CVE-2020-15683: debian debian_linux Use After Free
CVSS: 9.8v3.1CriticalModified
AliasesUBUNTU-CVE-2020-15683DEBIAN-CVE-2020-15683
Published 22-10-2020Last modified 04-08-2024
Vulnerability summary
CVE-2020-15683 is a critical (CVSS 9.8) Use After Free vulnerability in debian debian_linux. EPSS estimates a 2.67% chance of exploitation in the next 30 days, higher than 85.5% of scored vulnerabilities.
CVSS score
9.8/10
010
Critical · v3.1 (NVD)EPSS score
2.67%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 31 · Related 14DLA-2411-1DLA-2416-1DSA-4778-1DSA-4780-1MGASA-2020-0395MGASA-2020-0396OPENSUSE-SU-2020:1732-1OPENSUSE-SU-2020:1748-1OPENSUSE-SU-2020:1780-1OPENSUSE-SU-2020:1785-1OPENSUSE-SU-2024:10600-1OPENSUSE-SU-2024:10601-1OPENSUSE-SU-2024:14572-1RHSA-2020:4310RHSA-2020:4311RHSA-2020:4315RHSA-2020:4317RHSA-2020:4330RHSA-2020:4909RHSA-2020:4913RHSA-2020:4944RHSA-2020:4945RHSA-2020:4947RHSA-2020:4948SUSE-SU-2020:14522-1SUSE-SU-2020:3021-1SUSE-SU-2020:3022-1SUSE-SU-2020:3053-1SUSE-SU-2020:3091-1USN-4599-1USN-4599-2
Timeline
- 22-10-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 3 sources · 2 versionsCritical 9.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
High 7.5Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
2.67%
Chance of exploitation in the next 30 days
Percentile
86%
Versus all other CVEs
30-day change
0.00 pp
From 2.67% on 20-09-2026
20-09-202620-10-2026
EPSS score2.67%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-416Use After FreeThe product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
- CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.
Affected systems
Ubuntu5 products
- firefox< 82.0+build2-0ubuntu0.16.04.5 | < 82.0+build2-0ubuntu0.18.04.1 | < 82.0+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< 78.4.0esr-1
- thunderbird< 1:78.4.0-1
- debian_linuxEOL9.0 | 10.0
Mozilla3 products
- firefox≥ unspecified, < 82 | < 82.0
- firefox_esr≥ unspecified, < 78.4 | < 78.4
- thunderbird≥ unspecified, < 78.4 | < 78.4
Opensuse1 product
- leapEOL15.1 | 15.2
4 vendors · 12 products
References
19 links- bugzilla.mozilla.org/buglist.cgi?bug_id=1576843%2C1656987%2C1660954%2C1662760%2C1663439%2C1666140X Refsource MISCBroken LinkIssue TrackingVendor Advisory
- lists.opensuse.org/opensuse-security-announce/2020-10/msg00057.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-10/msg00062.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
- lists.debian.org/debian-lts-announce/2020/10/msg00027.htmlMailing ListX Refsource MLISTThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-10/msg00074.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
Show all 19 references
- lists.opensuse.org/opensuse-security-announce/2020-10/msg00077.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory