What’s Vulnerable › Vulnerabilities

CVE-2021-29978

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-08-05 · updated 2026-06-17

Description

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.

Affected products

• Mozilla VPN: from 2.0 before 2.3 — fixed in 2.3

How to fix

Upgrade to a fixed version: Mozilla VPN 2.3. Check the vendor advisory for mitigations.

References

• https://github.com/mozilla-mobile/mozilla-vpn-client/issues/797
• https://github.com/mozilla-mobile/mozilla-vpn-client/issues/798
• https://github.com/mozilla-mobile/mozilla-vpn-client/issues/799
• https://github.com/mozilla-mobile/mozilla-vpn-client/issues/800
• https://github.com/mozilla-mobile/mozilla-vpn-client/issues/801
• https://github.com/mozilla-mobile/mozilla-vpn-client/issues/803
• https://github.com/mozilla-mobile/mozilla-vpn-client/issues/804
• https://github.com/mozilla-mobile/mozilla-vpn-client/issues/805
• https://github.com/mozilla-mobile/mozilla-vpn-client/issues/806
• https://github.com/mozilla-mobile/mozilla-vpn-client/issues/808
• https://github.com/mozilla-mobile/mozilla-vpn-client/issues/809
• https://github.com/mozilla-mobile/mozilla-vpn-client/issues/810

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