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No exploitation reportedFix available

CVE-2020-11020

No exploitation reported by the sources we read.

  • Published2020-04-29
  • Fixed in1.2.5 · 1.1.3 · 1.0.4
  • WeaknessCWE-287

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

Faye (NPM, RubyGem) versions greater than 0.5.0 and before 1.0.4, 1.1.3 and 1.2.5, has the potential for authentication bypass in the extension system. The vulnerability allows any client to bypass checks put in place by server-side extensions, by appending extra segments to the message channel. It is patched in versions 1.0.4, 1.1.3 and 1.2.5.

Timeline

dates in UTC
  1. 2020-04-2918:15CVE publishedNVD

Versions per branch

NVD · OSV
Faye project faye
BranchAffectedFixed in
1.2≥ 1.2.0, < 1.2.51.2.5
1.1≥ 1.1.0, < 1.1.31.1.3
1.0> 0.5.0, < 1.0.41.0.4
1.0≥ 0.5.0, < 1.0.41.0.4

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

  • ruby-fayeUbuntu:24.04:LTSall versions · no fixed version listed
  • ruby-fayeUbuntu:22.04:LTSall versions · no fixed version listed
  • ruby-fayeUbuntu:20.04:LTSall versions · no fixed version listed
  • ruby-fayeDebian:12all versions · fixed in 1.4.0-1

Full record on NVD

Fix

  1. Update Faye project faye to 1.2.5 · 1.1.3 · 1.0.4

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CNACVSS 3.18.5known since 2026-10-23
  • NVDCVSS 3.19.8read 2026-10-23
  • NVDCVSS 2.07.5read 2026-10-23
  • CNAweakness (CWE)CWE-287known since 2026-10-23
  • NVDweakness (CWE)CWE-287read 2026-10-23
  • FIRST EPSSEPSS score1.6 %2026-11-09
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryHIGH2020-04-29

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2020-04-29
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-qpg4-4w7w-2mq5

Frequently asked questions

What is CVE-2020-11020?

Faye (NPM, RubyGem) versions greater than 0.5.0 and before 1.0.4, 1.1.3 and 1.2.5, has the potential for authentication bypass in the extension system. The vulnerability allows any client to bypass checks put in place by server-side extensions, by appending extra segments to the message channel. It is patched in versions 1.0.4, 1.1.3 and 1.2.5.

Is CVE-2020-11020 actively exploited?

Active exploitation of CVE-2020-11020 has not been confirmed. Its EPSS score was 1.6% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-11020?

CVE-2020-11020 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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