Double Free The advisory has been revoked - it doesn't affect any version of package thunderbird (opens in a new tab)
Threat Intelligence
Snyk has reported that there have been attempts or successful attacks targeting this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU2004-THUNDERBIRD-583204
- published3 Apr 2020
- disclosed24 Apr 2020
Introduced: 3 Apr 2020
CVE-2020-6820 (opens in a new tab)Amendment
The Ubuntu security team deemed this advisory irrelevant for Ubuntu:20.04.
NVD Description
Note: Versions mentioned in the description apply only to the upstream thunderbird package and not the thunderbird package as distributed by Ubuntu.
Under certain conditions, when handling a ReadableStream, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 68.6.1.
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2020-6820
- https://security-tracker.debian.org/tracker/CVE-2020-6820
- https://www.mozilla.org/security/advisories/mfsa2020-11/
- https://www.mozilla.org/security/advisories/mfsa2020-14/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1626728
- https://usn.ubuntu.com/4335-1/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-6820
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog