CVE-2021-29978

CVE-2021-29978 is a critical-severity vulnerability in Mozilla Mozilla Vpn with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

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.

Frequently asked questions

What is CVE-2021-29978?
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.
How severe is CVE-2021-29978?
CVE-2021-29978 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-29978 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-29978?
CVE-2021-29978 affects Mozilla Mozilla Vpn. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-29978?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-29978 published?
CVE-2021-29978 was published on 2021-08-05 and last updated on 2026-06-17.

References

Affected products (1)