CVE-2020-15656

Name	CVE-2020-15656
Description	JIT optimizations involving the Javascript arguments object could confuse later optimizations. This risk was already mitigated by various precautions in the code, resulting in this bug rated at only moderate severity. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severity	high

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
firefox (PTS)	sid	86.0-1	fixed
thunderbird (PTS)	stretch	1:68.10.0-1~deb9u1	fixed
	stretch (security)	1:78.8.0-1~deb9u1	fixed
	buster	1:78.6.0-1~deb10u1	fixed
	buster (security)	1:78.8.0-1~deb10u1	fixed
	bullseye, sid	1:78.8.0-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
firefox	source	(unstable)	79.0-1
thunderbird	source	(unstable)	(not affected)

Notes

- thunderbird <not-affected> (Only affects Thunderbird 78.x)
https://www.mozilla.org/en-US/security/advisories/mfsa2020-32/#CVE-2020-15656
https://www.mozilla.org/en-US/security/advisories/mfsa2020-33/#CVE-2020-15656