What’s Vulnerable › Vulnerabilities
CVE-2021-27290: Regular Expression Denial of Service (ReDoS)
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 4.7% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2021-03-12 · updated 2026-06-17
Description
ssri 5.2.2-8.0.0, fixed in 8.0.1, processes SRIs using a regular expression which is vulnerable to a denial of service. Malicious SRIs could take an extremely long time to process, leading to denial of service. This issue only affects consumers using the strict option.
Affected products
- Oracle Corporation GraalVM Enterprise Edition: 20.3.3, 21.2.0
- Siemens Sinec Infrastructure Network Services: before 1.0.1.1 — fixed in 1.0.1.1
- Ssri Project Ssri: from 5.2.2 before 6.0.2; from 7.0.0 before 8.0.1 — fixed in 6.0.2, 8.0.1
- Npm Ssri: from 5.2.2 before 6.0.2; from 7.0.0 before 7.1.1; from 8.0.0 before 8.0.1; 8.0.0 — fixed in 6.0.2, 7.1.1, 8.0.1
How to fix
Upgrade to a fixed version: Siemens Sinec Infrastructure Network Services 1.0.1.1; Ssri Project Ssri 6.0.2, 8.0.1; Npm Ssri 6.0.2, 7.1.1, 8.0.1. Check the vendor advisory for mitigations.
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
- https://doyensec.com/resources/Doyensec_Advisory_ssri_redos.pdf
- https://github.com/yetingli/SaveResults/blob/main/pdf/ssri-redos.pdf
- https://npmjs.com
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
- https://doyensec.com/resources/Doyensec_Advisory_ssri_redos.pdf
- https://github.com/yetingli/SaveResults/blob/main/pdf/ssri-redos.pdf
- https://npmjs.com
- https://www.oracle.com/security-alerts/cpuoct2021.html
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