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NVD / CVE Program· CNA apache

CVE-2021-41973: Apache MINA HTTP listener DOS

Noroxi assessment

Priority: Monitor (action score 27/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 4.6% (FIRST EPSS); higher than 91.6% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: Apache Software Foundation Apache MINA 2.0.22.

Low priority for now. Upgrade to Apache Software Foundation Apache MINA 2.0.22 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 6.5 · v3.1—No exploit Fix available
Published
Nov 1, 2021
Updated
Jun 17, 2026
EPSS
4.6% · 91th percentile

Report tools

JSON

Action score

27

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 4.6%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
apachemina
oraclebanking payments
oraclebanking trade finance process management
oraclebanking treasury management
oraclecommunications cloud native core console
oraclecustomer management and segmentation foundation
oracleflexcube universal banking
oraclefusion middleware common libraries and tools
oracleoss support tools

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • apache minabefore 2.0.22
  • apache mina2.1.0 and later · before 2.1.5
  • oracle banking payments14.5
  • oracle banking trade finance process management14.5
  • oracle banking treasury management14.5
  • oracle communications cloud native core console1.9.0
  • oracle customer management and segmentation foundation18.0
  • oracle customer management and segmentation foundation19.0
  • oracle flexcube universal banking14.0 and later · up to 14.3 inclusive
  • oracle flexcube universal banking14.5
  • oracle fusion middleware common libraries and tools12.2.1.3.0
  • oracle fusion middleware common libraries and tools12.2.1.4.0
  • oracle fusion middleware common libraries and tools14.1.1.0.0
  • oracle oss support tools2.12.42

Versions reported by the vendor

Affected version ranges reported by the assigning authority (apache). Independent of NVD's CPE analysis and usually ahead of it.

  • Apache Software Foundation Apache MINA

    • Apache MINA and later · before 2.1.5affectedfixed in 2.0.22

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12mina2before 2.1.5-12.1.5-1
Mavenorg.apache.mina:mina-corefrom 2.1.0 · before 2.1.52.1.5
Mavenorg.apache.mina:mina-corebefore 2.0.222.0.22

Same product

apache: all records

Other highest-scoring records for the same primary product.

  • CVE-2024-52046Apache MINA: MINA applications using unbounded deserialization may allow RCE
    47Plan
  • CVE-2026-47065Apache MINA: Critical Deserialization Allow-list Bypass via resolveProxyClass - ZDRES-232
    39Monitor
  • CVE-2026-42779Apache MINA: AbstractIoBuffer.resolveClass() null-clazz Branch Skips acceptMatchers Filter — Full Object Deserialization RCE (take 2)
    39Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2019-0231Oct 1, 2019 · Apache MINA SSLFilter security Issue
    31Monitor
  • Later →CVE-2026-41635Apr 27, 2026 · Apache MINA: AbstractIoBuffer.resolveClass() null-clazz Branch Skips acceptMatchers Filter — Full Object Deserialization RCE
    39Monitor
  • Later →CVE-2026-41409Apr 27, 2026 · Apache MINA: CWE-502 Deserialization of Untrusted Data
    39Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Apache Software Foundation Apache MINA2.0.22Vendor (CNA)
debian:mina22.1.5-1 · Debian:12Package registry (OSV)
Maven:org.apache.mina:mina-core2.0.22Package registry (OSV)
Maven:org.apache.mina:mina-core2.1.5Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records