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Fencer Intel
critical 9.8

CVE-2020-17523 in the critical feed json

Authentication bypass in Apache Shiro

published 5y ago modified 4mo ago also GHSA-v98j-7crc-wvrj , EUVD-2022-1197

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
85.9%
EPSS 85.9% chance of exploitation in 30 days, percentile 99.7%
public exploits
0
none known

Summary

Apache Shiro before 1.7.1, when using Apache Shiro with Spring, a specially crafted HTTP request may cause an authentication bypass.

Patch / fix

  • maven org.apache.shiro:shiro-web 1.7.1
  • maven org.apache.shiro:shiro-spring 1.7.1
  • maven org.apache.shiro:shiro-spring-boot-starter 1.7.1
  • apache shiro 1.7.1

Is CVE-2020-17523 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-2020-17523 updated cvss 9.8

shiro: Authentication bypass through specially crafted HTTP request

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

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

85.91% chance of exploitation in the next 30 days, higher than 99.7% of all scored CVEs (FIRST EPSS, 2026-11-09).

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 9.0 AV:N/AC:L/Au:N/C:P/I:P/A:C
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-web
<1.7.1
1.7.1
maven org.apache.shiro:shiro-spring
<1.7.1
1.7.1
maven org.apache.shiro:shiro-spring-boot-starter
<1.7.1
1.7.1

Affected products

  • n/a Apache Shiro

Classification

Weakness

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.