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TI-2021-02584 Aliases CVE-2021-3639GHSA-mhcv-7w89-jjj5

Open redirect in mod_auth_mellon

Priority LOW 29CWE-601Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Spoofing
Confidentiality · integrity · availability
Low · Low · None
Fix status
Partial Red Hat: 1 fixed, 3 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-601.

Summary

A flaw was found in mod_auth_mellon where it does not sanitize logout URLs properly. This issue could be used by an attacker to facilitate phishing attacks by tricking users into visiting a trusted web application URL that redirects to an external and potentially malicious server. The highest threat from this liability is to confidentiality and integrity.

Why it matters now

EPSS 0.01031 63rd percentileScored 2026-11-07
Fix Partial Red Hat: 1 advisoryRed Hat: 1 fixed, 3 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
—mod_auth_mellonFixed in v0.18.0—No fix listedCNA
  • mod_auth_mellon Vendor— Affected Fixed in v0.18.0 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:uninett:mod_auth_mellon:*:*:*:*:*:*:*:*before 0.18.0Vulnerableuninett
  • cpe:2.3:a:uninett:mod_auth_mellon:*:*:*:*:*:*:*:* Versions before 0.18.0 Vulnerable ·uninett

Remediation

Red Hat 1 advisory

  • RHSA-2022:1934 Released 2022-05-10 · Red Hat rating Moderate
    mod_auth_mellon security update
    • Red Hat Enterprise Linux AppStream (v. 8) mod_auth_mellon-0.14.0-12.el8.1, mod_auth_mellon-diagnostics-0.14.0-12.el8.1

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat Software CollectionsAffectedNo fix planned: Will not fix
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2022:1934
Not affected: 1 product
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-3639
  2. 2026-10-03 Alias added: GHSA-mhcv-7w89-jjj5

References

Patch 2

Advisory 1

  • TI-2014-07039 The mod_auth_mellon module before 0.8.1 allows remote attackers to cause a denial of… CVSS 2.0HIGH 9.4
  • TI-2016-01957 The am_read_post_data function in mod_auth_mellon before 0.11.1 does not limit the amount… CVSS 3.0HIGH 7.5
  • TI-2016-01956 The am_read_post_data function in mod_auth_mellon before 0.11.1 does not check if the… CVSS 3.0HIGH 7.5
  • TI-2014-07038 The mod_auth_mellon module before 0.8.1 allows remote attackers to obtain sensitive… CVSS 2.0MEDIUM 6.4
  • TI-2017-04558 mod_auth_mellon before 0.13.1 is vulnerable to a Cross-Site Session Transfer attack… CVSS 3.0MEDIUM 6.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences