CVE-2018-20060: fedoraproject fedora
Vulnerability summary
CVE-2018-20060 is a critical (CVSS 9.8) vulnerability in fedoraproject fedora. EPSS estimates a 4.49% chance of exploitation in the next 30 days, higher than 91.4% of scored vulnerabilities.
Severe, CVSS 9.8 (NVD); no exploitation reported by the 5 checked sources; EPSS 4% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 21 · Related 12Timeline
- 11-12-2018PublishedVulnerability first disclosed.
- 27-12-2024Last modifiedVulnerability information updated.
Description
urllib3 before version 1.23 does not remove the Authorization HTTP header when following a cross-origin redirect (i.e., a redirect that differs in host, port, or scheme). This can allow for credentials in the Authorization header to be exposed to unintended hosts or transmitted in cleartext.
CVSS metrics
6 scores · 4 sources · 3 versions- OSV · PypiEcosystem advisory · calculated9.8CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
4.49%
Chance of exploitation in the next 30 days
Percentile
91%
Versus all other CVEs
30-day change
No change 0.00 pp
From 4.49% 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 causeNo weakness data has been published for this record.
Affected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Debian1 product
- python-urllib3< 1.24-1
Fedoraproject1 product
- fedoraEOL28 | 29 | 30
PyPI1 product
- urllib3< 1.23
Python1 product
- urllib3< 1.23
Ubuntu1 product
- python-urllib3All versions (No fix recorded) | < 1.13.1-2ubuntu0.16.04.3 | < 1.22-1ubuntu0.18.04.1
5 vendors · 5 products
References
32 links- github.com/urllib3/urllib3/blob/master/CHANGES.rstX Refsource MISCRelease NotesThird Party AdvisoryWEBREPORT
- bugzilla.redhat.com/show_bug.cgi?id=1649153X Refsource MISCIssue TrackingMitigationPatchThird Party AdvisoryWEBREPORT
- lists.opensuse.org/opensuse-security-announce/2019-09/msg00039.htmlVendor AdvisoryX Refsource SUSEWEB
Show all 32 references
- github.com/urllib3/urllib3PACKAGE