CVE-2020-15683

CRITICAL
9.8
CVSS Score
Published: October 22, 2020 at 08:32 PM UTC
Updated: June 17, 2026 at 02:57 AM UTC
5 products affected across 3 vendorsDebian LinuxFirefoxThunderbird

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Severity
CRITICAL9.8
Exploit prediction
EPSS 3%

Description

Mozilla developers and community members reported memory safety bugs present in Firefox 81 and Firefox ESR 78.3. 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 Firefox ESR < 78.4, Firefox < 82, and Thunderbird < 78.4.

Affected

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

v < 82
Affected range stops below 82, so it looks safe — our inference, not a vendor statement
Affected range stops below 82.0, so it looks safe — our inference, not a vendor statement
v < 78.4
Affected range stops below 78.4, so it looks safe — our inference, not a vendor statement
v < 78.4
Affected range stops below 78.4, so it looks safe — our inference, not a vendor statement

References (11)

Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00057.html
Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00062.html
Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00074.html
Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00077.html
Mailing Listx_refsource_MLISTThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00027.html
Vendor Advisoryx_refsource_GENTOOThird Party Advisory
https://security.gentoo.org/glsa/202010-08
Vendor Advisoryx_refsource_DEBIANThird Party Advisory
https://www.debian.org/security/2020/dsa-4780

CVSS

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

Quick Info

StatusMODIFIED
CWE
CWE-416CWE-787

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