CVE-2020-13933

mediumpriority · attend · 56EPSS 0.444 · 99 %ileexploit · PoCEURUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

3 exploits · PoC

Likely / severe?

44.4% (99th) EPSS

CVSS 5 · medium

Is it mine?

10 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

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

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · FSTEC (BDU) RU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · OSV

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Hsecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-287USCWE-287US

exploits (3)

Public proof-of-concept and weaponised exploit code.

0xkami/cve-2020-13933cve-2020-13933 apache shiro权限绕过漏洞PoC · poc_in_github
EXP-Docs/CVE-2020-13933CVE-2020-13933 靶场： shiro 认证绕过漏洞PoC · poc_in_github
KingBangQ/CVE-2020-13933Project此项目为复现CVE-2020-13933 shiro漏洞所搭建的简易springboot+shiro项目PoC · poc_in_github

affected products (10)

Products and version ranges known to be affected.

n/a Apache Shiro≤ Apache Shiro before version 1.6.0enisa_euvdEU
Apache Software Foundation Shiro≤ 1.6.0fstec_bduRU
Canonical Ltd. Ubuntu≤ 18.04 ESMfstec_bduRU
Canonical Ltd. Ubuntu≤ 20.04 LTSfstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 10fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 11fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 9fstec_bduRU
apache shiro< 1.6.0nvdUScpe:2.3:a:apache:shiro:*:*:*:*:*:*:*:*
debian debian linux= 9.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
Maven org.apache.shiro:shiro-core< 1.6.0osvUSpkg:maven/org.apache.shiro/shiro-core

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-2vgm-wxr3-6w2jAuthentication bypass in Apache Shiro2021-05-07ghsa · osvUS
Apache Shiro before 1.6.0, when using Apache Shiro, a specially crafted HTTP request may cause an authentication bypass.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd osv NVD CVE.org MITRE

published 2020-08-17modified 2026-06-17

references (58)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan