What’s Vulnerable › Vulnerabilities

CVE-2020-12415

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-07-09 · updated 2026-06-17
• Weakness: CWE-276

Description

When "%2F" was present in a manifest URL, Firefox's AppCache behavior may have become confused and allowed a manifest to be served from a subdirectory. This could cause the appcache to be used to service requests for the top level directory. This vulnerability affects Firefox < 78.

Affected products

• Mozilla Firefox: before 78.0 — fixed in 78.0
• openSUSE Leap: 15.1, 15.2

How to fix

Upgrade to a fixed version: Mozilla Firefox 78.0. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00027.html
• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00049.html
• https://bugzilla.mozilla.org/show_bug.cgi?id=1586630
• https://security.gentoo.org/glsa/202007-10
• https://www.mozilla.org/security/advisories/mfsa2020-24/
• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00027.html
• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00049.html
• https://bugzilla.mozilla.org/show_bug.cgi?id=1586630
• https://security.gentoo.org/glsa/202007-10
• https://www.mozilla.org/security/advisories/mfsa2020-24/

Get alerted when CVE-2020-12415 or the next vulnerability affects your stack