CVE-2021-43528: debian debian_linux Improper Privilege Management
CVSS: 6.5v3.1MediumModified
AliasesUBUNTU-CVE-2021-43528DEBIAN-CVE-2021-43528
Published 08-12-2021Last modified 04-08-2024
Vulnerability summary
CVE-2021-43528 is a medium (CVSS 6.5) Improper Privilege Management vulnerability in debian debian_linux. EPSS estimates a 1.31% chance of exploitation in the next 30 days, higher than 70.1% of scored vulnerabilities.
CVSS score
6.5/10
010
Medium · v3.1 (NVD)EPSS score
1.31%
0%100%
Low · +0.04 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 13 · Related 5Timeline
- 08-12-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
Thunderbird unexpectedly enabled JavaScript in the composition area. The JavaScript execution context was limited to this area and did not receive chrome-level privileges, but could be used as a stepping stone to further an attack with other vulnerabilities. This vulnerability affects Thunderbird < 91.4.0.
CVSS metrics
4 scores · 3 sources · 2 versionsMedium 6.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:NSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
- OSV · DebianEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Medium 4.3Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:N/I:P/A:NSourcesSingle source
EPSS trend
Probability
1.31%
Chance of exploitation in the next 30 days
Percentile
70%
Versus all other CVEs
30-day change
+0.04 pp
From 1.27% on 19-09-2026
19-09-202619-10-2026
EPSS score1.31%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian2 products
- thunderbird< 1:91.4.0-1
- debian_linuxEOL9.0 | 10.0 | 11.0
Mozilla1 product
- thunderbird≥ unspecified, < 91.4.0 | < 91.4.0
Ubuntu1 product
- thunderbird< 1:91.5.0+build1-0ubuntu0.18.04.1 | < 1:91.5.0+build1-0ubuntu0.20.04.1
3 vendors · 4 products
References
11 links- bugzilla.mozilla.org/show_bug.cgi?id=1742579X Refsource MISCBroken LinkIssue TrackingPermissions RequiredVendor Advisory
www.debian.org/security/2022/dsa-5034Vendor AdvisoryX Refsource DEBIANIssue TrackingThird Party Advisory- lists.debian.org/debian-lts-announce/2022/01/msg00001.htmlMailing ListX Refsource MLISTThird Party Advisory