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Fencer Vulns
critical 9.8

CVE-2020-1957 in the critical feed json

Improper Authentication in Apache Shiro

published 2020-03-25 6 y ago modified 2026-06-17 4 mo ago also GHSA-26gr-cvq3-qxgf , EUVD-2021-0897

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
23.3%
EPSS 23.3% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

Apache Shiro before 1.5.2, when using Apache Shiro with Spring dynamic controllers, a specially crafted request may cause an authentication bypass.

Patch / fix

  • maven org.apache.shiro:shiro-core 1.5.2
  • apache shiro 1.5.2
  • shiro Debian 14, Debian 13, Debian 12 1.3.2-5

debian advisories DEBIAN-CVE-2020-1957

  • shiro Ubuntu 18.04 LTS 1.3.2-3~18.04.1
  • shiro Ubuntu 20.04 LTS 1.3.2-4ubuntu0.1

ubuntu advisories UBUNTU-CVE-2020-1957

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-2020-1957 updated cvss 9.8

shiro: Spring dynamic controllers, a specially crafted request may cause an authentication bypass

  • Red Hat OpenStack Platform 10 (Newton) opendaylight Red Hat OpenStack Platform 13 (Queens) opendaylight
    affected: no fix planned “Will not fix”
  • Red Hat Fuse 7 shiro-core shiro-core Red Hat JBoss A-MQ 6 shiro-core shiro-core Red Hat JBoss Fuse 6 shiro-core shiro-core Red Hat JBoss Fuse Service Works 6 shiro-core shiro-core
    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

23.33% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
maven org.apache.shiro:shiro-core
<1.5.2
1.5.2

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.