vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2020-6814

CRITICAL
9.8
CVSS Score
Published: March 25, 2020 at 09:11 PM UTC
Updated: June 17, 2026 at 03:23 AM UTC
4 products affected across 2 vendorsUbuntu LinuxFirefoxThunderbird

Using Thunderbird by Mozilla?

Get instant alerts when new vulnerabilities affect Thunderbird - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
CRITICAL9.8
Exploit prediction
EPSS 2%

Description

Mozilla developers reported memory safety bugs present in Firefox and Thunderbird 68.5. 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 Thunderbird < 68.6, Firefox < 74, Firefox < ESR68.6, and Firefox ESR < 68.6.

Affected

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

Ubuntu Linux· Canonicalrubygems
95%
16.0418.0419.10
Firefox· Mozilla
95%
v < 74v < 74.0v < ESR68.6
Affected range stops below 74, so it looks safe — our inference, not a vendor statement
Affected range stops below 74.0, so it looks safe — our inference, not a vendor statement
Affected range stops below ESR68.6, so it looks safe — our inference, not a vendor statement
Firefox ESR· Mozilla
95%
v < 68.6v < 68.6.0
Affected range stops below 68.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 68.6.0, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 68.6v < 68.6.0
Affected range stops below 68.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 68.6.0, so it looks safe — our inference, not a vendor statement

References (6)

x_refsource_MISCIssue TrackingVendor Advisory
Source: [email protected]
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1592078%2C1604847%2C1608256%2C1612636%2C1614339
Vendor Advisoryx_refsource_UBUNTUThird Party Advisory
Source: [email protected]
https://usn.ubuntu.com/4328-1/
Vendor Advisoryx_refsource_UBUNTUThird Party Advisory
Source: [email protected]
https://usn.ubuntu.com/4335-1/
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2020-08/
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2020-09/
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2020-10/

CVSS

9.8CRITICAL[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-787

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card