What’s Vulnerable › Vulnerabilities

CVE-2020-15670

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-10-01 · updated 2026-08-19
• Weakness: CWE-362

Description

Mozilla developers reported memory safety bugs present in Firefox for Android 79. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 80, Firefox ESR < 78.2, Thunderbird < 78.2, and Firefox for Android < 80.

Affected products

• Mozilla Firefox: before 80.0 — fixed in 80.0
• Mozilla Firefox ESR: before 78.2 — fixed in 78.2
• Mozilla Firefox for Android: before 80.0 — fixed in 80.0
• Mozilla Thunderbird: before 78.2 — fixed in 78.2

How to fix

Upgrade to a fixed version: Mozilla Firefox 80.0; Mozilla Firefox ESR 78.2; Mozilla Firefox for Android 80.0; Mozilla Thunderbird 78.2. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1651001%2C1653626%2C1656957
• https://www.mozilla.org/security/advisories/mfsa2020-36/
• https://www.mozilla.org/security/advisories/mfsa2020-38/
• https://www.mozilla.org/security/advisories/mfsa2020-39/
• https://www.mozilla.org/security/advisories/mfsa2020-41/
• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1651001%2C1653626%2C1656957
• https://www.mozilla.org/security/advisories/mfsa2020-36/
• https://www.mozilla.org/security/advisories/mfsa2020-38/
• https://www.mozilla.org/security/advisories/mfsa2020-39/
• https://www.mozilla.org/security/advisories/mfsa2020-41/

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