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Fencer Vulns
high 7.5

CVE-2020-13933 in the critical feed json

Authentication bypass in Apache Shiro

published 2020-08-17 6 y ago modified 2026-06-17 4 mo ago also GHSA-2vgm-wxr3-6w2j , EUVD-2021-0908

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
44.4%
EPSS 44.4% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known

Summary

Apache Shiro before 1.6.0, when using Apache Shiro, a specially crafted HTTP request may cause an authentication bypass.

Patch / fix

  • maven org.apache.shiro:shiro-core 1.6.0
  • apache shiro 1.6.0
  • shiro Debian 14, Debian 13, Debian 12 1.3.2-5

debian advisories DEBIAN-CVE-2020-13933

  • shiro Ubuntu 20.04 LTS 1.3.2-4ubuntu0.2
  • shiro Ubuntu 22.04 LTS 1.3.2-5
  • shiro Ubuntu Pro 18.04 LTS 1.3.2-3ubuntu0.18.04.1~esm1

ubuntu advisories UBUNTU-CVE-2020-13933

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

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-2020-13933 updated cvss 7.5

shiro: specially crafted HTTP request may cause an authentication bypass

  • Red Hat JBoss Fuse 6 shiro-core shiro-core
    affected: workaround, no fix planned “There is currently no known mitigation for this issue.”
  • Red Hat Fuse 7.8.0
    fixed: vendor fix “There is currently no known mitigation for this issue.” RHSA-2020:5568
  • Red Hat Fuse/AMQ 6.3.18
    fixed: vendor fix “There is currently no known mitigation for this issue.” RHSA-2021:0384
  • Red Hat Integration Camel K 1 camel-shiro camel-shiro Red Hat JBoss Fuse Service Works 6 shiro-core shiro-core Red Hat OpenStack Platform 10 (Newton) opendaylight Red Hat OpenStack Platform 13 (Queens) opendaylight
    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

44.41% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
maven org.apache.shiro:shiro-core
<1.6.0
1.6.0

Affected products

  • n/a Apache Shiro

Classification

Weakness

References

Sources

Fencer Vulns 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.