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MEDIUM severity

CVE-2021-41973 — mina-core

MEDIUM

CVE-2021-41973 is a medium-severity (CVSS 6.5) CWE-835 vulnerability in org.apache.mina:mina-core. A fix is available for org.apache.mina:mina-core — see the affected versions and patch details below.

Infinite loop in Apache MINA

Also known asGHSA-6mcm-j9cj-3vc3
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
4.6%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs92th percentile — riskier than 92% of all scored CVEsHighest risk
0.00%1.92%3.85%5.77%2.4%4.6%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected
☕org.apache.mina:mina-core☕org.apache.mina:mina-core

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

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.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.apache.mina:mina-core≥ 2.1.0&&< 2.1.52.1.5org.apache.mina:mina-core:2.1.5
☕Mavenorg.apache.mina:mina-coreall versions2.0.22org.apache.mina:mina-core:2.0.22

Affected Products

9 products · 14 configurations
Application
minaapache
≥ 2.1.0 && < 2.1.5
range
Application
banking paymentsoracle
1 version
14.5
Application
banking trade finance process managementoracle
1 version
14.5
Application
banking treasury managementoracle
1 version
14.5
Application
communications cloud native core consoleoracle
1 version
1.9.0
Application
customer management and segmentation foundationoracle
2 versions
18.019.0

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.mina:mina-core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.apache.mina:mina-core to 2.1.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-41973 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

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CVE-2021-41973: mina-core — Fixed in 2.1.5