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CVE-2020-12421

MEDIUM
6.5
CVSS Score
Published: July 9, 2020 at 02:39 PM UTC
Updated: June 17, 2026 at 02:51 AM UTC
4 products affected across 2 vendorsUbuntu LinuxFirefoxThunderbird

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Severity
MEDIUM6.5
Exploit prediction
EPSS 2%

Description

When performing add-on updates, certificate chains terminating in non-built-in-roots were rejected (even if they were legitimately added by an administrator.) This could have caused add-ons to become out-of-date silently without notification to the user. This vulnerability affects Firefox ESR < 68.10, Firefox < 78, and Thunderbird < 68.10.0.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Ubuntu Linux· Canonicalrubygems
95%
16.0418.0419.1020.04
Firefox· Mozilla
95%
v < 78v < 78.0
Affected range stops below 78, so it looks safe — our inference, not a vendor statement
Affected range stops below 78.0, so it looks safe — our inference, not a vendor statement
Firefox ESR· Mozilla
95%
v < 68.10v < 68.10.0
Affected range stops below 68.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 68.10.0, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 68.10.0
Affected range stops below 68.10.0, so it looks safe — our inference, not a vendor statement

References (11)

Vendor Advisoryx_refsource_SUSEBroken Link
Source: [email protected]
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00023.html
Vendor Advisoryx_refsource_SUSEBroken Link
Source: [email protected]
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00026.html
Vendor Advisoryx_refsource_SUSEBroken Link
Source: [email protected]
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00027.html
Vendor Advisoryx_refsource_SUSEBroken Link
Source: [email protected]
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00049.html
x_refsource_MISCIssue TrackingVendor Advisory
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1308251
Vendor Advisoryx_refsource_GENTOOThird Party Advisory
Source: [email protected]
https://security.gentoo.org/glsa/202007-09
Vendor Advisoryx_refsource_GENTOOThird Party Advisory
Source: [email protected]
https://security.gentoo.org/glsa/202007-10
Vendor Advisoryx_refsource_UBUNTUThird Party Advisory
Source: [email protected]
https://usn.ubuntu.com/4421-1/

CVSS

6.5MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-295

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