9.8

CVE-2020-11020: faye_project faye Improper Authentication

CVSS: 9.8v3.1CriticalModified
AliasesUBUNTU-CVE-2020-11020DEBIAN-CVE-2020-11020GHSA-qpg4-4w7w-2mq5
Published 29-04-2020Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2020-11020 is a critical (CVSS 9.8) Improper Authentication vulnerability in faye_project faye. EPSS estimates a 1.57% chance of exploitation in the next 30 days, higher than 75.1% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
1.57%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Timeline

  1. 29-04-2020
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

6 scores · 5 sources · 2 versions

EPSS trend

Probability

1.57%

Chance of exploitation in the next 30 days

Percentile

75%

Versus all other CVEs

30-day change

0.00 pp

From 1.57% on 21-09-2026

21-09-202621-10-2026
EPSS score
1.57%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Faye

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • ruby-faye< 1.4.0-1
Faye1 product
  • faye≥ 0.5.0, < 1.0.4 | ≥ 1.1.0, < 1.1.3 | ≥ 1.2.0, < 1.2.5
Faye_project1 product
  • faye> 0.5.0, < 1.0.4 | ≥ 1.1.0, < 1.1.3 | ≥ 1.2.0, < 1.2.5
RubyGems1 product
  • faye≥ 0.5.0, < 1.0.4 | ≥ 1.1.0, < 1.1.3 | ≥ 1.2.0, < 1.2.5
Ubuntu1 product
  • ruby-fayeAll versions (No fix recorded)

5 vendors · 5 products

References

8 links