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Fencer Intel
medium 6.1

CVE-2020-28724 json

Open Redirect in werkzeug

published 5y ago modified 4mo ago also GHSA-3p3h-qghp-hvh2 , PYSEC-2020-157 , EUVD-2020-0241

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.7%
EPSS 1.7% chance of exploitation in 30 days, percentile 77%
public exploits
0
none known

Summary

Open redirect vulnerability in werkzeug before 0.11.6 via a double slash in the URL.

Patch / fix

  • pypi werkzeug 0.11.6
  • palletsprojects werkzeug 0.11.6
  • python-werkzeug Debian 14, Debian 13, Debian 12 0.11.9+dfsg1-1

debian advisories DEBIAN-CVE-2020-28724

  • python-werkzeug Ubuntu 16.04 LTS 0.10.4+dfsg1-1ubuntu1.2

ubuntu advisories UBUNTU-CVE-2020-28724

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2020-28724 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-28724 updated cvss 5.4

python-werkzeug: open redirect via double slash in the URL

  • Red Hat Ceph Storage 2 python-werkzeug
    affected: no fix planned “Out of support scope”
  • Red Hat Satellite 6 python-werkzeug, python2-werkzeug
    affected: no fix planned “Will not fix”
  • Red Hat Update Infrastructure 3 for Cloud Providers python-werkzeug
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 python3-werkzeug Red Hat OpenShift Container Platform 4 python-werkzeug, python3-werkzeug Red Hat OpenStack Platform 16.1 python-werkzeug, python3-werkzeug Red Hat Quay 3 python-werkzeug Red Hat Software Collections python27-python-werkzeug Red Hat Virtualization 4 python-werkzeug, python3-werkzeug
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.68% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/pallets/flask/issues/1639 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 5.8 AV:N/AC:M/Au:N/C:P/I:P/A:N
GitHub 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
pypi werkzeug
<0.11.6
0.11.6

Classification

Weakness
  • CWE-601 URL Redirection to Untrusted Site

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.