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CVE-2021-41766

27
FAUCET Score

CVE-2021-41766 describes a deserialization vulnerability in Apache Karaf's JMX implementation, affecting all versions of the product. This flaw allows unauthenticated remote attackers to execute arbitrary code due to insecure handling of Java serialized objects, bypassing default JMX protections. With a CVSS score of 8.1 (High), the vulnerability presents a significant risk, enabling full compromise of confidentiality, integrity, and availability with low attack complexity. Despite its severity, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.3.6CPE matchmatch criteria
cpe:2.3:a:apache:karaf:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.1HIGH

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.03%
Probability of exploitation in next 30 days
EPSS Percentile
79.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0203 is in the 36th percentile among its peer group of 8,918 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 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 (2)

mavenpatch availablevia ghsa
Product: org.apache.karaf.management:org.apache.karaf.management.serverFixed in: 4.3.6
redhatpatch availablevia redhat_api
Product: Red Hat Fuse 7.11Fixed in: karaf
View patch

Vendor Advisories (2)

mavenGHSA-jh5g-9m4v-9vv9high

Insecure Java Deserialization in Apache Karaf

Jan 28, 2022
redhatCVE-2021-41766Important

karaf: insecure java deserialization

Jan 2, 2022

References

karaf.apache.org / security/cve-2021-41766.txt
Vendor Advisory