CVE-2020-17523: apache shiro Improper Authentication
CVSS: 9.8v3.1CriticalModified
AliasesGHSA-v98j-7crc-wvrj
Published 03-02-2021Last modified 04-08-2024
Vulnerability summary
CVE-2020-17523 is a critical (CVSS 9.8) Improper Authentication vulnerability in apache shiro. EPSS estimates a 85.91% chance of exploitation in the next 30 days, higher than 99.7% of scored vulnerabilities.
CVSS score
9.8/10
010
Critical · v3.1 (NVD)EPSS score
85.91%
0%100%
Critical · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 0 · Related 1Timeline
- 03-02-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
Apache Shiro before 1.7.1, when using Apache Shiro with Spring, a specially crafted HTTP request may cause an authentication bypass.
CVSS metrics
3 scores · 2 sources · 2 versionsCritical 9.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesAll 2 agree
- OSV · MavenEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
High 9.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:P/A:CSourcesSingle source
EPSS trend
Probability
85.91%
Chance of exploitation in the next 30 days
Percentile
100%
Versus all other CVEs
30-day change
0.00 pp
From 85.91% on 18-09-2026
18-09-202618-10-2026
EPSS score85.91%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Org.apache.shiro3 products
- shiro-spring< 1.7.1
- shiro-spring-boot-starter< 1.7.1
- shiro-web< 1.7.1
Apache1 product
- shiro< 1.7.1
2 vendors · 4 products
