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CVE-2021-40110

26
FAUCET Score

CVE-2021-40110 is a Denial of Service vulnerability affecting Apache James versions prior to 3.6.1, where a malicious IMAP user can craft specific LIST commands to trigger a vulnerable regular expression. The vulnerability has a CVSS score of 7.5 (HIGH), indicating it can be exploited remotely with low attack complexity, resulting in high availability impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE. Organizations using Apache James are advised to upgrade to version 3.6.1 or higher to mitigate this risk.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.6.1CPE matchmatch criteria
cpe:2.3:a:apache:james:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.86%
Probability of exploitation in next 30 days
EPSS Percentile
85.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0286 is in the 74th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 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 (1)

mavenpatch availablevia ghsa
Product: org.apache.james:james-serverFixed in: 3.6.1

Vendor Advisories (1)

mavenGHSA-r58x-wjg8-63m9high

Denial of Service in Apache James

Jan 8, 2022

References

openwall.com / lists/oss-security/2022/01/04/2
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2022/01/04/2
Mailing ListThird Party Advisory