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CVE Record

CVE-2021-33038: An issue was discovered in management/commands/hyperkitty_import.py in HyperKitty through 1.3.4.

An issue was discovered in management/commands/hyperkitty_import.py in HyperKitty through 1.3.4. When importing a private mailing list's archives, these archives are publicly visible for the duration of the import. For example, sensitive information might be available on the web for an hour during a large migration from Mailman 2 to Mailman 3.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

HyperKitty could briefly publish private mailing list archives while they were being imported. During a large Mailman 2 to Mailman 3 migration, confidential messages could become web-accessible until the import finished or protection was corrected.

Executive priority

Prioritize this where private mailing lists contain sensitive, regulated, or executive communications. It is not a broad internet worm risk, but it can create public disclosure during migration work and may require incident review if imports already occurred.

Technical view

CVE-2021-33038 affects HyperKitty through 1.3.4 in management/commands/hyperkitty_import.py. Private list archive imports could be exposed publicly for the duration of the import, creating a time-limited confidentiality failure rather than persistent remote code execution.

Likely exposure

Organizations running HyperKitty for Mailman 3 are most exposed during private archive migrations or re-imports, especially from Mailman 2. Exposure depends on importing private archives and whether public web access existed during that window.

Exploitation context

The provided sources do not show active exploitation, and the CVE is not CISA KEV-listed. The realistic risk is opportunistic or accidental discovery of private archive pages during an import window.

Researcher notes

Evidence is strongest for a temporary access-control failure during hyperkitty_import.py archive import. The bundle does not provide CVSS, CWE, affected package matrix, or active exploitation evidence, so validation should focus on deployment version, migration history, and web exposure during imports.

Mitigation direction

  • Apply vendor or distribution updates for HyperKitty beyond affected versions.
  • Review the upstream fix and Debian DSA-4922 guidance before importing private archives.
  • Restrict public access to HyperKitty during private archive migrations.
  • Avoid large private imports until the patched import behavior is confirmed.
  • Treat any exposed private archives as a potential data disclosure incident.

Validation and detection

  • Inventory HyperKitty deployments and confirm whether versions are through 1.3.4.
  • Check whether private Mailman archives were imported before patching.
  • Verify private archives require authentication during and after import workflows.
  • Review web access logs around migration windows for archive access.
  • Confirm vendor or distribution security updates are installed.
Prepared
Confidence
high
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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0CVSS vectors
0Timeline events
0ADP providers
5Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
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CWE details

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