CVE-2020-12405: canonical ubuntu_linux Race Condition
CVSS: 5.3v3.1MediumModified
AliasesUBUNTU-CVE-2020-12405DEBIAN-CVE-2020-12405
Published 09-07-2020Last modified 04-08-2024
Vulnerability summary
CVE-2020-12405 is a medium (CVSS 5.3) Race Condition vulnerability in canonical ubuntu_linux. EPSS estimates a 1.35% chance of exploitation in the next 30 days, higher than 71.1% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
5.3/10
010
Medium · v3.1 (NVD)EPSS score
1.35%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Advisory lineage
Upstream 0 · Downstream 27 · Related 12DLA-2243-1DLA-2247-1DSA-4695-1DSA-4702-1MGASA-2020-0300OPENSUSE-SU-2020:0789-1OPENSUSE-SU-2020:0799-1OPENSUSE-SU-2024:10600-1OPENSUSE-SU-2024:10601-1OPENSUSE-SU-2024:14572-1RHSA-2020:2378RHSA-2020:2379RHSA-2020:2380RHSA-2020:2381RHSA-2020:2382RHSA-2020:2611RHSA-2020:2613RHSA-2020:2614RHSA-2020:2615RHSA-2020:2616SUSE-SU-2020:14389-1SUSE-SU-2020:1556-1SUSE-SU-2020:1563-1SUSE-SU-2020:1591-1SUSE-SU-2020:1591-2USN-4383-1USN-4421-1
Timeline
- 09-07-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
When browsing a malicious page, a race condition in our SharedWorkerService could occur and lead to a potentially exploitable crash. This vulnerability affects Thunderbird < 68.9.0, Firefox < 77, and Firefox ESR < 68.9.
CVSS metrics
4 scores · 3 sources · 2 versionsMedium 5.3Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Low 2.6Preferred score · NVD (NIST)
AV:N/AC:H/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
1.35%
Chance of exploitation in the next 30 days
Percentile
71%
Versus all other CVEs
30-day change
0.00 pp
From 1.35% on 19-09-2026
19-09-202619-10-2026
EPSS score1.35%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (bugzilla.mozilla.org)
Maturity: unknown
Weaknesses
CWE · root cause- CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.
- 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.
Affected systems
Ubuntu5 products
- firefox< 77.0.1+build1-0ubuntu0.16.04.1 | < 77.0.1+build1-0ubuntu0.18.04.1 | < 77.0.1+build1-0ubuntu0.20.04.1
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- mozjs68All versions (No fix recorded)
- thunderbird< 1:68.10.0+build1-0ubuntu0.16.04.1 | < 1:68.10.0+build1-0ubuntu0.18.04.1 | < 1:68.10.0+build1-0ubuntu0.20.04.1
Mozilla3 products
- firefox≥ unspecified, < 77 | < 77.0
- firefox_esr≥ unspecified, < 68.9 | < 68.9.0
- thunderbird≥ unspecified, < 68.9.0 | < 68.9.0
Debian2 products
- firefox-esr< 68.9.0esr-1
- thunderbird< 1:68.9.0-1
Canonical1 product
- ubuntu_linuxEOL16.04 | 18.04 | 19.10 | 20.04
4 vendors · 11 products
