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Vulnerability record · public intelligence
CVE-2021-40110
UNKNOWN

Denial of Service in Apache James

Published Jan 4, 2022 · Updated Nov 3, 2026

Severity · CVSSUNKNOWN · Not scored
Known exploitationNot listed
EPSS / likelihood2.95%
QFinch risk scoreNot available

Original summary

Normalized public record · Updated Nov 3, 2026

Denial of Service in Apache James

Publisher and source text is retained separately from QFinch interpretation.

QFinch assessment

In Apache James, using Jazzer fuzzer, we identified that an IMAP user can craft IMAP LIST commands to orchestrate a Denial Of Service using a vulnerable Regular expression. This affected Apache James prior to 3.6.1 We recommend upgrading to Apache James 3.6.1 or higher , which enforce the use of RE2J regular expression engine to execute regex in linear time without back-tracking.

Evidence: public source records

Affected products

Affected scope reported by the available public evidence
Affected package, product or rangeFix status
Consult the referenced vendor advisory for affected versions.Consult source advisory

Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.

Remediation

Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.

  1. Confirm the affected product and reachable code path exist in your environment.
  2. Apply the vendor-supported patch or mitigation from the primary advisory.
  3. Rescan the exact deployed revision and retain verification evidence.
Review primary references

Evidence coverage

FIRST-EPSSCVE-LIST-V5
SSVC priority
MEDIUM
Confidence
Not available
Aliases
None reported

Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.

Sources and record history

  1. www.openwall.com ↗
  2. [oss-security] 20220104 CVE-2021-40110: Apache James IMAP vulnerable to a ReDoS ↗

Record history

Published Jan 4, 2022 · Last refreshed Nov 3, 2026

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