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CVE Record

CVE-2021-29978: Multiple low security issues were discovered and fixed in a security audit of Mozilla VPN 2.x branch as par...

Multiple low security issues were discovered and fixed in a security audit of Mozilla VPN 2.x branch as part of a 3rd party security audit. This vulnerability affects Mozilla VPN < 2.3.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

CVE-2021-29978 covers multiple low-severity security issues found during a third-party audit of Mozilla VPN. The affected range is Mozilla VPN before 2.3. The bundle does not describe a single critical failure, business-impact scenario, or confirmed exploitation.

Executive priority

Schedule remediation through normal endpoint patching. Escalate only if older Mozilla VPN clients are widely deployed, hard to inventory, or used by privileged staff handling sensitive access.

Technical view

The CVE is an aggregate finding for several low security issues in the Mozilla VPN 2.x branch. Mozilla says the issues were discovered and fixed through audit work. The provided data has no CVSS score, CWE mapping, or detailed impact breakdown.

Likely exposure

Exposure is limited to environments where Mozilla VPN clients earlier than version 2.3 are installed. Organizations with unmanaged endpoint software may have higher uncertainty because VPN clients can be user-installed outside standard server inventories.

Exploitation context

The source bundle does not show active exploitation, public weaponization, or CISA KEV listing. Treat this as a hygiene and endpoint currency issue unless Mozilla or another cited source provides stronger evidence.

Researcher notes

Evidence is sparse. The CVE aggregates multiple low issues and the provided bundle lacks CVSS, CWE, and detailed per-issue impact. Use the Mozilla advisory and linked GitHub issues for triage context, but avoid assuming exploitability beyond the stated affected range.

Mitigation direction

  • Upgrade Mozilla VPN to version 2.3 or later.
  • Check Mozilla’s advisory for the authoritative fixed-version guidance.
  • Inventory endpoints for Mozilla VPN installations below 2.3.
  • Prioritize managed laptops and BYOD devices using Mozilla VPN.
  • Monitor Mozilla VPN release notes for related follow-up fixes.

Validation and detection

  • Confirm installed Mozilla VPN versions across endpoint management tools.
  • Review software inventory for Mozilla VPN versions earlier than 2.3.
  • Verify users can no longer launch outdated Mozilla VPN builds.
  • Check vulnerability scanner findings against the Mozilla advisory.
  • Document any unsupported or unmanaged endpoints needing remediation.
Prepared
Confidence
medium
Sources
12

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

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2021-29978 mapping review

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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

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
16Source 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
MozillaMozilla VPNunspecifiedListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.