CVE-2020-6825

CRITICAL

9.8

CVSS Score

Published: April 24, 2020 at 03:50 PM UTC

Updated: June 17, 2026 at 03:23 AM UTC

3 products affected across 1 vendorFirefoxThunderbirdFirefox ESR

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Severity

CRITICAL9.8

Exploit prediction

EPSS 2%

Description

Mozilla developers and community members Tyson Smith and Christian Holler reported memory safety bugs present in Firefox 74 and Firefox ESR 68.6. 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 < 68.7.0, Firefox ESR < 68.7, and Firefox < 75.

Affected

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

Firefox · Mozilla

95%

v < 75

Affected range stops below 75, so it looks safe — our inference, not a vendor statement

Affected range stops below 75.0, so it looks safe — our inference, not a vendor statement

Firefox ESR · Mozilla

95%

v < 68.7

Affected range stops below 68.7, so it looks safe — our inference, not a vendor statement

Affected range stops below 68.7.0, so it looks safe — our inference, not a vendor statement

Thunderbird · Mozilla

95%

v < 68.7.0

Affected range stops below 68.7.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (5)

x_refsource_MISCIssue TrackingPermissions Required

Source: [email protected]

https://bugzilla.mozilla.org/buglist.cgi?bug_id=1572541%2C1620193%2C1620203

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/mfsa2020-12/

x_refsource_MISCVendor Advisory

Source: [email protected]

https://www.mozilla.org/security/advisories/mfsa2020-13/

x_refsource_MISCVendor Advisory

Source: [email protected]

https://www.mozilla.org/security/advisories/mfsa2020-14/

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

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