CVE-2020-15683
9.8
CRITICAL · CVSS 3.1 · EPSS 2.7% (pctl 85)
In your normal cycle
Critical by CVSS (9.8), but no sign of active exploitation.
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.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 2.67% — more likely to be exploited than 85% of all CVEs |
| Weakness | CWE-416 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2020-10-22 |
| Last modified | 2026-06-17 |
Affected (5)
| Vendor | Product |
|---|---|
| debian | debian linux |
| mozilla | firefox |
| mozilla | firefox esr |
| mozilla | thunderbird |
| opensuse | leap |
References
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00057.html
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00062.html
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00074.html
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00077.html
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1576843%2C1656987%2C1660954%2C1662760%2C1663439%2C1666140
- https://lists.debian.org/debian-lts-announce/2020/10/msg00027.html
- https://security.gentoo.org/glsa/202010-08
- https://www.debian.org/security/2020/dsa-4780
- https://www.mozilla.org/security/advisories/mfsa2020-45/
- https://www.mozilla.org/security/advisories/mfsa2020-46/
- https://www.mozilla.org/security/advisories/mfsa2020-47/
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00057.html
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00062.html
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00074.html
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00077.html
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1576843%2C1656987%2C1660954%2C1662760%2C1663439%2C1666140
- https://lists.debian.org/debian-lts-announce/2020/10/msg00027.html
- https://security.gentoo.org/glsa/202010-08
- https://www.debian.org/security/2020/dsa-4780
- https://www.mozilla.org/security/advisories/mfsa2020-45/
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