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CVE-2020-17523

71
FAUCET Score

CVE-2020-17523 describes an authentication bypass vulnerability in Apache Shiro, specifically when integrated with Spring. A specially crafted HTTP request can exploit this flaw, allowing unauthorized access. With a CVSS score of 9.8 (Critical), this vulnerability has a high impact on confidentiality, integrity, and availability, and can be exploited remotely with low attack complexity. Despite its critical severity and high EPSS score, there is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.7.1CPE matchmatch criteria
cpe:2.3:a:apache:shiro:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
85.91%
Probability of exploitation in next 30 days
EPSS Percentile
99.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.8591 is in the 99th percentile among its peer group of 36,833 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

mavenpatch availablevia ghsa
Product: org.apache.shiro:shiro-webFixed in: 1.7.1
mavenpatch availablevia ghsa
Product: org.apache.shiro:shiro-springFixed in: 1.7.1
mavenpatch availablevia ghsa
Product: org.apache.shiro:shiro-spring-boot-starterFixed in: 1.7.1
redhatend of lifevia redhat_api
Product: Red Hat Fuse 7Fixed in: shiro-core
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 13 (Queens)Fixed in: opendaylight

Vendor Advisories (2)

mavenGHSA-v98j-7crc-wvrjcritical

Authentication bypass in Apache Shiro

Feb 9, 2022
redhatCVE-2020-17523Important

shiro: Authentication bypass through specially crafted HTTP request

Jan 1, 2021

References

lists.apache.org / thread.html/r5b93ddf97e2c4cda779d22fab30539bdec454cfa5baec4ad0ffae235%40%3Cgitbox.activemq.apache.org%3E
lists.apache.org / thread.html/r679ca97813384bdb1a4c087810ba44d9ad9c7c11583979bb7481d196%40%3Cdev.shiro.apache.org%3E
lists.apache.org / thread.html/r8244fd0831db894d5e89911ded9c72196d395a90ae655414d23ed0dd%40%3Cusers.activemq.apache.org%3E
lists.apache.org / thread.html/r852971e28f54cafa7d325bd7033115c67d613b112a2a1076817390ac%40%3Cdev.shiro.apache.org%3E
lists.apache.org / thread.html/r9d93dfb5df016b1a71a808486bc8f9fbafebbdbc8533625f91253f1d%40%3Cdev.shiro.apache.org%3E
lists.apache.org / thread.html/rce5943430a6136d37a1f2fc201d245fe094e2727a0bc27e3b2d43a39%40%3Cdev.shiro.apache.org%3E
Mailing ListVendor Advisory
lists.apache.org / thread.html/rd4b613e121438b97e3eb263cac3137caddb1dbd8f648b73a4f1898a6%40%3Cissues.activemq.apache.org%3E
lists.apache.org / thread.html/re25b8317b00a50272a7252c4552cf1a81a97984cc2111ef7728e48e0%40%3Cdev.shiro.apache.org%3E