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Fencer Vulns
medium 6.5

CVE-2021-41973 json

Apache MINA HTTP listener DOS

published 2021-11-01 5 y ago modified 2026-06-17 4 mo ago also GHSA-6mcm-j9cj-3vc3 , EUVD-2021-2307

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.6%
EPSS 4.6% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven org.apache.mina:mina-core 2.0.22, 2.1.5
  • Apache Software Foundation Apache MINA 2.0.22, 2.1.5
  • mina2 Debian 14, Debian 13, Debian 12 2.1.5-1

debian advisories DEBIAN-CVE-2021-41973

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-41973 updated cvss 6.5

mina-core: infinite loop may lead to DoS

  • Red Hat BPM Suite 6 mina-core Red Hat JBoss A-MQ 6 mina-core Red Hat JBoss BRMS 5 mina-core Red Hat JBoss BRMS 6 mina-core Red Hat JBoss Data Virtualization 6 mina-core Red Hat JBoss Enterprise Application Platform 6 mina-core
    +3 more products
    Red Hat JBoss Fuse 6 mina-core Red Hat JBoss Fuse Service Works 6 mina-core Red Hat JBoss SOA Platform 5 mina-core
    affected: no fix planned “Out of support scope”
  • Red Hat Fuse 7 mina-core Red Hat Integration Camel K 1 mina-core Red Hat Integration Camel Quarkus 1 mina-core
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

4.63% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P
GitHub 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
maven org.apache.mina:mina-core
>=2.1.0, <2.1.5
<2.0.22
2.1.5
2.0.22

Affected products

  • Apache Software Foundation Apache MINA

Classification

Weakness
  • CWE-835 Loop with Unreachable Exit Condition

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.