CVE-2020-6822

HIGH

8.8

CVSS Score

Published: April 24, 2020 at 03:54 PM UTC

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

3 products affected across 1 vendorFirefoxThunderbirdFirefox ESR

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Severity

HIGH8.8

Exploit prediction

EPSS 1%

Description

On 32-bit builds, an out of bounds write could have occurred when processing an image larger than 4 GB in <code>GMPDecodeData</code>. It is possible that with enough effort this 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/show_bug.cgi?id=1544181

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

8.8HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-787

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