CVE-2020-1957

Improper Authentication in Apache Shiro

9.8 CriticalFix available

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

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

23.3%Up 4.8 points since Apr 14, 2021

What each source reports

NVD Score used 9.8

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

Record: CVE-2020-1957
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Updated: 2026-11-02

CVE List No score

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

Record: CVE-2020-1957
Updated: 2026-11-02

EUVDEUVD-2021-0897 No score

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

Record: EUVD-2021-0897
Updated: 2026-11-03

GitHub AdvisoriesGHSA-26gr-cvq3-qxgf 9.8

Improper Authentication in Apache Shiro

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

Record: GHSA-26gr-cvq3-qxgf
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-287
Updated: 2026-11-02

OSV 9.8

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

Record: CVE-2020-1957
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2020-1957 9.8

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

Record: DEBIAN-CVE-2020-1957
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVGHSA-26gr-cvq3-qxgf 9.8

Improper Authentication in Apache Shiro

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

Record: GHSA-26gr-cvq3-qxgf
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-287
Updated: 2026-11-02

OSVUBUNTU-CVE-2020-1957 9.8

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

Record: UBUNTU-CVE-2020-1957
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVUSN-4740-1 No score

shiro vulnerabilities

It was discovered that Apache Shiro mishandled specially crafted requests. An attacker could use this vulnerability to bypass authentication mechanisms.

Record: USN-4740-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`org.apache.shiro:shiro-core` Maven	before 1.5.2	1.5.2
`shiro` Debian:12	before 1.3.2-5	1.3.2-5
`shiro` Debian:13	before 1.3.2-5	1.3.2-5
`shiro` Debian:14	before 1.3.2-5	1.3.2-5
`shiro` Debian:8	before 1.2.3-1+deb8u1, plus listed versions 1.2.3-1	1.2.3-1+deb8u1
`shiro` Debian:9	before 1.3.2-1+deb9u1, plus listed versions 1.3.2-1	1.3.2-1+deb9u1
`org.apache.shiro:shiro-core` Maven	before 1.5.2, plus listed versions 1.0.0-incubating1.1.01.2.01.2.11.2.2 Show 13 moreShow less 1.2.31.2.41.2.51.2.61.3.01.3.11.3.21.4.01.4.0-RC21.4.11.4.21.5.01.5.1	1.5.2
`shiro` Ubuntu:Pro:16.04:LTS	All versions, plus listed versions 1.2.4-11.2.4-1ubuntu0.1~esm11.2.4-1ubuntu0.1~esm2	None known
`shiro` Ubuntu:18.04:LTS	before 1.3.2-3~18.04.1, plus listed versions 1.3.2-21.3.2-3~18.04	1.3.2-3~18.04.1
`shiro` Ubuntu:20.04:LTS	before 1.3.2-4ubuntu0.1, plus listed versions 1.3.2-4	1.3.2-4ubuntu0.1

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, products	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-1957 is a critical vulnerability (CVSS 9.8) in Apache Shiro, published March 25, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 23.3%, the 97th percentile. Fixed in org.apache.shiro:shiro-core 1.5.2.

References

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