CVE-2018-12387: canonical ubuntu_linux Improper Input Validation
Vulnerability summary
CVE-2018-12387 is a critical (CVSS 9.1) Improper Input Validation vulnerability in canonical ubuntu_linux. EPSS estimates a 9.59% chance of exploitation in the next 30 days, higher than 95.4% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 10 · Related 6Timeline
- 18-10-2018PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
A vulnerability where the JavaScript JIT compiler inlines Array.prototype.push with multiple arguments that results in the stack pointer being off by 8 bytes after a bailout. This leaks a memory address to the calling function which can be used as part of an exploit inside the sandboxed content process. This vulnerability affects Firefox ESR < 60.2.2 and Firefox < 62.0.3.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated9.1CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- OSV · DebianEcosystem advisory · calculated9.1CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS trend
Probability
9.59%
Chance of exploitation in the next 30 days
Percentile
95%
Versus all other CVEs
30-day change
+1.17 pp
From 8.42% on 21-09-2026
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 causeAffected systems
Redhat6 products
- enterprise_linux_desktop6.0 | 7.0
- enterprise_linux_server6.0 | 7.0
- enterprise_linux_server_aus7.6
- enterprise_linux_server_eus7.5 | 7.6
- enterprise_linux_server_tus7.6
Ubuntu4 products
- firefox< 62.0.3+build1-0ubuntu0.14.04.2 | < 62.0.3+build1-0ubuntu0.16.04.2 | < 62.0.3+build1-0ubuntu0.18.04.1
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- thunderbird< 1:60.4.0+build2-0ubuntu0.14.04.1 | < 1:60.4.0+build2-0ubuntu0.16.04.1 | < 1:60.4.0+build2-0ubuntu0.18.04.1
Debian2 products
- firefox-esr< 60.2.2esr-1
- debian_linuxEOL9.0
Mozilla2 products
- firefox≥ unspecified, < 62.0.3 | < 60.2.2 | < 62.0.3
- firefox_esr≥ unspecified, < 60.2.2
Canonical1 product
- ubuntu_linuxEOL14.04 | 16.04 | 18.04
5 vendors · 15 products
References
14 links- bugzilla.mozilla.org/show_bug.cgi?id=1493903X Refsource CONFIRMExploitIssue TrackingPatchVendor Advisory
