CVE-2020-26959 — Use After Free in Mozilla Firefox

CWE-416 — Use After Free12 documents8 sources
Severity
8.8HIGHNVD
EPSS
0.5%
top 34.19%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Mozilla FirefoxMozilla Firefox ESRMozilla Thunderbird
Timeline
PublishedDec 9
Latest updateMay 24

Description

During browser shutdown, reference decrementing could have occured on a previously freed object, resulting in a use-after-free, memory corruption, and a potentially exploitable crash. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HExploitability: 2.8 | Impact: 5.9

Affected Packages7 packages

▶CVEListV5mozilla/firefox< 83
▶NVDmozilla/firefox< 83.0
▶CVEListV5mozilla/firefox_esr< 78.5
▶CVEListV5mozilla/thunderbird< 78.5

🔴Vulnerability Details

3
GHSA
GHSA-w4gq-6hmw-x862: During browser shutdown, reference decrementing could have occured on a previously freed object, resulting in a use-after-free, memory corruption, and↗2022-05-24
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OSV
CVE-2020-26959: During browser shutdown, reference decrementing could have occured on a previously freed object, resulting in a use-after-free, memory corruption, and↗2020-12-09
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CVEList
CVE-2020-26959: During browser shutdown, reference decrementing could have occured on a previously freed object, resulting in a use-after-free, memory corruption, and↗2020-12-09
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📋Vendor Advisories

8
Ubuntu
Thunderbird vulnerabilities↗2020-11-25
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Ubuntu
Firefox vulnerabilities↗2020-11-19
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Ubuntu
Firefox vulnerabilities↗2020-11-18
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Red Hat
Mozilla: Use-after-free in WebRequestService↗2020-11-17
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Debian
CVE-2020-26959: firefox - During browser shutdown, reference decrementing could have occured on a previous...↗2020
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CVE-2020-26959 — Use After Free in Mozilla Firefox | cvebase