CVE-2019-3877: canonical ubuntu_linux URL Redirection to Untrusted Site
Vulnerability summary
CVE-2019-3877 is a medium (CVSS 6.1) URL Redirection to Untrusted Site vulnerability in canonical ubuntu_linux. EPSS estimates a 2.12% chance of exploitation in the next 30 days, higher than 81.8% of scored vulnerabilities.
Not severe (CVSS 5.8, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 4 · Related 2Timeline
- 27-03-2019PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
A vulnerability was found in mod_auth_mellon before v0.14.2. An open redirect in the logout URL allows requests with backslashes to pass through by assuming that it is a relative URL, while the browsers silently convert backslash characters into forward slashes treating them as an absolute URL. This mismatch allows an attacker to bypass the redirect URL validation logic in apr_uri_parse function.
CVSS metrics
6 scores · 5 sources · 2 versions- CVE.orgCNA5.8MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:NDiffers
- OSV · Red hatEcosystem advisory · calculated6.1MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- OSV · UbuntuEcosystem advisory · calculated5.8MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:NDiffers
- OSV · DebianEcosystem advisory · calculated6.1MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS trend
Probability
2.12%
Chance of exploitation in the next 30 days
Percentile
82%
Versus all other CVEs
30-day change
No change 0.00 pp
From 2.12% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Redhat6 products
- enterprise_linuxEOL7.0
- mod_auth_mellon< 0:0.14.0-9.el8
- mod_auth_mellon-debuginfo< 0:0.14.0-9.el8
- mod_auth_mellon-debugsource< 0:0.14.0-9.el8
- mod_auth_mellon-diagnostics< 0:0.14.0-9.el8
Canonical1 product
- ubuntu_linuxEOL18.04 | 18.10
Debian1 product
- libapache2-mod-auth-mellon< 0.14.2-1
Fedoraproject1 product
- fedoraEOL29
Mod_auth_mellon_project1 product
- mod_auth_mellon< 0.14.2
Ubuntu1 product
- libapache2-mod-auth-mellon< 0.12.0-2+deb9u1build0.16.04.1 | < 0.13.1-1ubuntu0.1 | < 0.14.2-1ubuntu1
Uninett1 product
- mod_auth_mellonv0.14.2
7 vendors · 12 products
References
21 links- bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3877X Refsource CONFIRMIssue TrackingPatchThird Party Advisory
- github.com/Uninett/mod_auth_mellon/commit/62041428a32de402e0be6ba45fe12df6a83bedb8X Refsource CONFIRMPatchThird Party Advisory
