CVE-2020-26970: mozilla thunderbird Out-of-bounds Write
CVSS: 9.3v2.0HighModified
AliasesMGASA-2020-0450SUSE-SU-2020:3642-1RHSA-2020:5398RHSA-2020:5399RHSA-2020:5400UBUNTU-CVE-2020-26970DEBIAN-CVE-2020-26970DLA-2479-1DSA-4802-1
Published 09-12-2020Last modified 04-08-2024
Vulnerability summary
CVE-2020-26970 is a high (CVSS 9.3) Out-of-bounds Write vulnerability in mozilla thunderbird. EPSS estimates a 1.25% chance of exploitation in the next 30 days, higher than 68.9% of scored vulnerabilities.
CVSS score
9.3/10
010
High · v2.0 (NVD)EPSS score
1.25%
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 4 · Related 2Timeline
- 09-12-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
When reading SMTP server status codes, Thunderbird writes an integer value to a position on the stack that is intended to contain just one byte. Depending on processor architecture and stack layout, this leads to stack corruption that may be exploitable. This vulnerability affects Thunderbird < 78.5.1.
CVSS metrics
5 scores · 4 sources · 2 versionsHigh 8.8Preferred score · OSV · Red hat (Ecosystem advisory) · calculated from vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HSourcesAll 4 agree
- 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
- NVDNIST8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
High 9.3Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:C/I:C/A:CSourcesSingle source
EPSS trend
Probability
1.25%
Chance of exploitation in the next 30 days
Percentile
69%
Versus all other CVEs
30-day change
0.00 pp
From 1.25% on 19-09-2026
19-09-202619-10-2026
EPSS score1.25%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Mageia3 products
- rootcerts< 20201201.00-1.mga7
- thunderbird< 78.5.1-1.mga7
- thunderbird-l10n< 78.5.1-1.mga7
Redhat3 products
- thunderbird< 0:78.5.1-1.el8_3 | < 0:78.5.1-1.el8_2 | < 0:78.5.1-1.el7_9
- thunderbird-debuginfo< 0:78.5.1-1.el8_3 | < 0:78.5.1-1.el8_2 | < 0:78.5.1-1.el7_9
- thunderbird-debugsource< 0:78.5.1-1.el8_3 | < 0:78.5.1-1.el8_2
Debian1 product
- thunderbird< 1:78.5.1-1 | < 1:78.5.1-1~deb10u1 | < 1:78.5.1-1~deb9u1
Mozilla1 product
- thunderbird< 78.5.1
Suse1 product
- MozillaThunderbird&distro=SUSE Linux Enterprise Workstation Extension 15 SP1< 78.5.1-3.110.2
Ubuntu1 product
- thunderbird< 1:78.8.1+build1-0ubuntu0.18.04.1 | < 1:78.7.1+build1-0ubuntu0.20.04.1
6 vendors · 10 products
References
24 links- bugzilla.mozilla.org/show_bug.cgi?id=1677338X Refsource MISCREPORTIssue TrackingPermissions RequiredVendor Advisory
