CVE-2021-38506: debian debian_linux
CVSS: 4.3v3.1MediumModified
AliasesUBUNTU-CVE-2021-38506DEBIAN-CVE-2021-38506
Published 08-12-2021Last modified 04-08-2024
Vulnerability summary
CVE-2021-38506 is a medium (CVSS 4.3) vulnerability in debian debian_linux. EPSS estimates a 1.51% chance of exploitation in the next 30 days, higher than 74% of scored vulnerabilities.
CVSS score
4.3/10
010
Medium · v3.1 (NVD)EPSS score
1.51%
0%100%
Low · +0.05 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 26 · Related 12DLA-2863-1DLA-2874-1DSA-5026-1DSA-5034-1MGASA-2021-0505MGASA-2021-0506OPENSUSE-SU-2021:1635-1OPENSUSE-SU-2021:3745-1OPENSUSE-SU-2021:4150-1OPENSUSE-SU-2024:11607-1OPENSUSE-SU-2024:11614-1OPENSUSE-SU-2024:14572-1RHSA-2021:4116RHSA-2021:4123RHSA-2021:4130RHSA-2021:4132RHSA-2021:4133RHSA-2021:4134RHSA-2021:4605RHSA-2021:4607SUSE-SU-2021:3651-1SUSE-SU-2021:3721-1SUSE-SU-2021:3745-1SUSE-SU-2021:4150-1USN-5131-1USN-5248-1
Timeline
- 08-12-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
Through a series of navigations, Firefox could have entered fullscreen mode without notification or warning to the user. This could lead to spoofing attacks on the browser UI including phishing. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
CVSS metrics
4 scores · 3 sources · 2 versionsMedium 4.3Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:NSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated4.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
- OSV · DebianEcosystem advisory · calculated4.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Medium 4.3Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:N/I:P/A:NSourcesSingle source
EPSS trend
Probability
1.51%
Chance of exploitation in the next 30 days
Percentile
74%
Versus all other CVEs
30-day change
+0.05 pp
From 1.46% on 19-09-2026
19-09-202619-10-2026
EPSS score1.51%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu6 products
- firefox< 94.0+build3-0ubuntu0.18.04.1 | < 94.0+build3-0ubuntu0.20.04.1 | < 94.0+build3-0ubuntu1
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- mozjs68All versions (No fix recorded)
- mozjs78All versions (No fix recorded)
Debian3 products
- firefox-esr< 91.3.0esr-1
- thunderbird< 1:91.3.0-1
- debian_linuxEOL9.0 | 10.0 | 11.0
Mozilla3 products
- firefox≥ unspecified, < 94 | < 94.0
- firefox_esr≥ unspecified, < 91.3 | < 91.3.0
- thunderbird≥ unspecified, < 91.3 | < 91.3.0
3 vendors · 12 products
References
18 links- bugzilla.mozilla.org/show_bug.cgi?id=1730750X Refsource MISCIssue TrackingPermissions RequiredVendor Advisory
- lists.debian.org/debian-lts-announce/2021/12/msg00030.htmlMailing ListX Refsource MLISTThird Party Advisory
- lists.debian.org/debian-lts-announce/2022/01/msg00001.htmlMailing ListX Refsource MLISTThird Party Advisory