CVE-2020-15673: debian debian_linux Use After Free
Vulnerability summary
CVE-2020-15673 is a high (CVSS 8.8) Use After Free vulnerability in debian debian_linux. EPSS estimates a 1.96% chance of exploitation in the next 30 days, higher than 80% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 29 · Related 13Timeline
- 01-10-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
Mozilla developers reported memory safety bugs present in Firefox 80 and Firefox ESR 78.2. 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 < 81, Thunderbird < 78.3, and Firefox ESR < 78.3.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS trend
Probability
1.96%
Chance of exploitation in the next 30 days
Percentile
80%
Versus all other CVEs
30-day change
0.00 pp
From 1.96% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu5 products
- firefox< 81.0+build2-0ubuntu0.16.04.1 | < 81.0+build2-0ubuntu0.18.04.1 | < 81.0+build2-0ubuntu0.20.04.1
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- mozjs68All versions (No fix recorded)
- thunderbird< 1:78.8.1+build1-0ubuntu0.18.04.1 | < 1:78.7.1+build1-0ubuntu0.20.04.1
Debian3 products
- firefox-esr< 78.3.0esr-1
- thunderbird< 1:78.3.1-1
- debian_linuxEOL9.0 | 10.0
Mozilla3 products
- firefox≥ unspecified, < 81 | < 81.0
- firefox_esr≥ unspecified, < 78.3 | < 78.3
- thunderbird≥ unspecified, < 78.3 | < 78.3
Opensuse1 product
- leapEOL15.1 | 15.2
4 vendors · 12 products
References
16 links- bugzilla.mozilla.org/buglist.cgi?bug_id=1648493%2C1660800X Refsource MISCBroken LinkIssue TrackingVendor Advisory
- lists.debian.org/debian-lts-announce/2020/10/msg00020.htmlMailing ListX Refsource MLISTThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-10/msg00074.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-10/msg00077.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory