CVE-2018-5146

An out of bounds memory write while processing Vorbis audio data was reported through the Pwn2Own contest. This vulnerability affects Firefox < 59.0.1, Firefox ESR < 52.7.2, and Thunderbird < 52.7.

Published: 2018-06-11 Last update: 2025-11-25 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-5146 is rated High Risk (74.5/100): CVSS High severity, with high exploitation likelihood (EPSS 55.64%, 98th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +10.84% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2018-5146

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-17 44.80% 55.64% +10.84%
2 2026-04-13 41.11% 44.80% +3.69%
3 2026-03-17 — 41.11% —

Full EPSS history (34 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-5146

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2018-5146

OS Trackers for CVE-2018-5146

vendor priority summary link
alpine — CVE-2018-5146: 1 source package rows (libvorbis); 10 state rows across 10 repos (3.10-main, 3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 10, open 0. https://security.alpinelinux.org/vuln/CVE-2018-5146
debian not yet assigned CVE-2018-5146 not yet assigned priority: Debian including 4 source packages (firefox, firefox-esr, libvorbis, thunderbird), 16 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 16. https://security-tracker.debian.org/tracker/CVE-2018-5146
gentoo normal CVE-2018-5146: 1 GLSA(s) (201811-13), 2 atom(s) (mail-client/thunderbird, mail-client/thunderbird-bin); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2018-5146
redhat critical — https://access.redhat.com/security/cve/CVE-2018-5146
suse medium CVE-2018-5146 severity moderate: SUSE including 400 source package names (MozillaFirefox-102.11.0-150200.152.87.1, MozillaFirefox-115.10.0-150200.152.134.1, …), 680 product×package rows across 82 product lines (SUSE CaaS Platform 4.0, SUSE Enterprise Storage 6, … (82 product lines)): Fixed 315, Known Affected 231, Known Not Affected 134. https://www.suse.com/security/cve/CVE-2018-5146/
ubuntu medium CVE-2018-5146 medium priority: Ubuntu including 4 source packages (firefox, firefox-esr, libvorbis, thunderbird), 20 status rows across 5 suites (artful, bionic, trusty, upstream, xenial): released 13, DNE 4, not-affected 2, needs-triage 1. https://ubuntu.com/security/CVE-2018-5146

Affected software / configurations for CVE-2018-5146

Vendor Product Version Raw CPE
redhat enterprise_linux_desktop 6.0 cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*
redhat enterprise_linux_desktop 7.0 cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
redhat enterprise_linux_server 6.0 cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*
redhat enterprise_linux_server 7.0 cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
redhat enterprise_linux_server_aus 7.4 cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4:*:*:*:*:*:*:*
redhat enterprise_linux_server_aus 7.6 cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:*
redhat enterprise_linux_server_eus 7.4 cpe:2.3:o:redhat:enterprise_linux_server_eus:7.4:*:*:*:*:*:*:*
redhat enterprise_linux_server_eus 7.5 cpe:2.3:o:redhat:enterprise_linux_server_eus:7.5:*:*:*:*:*:*:*
redhat enterprise_linux_server_eus 7.6 cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:*
redhat enterprise_linux_server_tus 7.4 cpe:2.3:o:redhat:enterprise_linux_server_tus:7.4:*:*:*:*:*:*:*
redhat enterprise_linux_server_tus 7.6 cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:*
redhat enterprise_linux_workstation 6.0 cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*
redhat enterprise_linux_workstation 7.0 cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*
debian debian_linux 7.0 cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
canonical ubuntu_linux 14.04 cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 16.04 cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 17.10 cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:*
mozilla firefox < 52.7.2 cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
mozilla firefox < 59.0.1 cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
mozilla thunderbird < 52.7.0 cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*

References for CVE-2018-5146

URL Tags
http://www.securityfocus.com/bid/103432 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1040544 Third Party Advisory VDB Entry
https://access.redhat.com/errata/RHSA-2018:0549 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:0647 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:0648 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:0649 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:1058 Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1446062 Issue Tracking Permissions Required Vendor Advisory
https://lists.debian.org/debian-lts-announce/2018/03/msg00022.html Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/03/msg00029.html Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/04/msg00033.html Mailing List Third Party Advisory
https://security.gentoo.org/glsa/201811-13 Third Party Advisory
https://usn.ubuntu.com/3545-1/ Third Party Advisory
https://usn.ubuntu.com/3599-1/ Third Party Advisory
https://usn.ubuntu.com/3604-1/ Third Party Advisory
https://www.debian.org/security/2018/dsa-4140 Third Party Advisory
https://www.debian.org/security/2018/dsa-4143 Third Party Advisory
https://www.debian.org/security/2018/dsa-4155 Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2018-08/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2018-09/ Vendor Advisory
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