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CVE-2021-41973

24
FAUCET Score

CVE-2021-41973 is a denial-of-service vulnerability in Apache MINA, also affecting Oracle products that incorporate MINA. A specially crafted, malformed HTTP request can cause the HTTP Header decoder to loop indefinitely, leading to resource exhaustion. With a CVSS score of 6.5 (Medium), this vulnerability can be exploited remotely with low attack complexity, resulting in high availability impact. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.0.22CPE matchmatch criteria
cpe:2.3:a:apache:mina:*:*:*:*:*:*:*:*
>= 2.1.0, < 2.1.5CPE matchmatch criteria
cpe:2.3:a:apache:mina:*:*:*:*:*:*:*:*
14.5CPE matchmatch criteria
cpe:2.3:a:oracle:banking_payments:14.5:*:*:*:*:*:*:*
14.5CPE matchmatch criteria
cpe:2.3:a:oracle:banking_trade_finance_process_management:14.5:*:*:*:*:*:*:*
14.5CPE matchmatch criteria
cpe:2.3:a:oracle:banking_treasury_management:14.5:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
4.33%
Probability of exploitation in next 30 days
EPSS Percentile
90.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0433 is in the 96th percentile among its peer group of 26,219 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

mavenpatch availablevia ghsa
Product: org.apache.mina:mina-coreFixed in: 2.1.5
mavenpatch availablevia ghsa
Product: org.apache.mina:mina-coreFixed in: 2.0.22
oraclepatch availablevia nvd_reference
View patch

Vendor Advisories (2)

mavenGHSA-6mcm-j9cj-3vc3medium

Infinite loop in Apache MINA

Nov 3, 2021
redhatCVE-2021-41973Moderate

mina-core: infinite loop may lead to DoS

Nov 1, 2021

References

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