 UTCEPSS rescore
  2. 2026-07-23 01:55 UTCEG score recompute▲ 0.20
  3. 2026-07-22 22:41 UTCEG score recompute▼ 0.20
  4. 2026-07-22 14:05 UTCEPSS rescore
  5. 2026-07-21 15:22 UTCEPSS rescore
  6. 2026-07-21 15:22 UTCEPSS rescore
  7. 2026-07-20 17:04 UTCEPSS rescore
  8. 2026-07-20 17:04 UTCEPSS rescore
  9. 2026-07-19 09:52 UTCOSV refresh
  10. 2026-07-19 02:26 UTCEPSS rescore
  11. 2026-07-19 02:26 UTCEPSS rescore
  12. 2026-07-18 10:02 UTCEPSS rescore
  13. 2026-07-16 17:00 UTCEPSS rescore
  14. 2026-07-15 16:55 UTCEPSS rescore
  15. 2026-07-15 16:55 UTCEPSS rescore
  16. 2026-07-12 05:44 UTCEPSS rescore
  17. 2026-07-12 05:44 UTCEPSS rescore
  18. 2026-07-09 19:07 UTCEPSS rescore
  19. 2026-07-04 06:29 UTCEPSS rescore
  20. 2026-07-04 06:29 UTCEPSS rescore
  21. 2026-07-02 16:57 UTCEPSS rescore
  22. 2026-07-01 15:31 UTCOSV refresh
  23. 2026-06-27 03:06 UTCEPSS rescore
  24. 2026-06-27 03:06 UTCEPSS rescore
  25. 2026-06-24 14:03 UTCEPSS rescore
  26. 2026-06-24 14:03 UTCEPSS rescore
  27. 2026-06-23 21:31 UTCEPSS rescore
  28. 2026-06-23 21:31 UTCEPSS rescore
  29. 2026-06-22 14:23 UTCEPSS rescore
  30. 2026-06-21 14:54 UTCEPSS rescore
  31. 2026-06-21 14:54 UTCEPSS rescore
  32. 2026-06-21 01:57 UTCEPSS rescore
  33. 2026-06-21 01:57 UTCEPSS rescore
  34. 2026-06-17 17:50 UTCEPSS rescore
  35. 2026-06-15 17:46 UTCEPSS rescore
  36. 2026-06-14 23:15 UTCEPSS rescore
  37. 2026-06-13 23:43 UTCOSV refresh
  38. 2026-06-13 22:58 UTCEPSS rescore
  39. 2026-06-13 22:58 UTCEPSS rescore
  40. 2026-06-12 23:10 UTCEPSS rescore
  41. 2026-06-12 23:10 UTCEPSS rescore
  42. 2026-06-10 22:16 UTCEPSS rescore
  43. 2026-06-10 13:20 UTCEPSS rescore
  44. 2026-06-07 15:23 UTCEPSS rescore
  45. 2026-06-07 15:23 UTCEPSS rescore
  46. 2026-06-05 22:45 UTCEPSS rescore
  47. 2026-06-05 22:45 UTCEPSS rescore
  48. 2026-06-05 06:08 UTCEPSS rescore
  49. 2026-06-05 06:08 UTCEPSS rescore
  50. 2026-05-31 00:15 UTCEPSS rescore
  51. 2026-05-31 00:15 UTCEPSS rescore
  52. 2026-05-28 13:43 UTCEPSS rescore
  53. 2026-05-28 13:43 UTCEPSS rescore
  54. 2026-05-27 01:39 UTCEG score recompute
  55. 2026-05-26 13:42 UTCEPSS rescore
  56. 2026-05-26 13:42 UTCEPSS rescore

Publicly available exploits

(4 references)

Working exploit code is in the public domain (2 GitHub PoCs) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-48716
    First seen Jul 26, 2020

    Rails 5.0.1 - Remote Code Execution

    Open source ↗
  • GitHub PoCh4ms1k/CVE-2020-8163
    First seen Jul 18, 2020

    Enviroment and exploit to rce test

    Open source ↗
  • GitHub PoClucasamorimca/CVE-2020-8163
    First seen Jun 19, 2020

    CVE-2020-8163 - Remote code execution of user-provided local names in Rails

    Open source ↗
  • Nucleihttp/cves/2020/CVE-2020-8163.yaml
    First seen Jan 1, 2020

    Ruby on Rails <5.0.1 - Remote Code Execution

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2020-8163?
CVE-2020-8163 is a critical vulnerability published on July 2, 2020. 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.
When was CVE-2020-8163 disclosed?
CVE-2020-8163 was first published in the National Vulnerability Database on July 2, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-8163 actively exploited?
CVE-2020-8163 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 82% probability of exploitation in the next 30 days, which ranks it in the top 0.4% of all scored CVEs.
What is the CVSS score of CVE-2020-8163?
CVE-2020-8163 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
How do I remediate CVE-2020-8163?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-8163, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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