CVE-2020-15678

Name: CVE-2020-15678
Creator: NVD / NIST
Published: 2020-10-01T19:15:13.893+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.86%

Last modified Jun 17, 2026

CVE-2020-15678 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. When recursing through graphical layers while scrolling, an iterator may have become invalid, resulting in a potential use-after-free. This occurs because the function APZCTreeManager::ComputeClippedCompositionBounds did not follow iterator invalidation rules. EPSS estimates a 1.86% chance of exploitation in the next 30 days.

Description

When recursing through graphical layers while scrolling, an iterator may have become invalid, resulting in a potential use-after-free. This occurs because the function APZCTreeManager::ComputeClippedCompositionBounds did not follow iterator invalidation rules. This vulnerability affects Firefox < 81, Thunderbird < 78.3, and Firefox ESR < 78.3.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

1.86%

76.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 81.0
Mozilla	Firefox Esr	< 78.3
Mozilla	Thunderbird	< 78.3
Opensuse	Leap	15.1
Opensuse	Leap	15.2
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0

References

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00074.htmlBroken Link, Mailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00077.htmlBroken Link, Mailing List, Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1660211Issue Tracking, Permissions Required, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00020.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/202010-02Third Party Advisory
https://www.debian.org/security/2020/dsa-4770Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2020-42/Release Notes, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-43/Release Notes, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-44/Release Notes, Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00074.htmlBroken Link, Mailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00077.htmlBroken Link, Mailing List, Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1660211Issue Tracking, Permissions Required, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00020.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/202010-02Third Party Advisory
https://www.debian.org/security/2020/dsa-4770Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2020-42/Release Notes, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-43/Release Notes, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-44/Release Notes, Vendor Advisory

Timeline

Published: Oct 1, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-15678?

How severe is CVE-2020-15678?

CVE-2020-15678 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.86% probability of exploitation in the next 30 days.

How do I fix CVE-2020-15678?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-15678?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST