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…

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.

Scores

EPSS (exploitation in 30 days)

1.3% · top 29% of all CVEs (6 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.

Weakness

• Out of bounds write in GMPDecodeData when processing large images
• CWE-787 (opens in a new tab)All about CWE-787 and its CVEs

Affected products

• Mozilla · Thunderbird

  • affected unspecified – < 68.7.0

• Mozilla · Firefox ESR

  • affected unspecified – < 68.7

• Mozilla · Firefox

  • affected unspecified – < 75

References (5)

• https://www.mozilla.org/security/advisories/mfsa2020-13/ (opens in a new tab)x_refsource_MISCx_transferred
• https://www.mozilla.org/security/advisories/mfsa2020-12/ (opens in a new tab)x_refsource_MISCx_transferred
• https://www.mozilla.org/security/advisories/mfsa2020-14/ (opens in a new tab)x_refsource_MISCx_transferred
• https://bugzilla.mozilla.org/show_bug.cgi?id=1544181 (opens in a new tab)x_refsource_MISCx_transferred
• USN-4335-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2020-6822](https://trackcve.app/badge/CVE-2020-6822.svg)](https://trackcve.app/cve/CVE-2020-6822)

Record last updated 4 Aug 2024, 09:11 UTC.