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CVE-2020-13933 Apache Shiro

Affected softwareApache Shiro
Severity7.5 High CVSS 3.1 2 scores
Fixed in1.6.0
WeaknessImproper authentication (CWE-287)
Published17 Aug 2020
Updated17 Jun 2026

Description

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

Exploitation status

Proof of concept only

A proof of concept exists, but no reviewed exploit catalogue lists this CVE.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment no assessment published
  • Indexed PoC 3 indexed Published artifacts you can open, in GitHub PoC; first seen 2020-09-09.
  • EPSS 44% chance in 30 days A model's forecast, not a report of exploitation. Higher than 99% of all scored CVEs.

2 of these are GitHub repositories with fewer than 5 stars. They are listed for reference and don't count toward the exploitation status above.

IndexArtifactStarsFirst seen
GitHub PoC CVE-2020-13933 靶场: shiro 认证绕过漏洞 14 2020-09-09
GitHub PoC cve-2020-13933 apache shiro权限绕过漏洞 2 2020-09-23
GitHub PoC 此项目为复现CVE-2020-13933 shiro漏洞所搭建的简易springboot+shiro项目 1 2021-10-19

Waratek protection

Mitigation candidate

A kind of vulnerability Waratek's rules address, with exploit code published or exploitation reported. No rule exists and none is planned yet. The decision below says what we found to build a rule from.

  • Protection none
  • Action unverified
  • Review automated Inferred
  • Record active
Decided by The affected package being open source on Maven, so the fix can be read
Finding This CVE affects an open-source Java library published on Maven Central (Maven packages: org.apache.shiro:shiro-core), so it is squarely in ARMR's territory and the source needed to understand the defect is public. That makes it a candidate for an ARMR patch rule. No rule exists and none is scheduled: the diff between the affected and fixed versions has not been read, and a closer look may find no hook point ARMR can act on.

CVSS

7.5 HIGH v3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N NVD Primary published
CVSS 2.0 5.0 none AV:N/AC:L/Au:N/C:P/I:N/A:N NVD Primary

Affected software and releases

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.apache.shiro:shiro-core 0 1.6.0 unbounded

Products and versions

3 products, 3 version entries
SourceVendorProductSchemeAffected versions
nvd apache shiro generic < 1.6.0
nvd debian debian linux generic 9.0
osv org.apache.shiro shiro-core generic < 1.6.0

References

URLTags
https://lists.debian.org/debian-lts-announce/2021/08/msg00002.html WEB
https://lists.apache.org/thread.html/re25b8317b00a50272a7252c4552cf1a81a97984cc2111ef7728e48e0@%3Cdev.shiro.apache.org%3E WEB
https://lists.apache.org/thread.html/rb5edf49cd1451475dbcf53826ba6ef1bb7872dd6493d6112eb0c2bad@%3Cdev.shiro.apache.org%3E WEB
https://lists.apache.org/thread.html/rb47d88af224e396ee34ffb88ee99fb6d04510de5722cf14b7137e6bc@%3Cdev.shiro.apache.org%3E WEB
https://lists.apache.org/thread.html/r9ea6d8560d6354d41433ad006069904f0ed083527aa348b5999261a7@%3Cdev.geode.apache.org%3E WEB
https://lists.apache.org/thread.html/r9d93dfb5df016b1a71a808486bc8f9fbafebbdbc8533625f91253f1d@%3Cdev.shiro.apache.org%3E WEB
https://lists.apache.org/thread.html/r852971e28f54cafa7d325bd7033115c67d613b112a2a1076817390ac@%3Cdev.shiro.apache.org%3E WEB
https://lists.apache.org/thread.html/r8097b81905f2a113ebdf925bcbc6d8c9d6863c807c9ee42e1e7c9293@%3Cdev.shiro.apache.org%3E WEB
https://lists.apache.org/thread.html/r70b907ccb306e9391145e2b10f56cc6914a245f91720a17a486c020a@%3Cdev.shiro.apache.org%3E WEB
https://lists.apache.org/thread.html/r70098e336d02047ce4d4e69293fe8d558cd68cde06f6430398959bc4@%3Cdev.shiro.apache.org%3E WEB

Timeline

Published2020-08-17By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.