What’s Vulnerable › Vulnerabilities

CVE-2019-11756

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-01-08 · updated 2026-06-17
• Weakness: CWE-416

Description

Improper refcounting of soft token session objects could cause a use-after-free and crash (likely limited to a denial of service). This vulnerability affects Firefox < 71.

Affected products

• Mozilla Firefox: before 71.0 — fixed in 71.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 71.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1508776
• https://www.mozilla.org/security/advisories/mfsa2019-36/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1508776
• https://www.mozilla.org/security/advisories/mfsa2019-36/

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