CVE-2021-38496: debian debian_linux Use After Free
CVSS: 8.8v3.1HighModified
AliasesUBUNTU-CVE-2021-38496DEBIAN-CVE-2021-38496
Published 03-11-2021Last modified 04-08-2024
Vulnerability summary
CVE-2021-38496 is a high (CVSS 8.8) Use After Free vulnerability in debian debian_linux. EPSS estimates a 1.66% chance of exploitation in the next 30 days, higher than 76.2% of scored vulnerabilities.
CVSS score
8.8/10
010
High · v3.1 (NVD)EPSS score
1.66%
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 29 · Related 15DLA-2782-1DLA-2874-1DSA-4981-1DSA-5034-1MGASA-2021-0469MGASA-2021-0478OPENSUSE-SU-2021:1367-1OPENSUSE-SU-2021:1635-1OPENSUSE-SU-2021:3331-1OPENSUSE-SU-2021:3451-1OPENSUSE-SU-2021:4150-1OPENSUSE-SU-2024:11570-1OPENSUSE-SU-2024:11571-1OPENSUSE-SU-2024:14572-1RHSA-2021:3755RHSA-2021:3756RHSA-2021:3757RHSA-2021:3791RHSA-2021:3838RHSA-2021:3839RHSA-2021:3840RHSA-2021:3841SUSE-SU-2021:14826-1SUSE-SU-2021:3331-1SUSE-SU-2021:3446-1SUSE-SU-2021:3451-1SUSE-SU-2021:4150-1USN-5107-1USN-5248-1
Timeline
- 03-11-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.15, Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93.
CVSS metrics
4 scores · 3 sources · 2 versionsHigh 8.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HSourcesAll 3 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
Medium 6.8Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
1.66%
Chance of exploitation in the next 30 days
Percentile
76%
Versus all other CVEs
30-day change
0.00 pp
From 1.66% on 19-09-2026
19-09-202619-10-2026
EPSS score1.66%
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< 93.0+build1-0ubuntu0.18.04.1 | < 93.0+build1-0ubuntu0.20.04.1
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- mozjs68All versions (No fix recorded)
- mozjs78All versions (No fix recorded)
Debian3 products
- firefox-esr< 91.2.0esr-1
- thunderbird< 1:91.2.1-1
- debian_linuxEOL9.0 | 10.0 | 11.0
Mozilla3 products
- firefox≥ unspecified, < 93 | < 93.0 | ≥ 91.0, < 91.2
- firefox_esr≥ unspecified, < 91.2 | ≥ unspecified, < 78.15 | < 78.15
- thunderbird≥ unspecified, < 78.15 | ≥ unspecified, < 91.2 | < 78.15 | ≥ 91.0, < 91.2
3 vendors · 12 products
References
15 links- bugzilla.mozilla.org/show_bug.cgi?id=1725335X Refsource MISCIssue 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