How severe is CVE-2020-1957?

CVE-2020-1957 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-1957 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 24% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-1957?

CVE-2020-1957 primarily affects Apache Shiro. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-1957?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2020-1957 published?

CVE-2020-1957 was published on 2020-03-25 and last updated on 2026-06-17.

CVE-2020-1957

CVE-2020-1957 is a critical-severity vulnerability in Apache Shiro with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 24% places it in the 98th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 24% (98th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Apache Shiro
Published: 2020-03-25
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2020-1957?: Apache Shiro before 1.5.2, when using Apache Shiro with Spring dynamic controllers, a specially crafted request may cause an authentication bypass.
How severe is CVE-2020-1957?: CVE-2020-1957 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-1957 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 24% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-1957?: CVE-2020-1957 primarily affects Apache Shiro. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-1957?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-1957 published?: CVE-2020-1957 was published on 2020-03-25 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:apache:shiro:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

More vulnerabilities in Apache Shiro

CVE-2023-34478 — Critical (CVSS 9.8): Apache Shiro, before 1.12.0 or 2.0.0-alpha-3, may be susceptible to a path traversal attack that results in an…
CVE-2022-40664 — Critical (CVSS 9.8): Apache Shiro before 1.10.0, Authentication Bypass Vulnerability in Shiro when forwarding or including via…
CVE-2022-32532 — Critical (CVSS 9.8): Apache Shiro before 1.9.1, A RegexRequestMatcher can be misconfigured to be bypassed on some servlet containers.…
CVE-2021-41303 — Critical (CVSS 9.8): Apache Shiro before 1.8.0, when using Apache Shiro with Spring Boot, a specially crafted HTTP request may cause an…
CVE-2020-17523 — Critical (CVSS 9.8): Apache Shiro before 1.7.1, when using Apache Shiro with Spring, a specially crafted HTTP request may cause an…
CVE-2020-17510 — Critical (CVSS 9.8): Apache Shiro before 1.7.0, when using Apache Shiro with Spring, a specially crafted HTTP request may cause an…

All CVEs affecting Apache Shiro →