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CVE-2020-1957 Apache Shiro

Affected softwareApache Shiro
Severity9.8 Critical CVSS 3.1 2 scores
Fixed in1.5.2
WeaknessImproper authentication (CWE-287)
Published25 Mar 2020
Updated17 Jun 2026

Description

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

Exploitation status

Exploited

Real-world exploitation reported by VulnCheck KEV. CISA has not confirmed it.

  • CISA KEV not listed
  • VulnCheck KEV listed Exploitation reported in the wild. 1 citation · earliest 2021-04-12.
  • CISA Vulnrichment no assessment published
  • Indexed PoC none indexed
  • EPSS 23% chance in 30 days A model's forecast, not a report of exploitation. Higher than 98% of all scored CVEs.

VulnCheck KEV

Exploitation evidence from VulnCheck Known Exploited Vulnerabilities (VulnCheck KEV), used under VulnCheck's community terms. View CVE-2020-1957 in VulnCheck (free account).

EvidenceSourceDetailDate
Reported exploitation unit42.paloaltonetworks.com /network-attack-trends-winter-2020 2021-04-12

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

9.8 CRITICAL v3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H 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 9.8 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H NVD Primary published
CVSS 2.0 7.5 none AV:N/AC:L/Au:N/C:P/I:P/A:P NVD Primary

Affected software and releases

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.apache.shiro:shiro-core 0 1.5.2 unbounded

Products and versions

3 products, 3 version entries
SourceVendorProductSchemeAffected versions
nvd apache shiro generic < 1.5.2
nvd debian debian linux generic 8.0
osv org.apache.shiro shiro-core generic < 1.5.2

References

URLTags
https://github.com/apache/shiro PACKAGE
https://lists.apache.org/thread.html/r17f371fc89d34df2d0c8131473fbc68154290e1be238895648f5a1e6%40%3Cdev.shiro.apache.org%3E WEB
https://lists.apache.org/thread.html/r2d2612c034ab21a3a19d2132d47d3e4aa70105008dd58af62b653040@%3Ccommits.shiro.apache.org%3E WEB
https://lists.apache.org/thread.html/rab1972d6b177f7b5c3dde9cfb0a40f03bca75f0eaf1d8311e5762cb3@%3Ccommits.shiro.apache.org%3E WEB
https://lists.apache.org/thread.html/rb3982edf8bc8fcaa7a308e25a12d294fb4aac1f1e9d4e14fda639e77@%3Cdev.geode.apache.org%3E WEB
https://lists.apache.org/thread.html/rc64fb2336683feff3580c3c3a8b28e80525077621089641f2f386b63@%3Ccommits.camel.apache.org%3E WEB
https://lists.apache.org/thread.html/rc8b39ea8b3ef71ddc1cd74ffc866546182683c8adecf19c263fe7ac0@%3Ccommits.shiro.apache.org%3E WEB
https://lists.debian.org/debian-lts-announce/2020/04/msg00014.html WEB
https://lists.apache.org/thread.html/r2d2612c034ab21a3a19d2132d47d3e4aa70105008dd58af62b653040%40%3Ccommits.shiro.apache.org%3E
https://lists.apache.org/thread.html/rab1972d6b177f7b5c3dde9cfb0a40f03bca75f0eaf1d8311e5762cb3%40%3Ccommits.shiro.apache.org%3E

Timeline

Published2020-03-25By the CVE Program.
VulnCheck KEV: earliest evidence2021-04-12Date of the oldest evidence of exploitation in VulnCheck KEV's record. VulnCheck does not publish the date it listed the CVE.
NVD record modified2026-06-17NVD's own last-modified date for this record.