6.1

CVE-2021-3639: uninett mod_auth_mellon URL Redirection to Untrusted Site

Modified
AliasesSUSE-SU-2021:2912-1SUSE-SU-2022:1524-1RHSA-2022:1934
Published 22-08-2022Last modified 03-08-2024

Vulnerability summary

CVE-2021-3639 is a medium (CVSS 6.1) URL Redirection to Untrusted Site vulnerability in uninett mod_auth_mellon. EPSS estimates a 1.03% chance of exploitation in the next 30 days, higher than 63.7% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 6.1, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
6.1/10
010
Medium · v3.1 (NVD)
EPSS score
1.03%
0%100%
Low · +0.06 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1
DLA-3359-1

Timeline

  1. 22-08-2022
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 4 sources · 2 versions

EPSS trend

Probability

1.03%

Chance of exploitation in the next 30 days

Percentile

64%

Versus all other CVEs

30-day change

Increase +0.06 pp

From 0.97% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.

Suse13 products
  • apache2-mod_auth_mellon&distro=SUSE Enterprise Storage 7< 0.17.0-150200.5.7.1
  • apache2-mod_auth_mellon&distro=SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS< 0.17.0-150200.5.7.1
  • apache2-mod_auth_mellon&distro=SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS< 0.17.0-150200.5.7.1
  • apache2-mod_auth_mellon&distro=SUSE Linux Enterprise Module for Server Applications 15 SP3< 0.17.0-150200.5.7.1
  • apache2-mod_auth_mellon&distro=SUSE Linux Enterprise Real Time 15 SP2< 0.17.0-150200.5.7.1
Redhat5 products
  • mod_auth_mellon< 0:0.14.0-12.el8.1
  • mod_auth_mellon-debuginfo< 0:0.14.0-12.el8.1
  • mod_auth_mellon-debugsource< 0:0.14.0-12.el8.1
  • mod_auth_mellon-diagnostics< 0:0.14.0-12.el8.1
  • mod_auth_mellon-diagnostics-debuginfo< 0:0.14.0-12.el8.1
Opensuse3 products
  • apache2-mod_auth_mellon&distro=openSUSE Leap 15.3< 0.17.0-150200.5.7.1
  • apache2-mod_auth_mellon&distro=openSUSE Leap 15.4< 0.17.0-150200.5.7.1
  • apache2-mod_auth_mellon&distro=openSUSE Tumbleweed< 0.19.0-1.1
Debian1 product
  • libapache2-mod-auth-mellon< 0.18.0-1
Ubuntu1 product
  • libapache2-mod-auth-mellon< 0.13.1-1ubuntu0.3 | < 0.16.0-1ubuntu0.1 | All versions (No fix recorded) | < 0.17.0-1ubuntu1
Uninett1 product

6 vendors · 24 products

References

17 links
Show all 17 references