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Vulnerability record · CVE-2021-41973 · published 1 November 2021

CVE-2021-41973: Apache mina vulnerability

Apache · Mina

In Apache MINA, a specifically crafted, malformed HTTP request may cause the HTTP Header decoder to loop indefinitely. The decoder assumed that the HTTP Header begins at the beginning of the buffer and loops if there is more data than expected. Please update MINA to 2.1.5 or greater.

6.5 CVSS 3.1 Medium EPSS 4.6% · top 8.6% CWE-835 · CWE-835
6.5CVSS 3.1 base score, v2 4.3
4.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
9Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

In Apache MINA, a specifically crafted, malformed HTTP request may cause the HTTP Header decoder to loop indefinitely. The decoder assumed that the HTTP Header begins at the beginning of the buffer and loops if there is more data than expected. Please update MINA to 2.1.5 or greater.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products

9 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2021/11/01/2 Mailing ListPatchThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/11/01/8 Mailing ListThird Party Advisory
https://lists.apache.org/thread.html/r0b907da9340d5ff4e6c1a4798ef4e79700a668657f27cca8a39e9250%40%3Cdev.mina.apache.org% Mailing ListPatchVendor Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html PatchThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/11/01/2 Mailing ListPatchThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/11/01/8 Mailing ListThird Party Advisory
https://lists.apache.org/thread.html/r0b907da9340d5ff4e6c1a4798ef4e79700a668657f27cca8a39e9250%40%3Cdev.mina.apache.org% Mailing ListPatchVendor Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html PatchThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-41973), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.