6.1

CVE-2021-27520: fudforum Cross-site Scripting

CVSS: 6.1v3.1MediumModified
Published 19-03-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-27520 is a medium (CVSS 6.1) Cross-site Scripting vulnerability in fudforum. EPSS estimates a 6.40% chance of exploitation in the next 30 days, higher than 93.6% of scored vulnerabilities. 3 public exploits are recorded.

Overall risk
36/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.1/10
010
Medium · v3.1 (NVD)
EPSS score
6.40%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits3github, reference, exploit-database

Timeline

  1. 19-03-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

A cross-site scripting (XSS) issue in FUDForum 3.1.0 allows remote attackers to inject JavaScript via index.php in the "author" parameter.

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

6.40%

Chance of exploitation in the next 30 days

Percentile

94%

Versus all other CVEs

30-day change

0.00 pp

From 6.40% on 20-09-2026

20-09-202620-10-2026
EPSS score
6.40%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

3 found
  • githubUnverified

    Fudforum

    Maturity: poc

  • referenceUnverified

    Exploit Reference (packetstormsecurity.com)

    Maturity: unknown

  • exploit-databasephpUnverified

    FUDForum 3.1.0 - 'author' Reflected XSS

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Fudforum1 product

1 vendor · 1 product

References

2 links