CVE-2024-9394

An attacker could, via a specially crafted multipart response, execute arbitrary JavaScript under the `resource://devtools` origin. This could allow them to access cross-origin JSON content. This access is limited to "same site" documents by the Site Isolation feature on desktop clients, but full cross-origin access is possible on Android versions. This vulnerability affects Firefox < 131, Firefox ESR < 128.3, Firefox ESR < 115.16, Thunderbird < 128.3, and Thunderbird < 131.

Published: 2024-10-01 Last update: 2025-11-03 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-9394 is rated Moderate Risk (43.8/100): CVSS High severity, with low exploitation likelihood (EPSS 0.50%). Review affected assets and schedule 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-2024-9394

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 2026-06-15 0.17% 0.50% +0.33%
2 2026-01-25 0.11% 0.17% +0.05%
3 2025-11-21 — 0.11% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-9394

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N 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:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
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:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]
6.1 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N 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:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.7 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2024-9394

OS Trackers for CVE-2024-9394

vendor priority summary link
alpine — CVE-2024-9394: 3 source package rows (firefox, firefox-esr, thunderbird); 334 state rows across 3 repos (3.20-community, 3.22-community, edge-community); fixed 0, open 334. https://security.alpinelinux.org/vuln/CVE-2024-9394
debian not yet assigned CVE-2024-9394 not yet assigned priority: Debian including 3 source packages (firefox, firefox-esr, thunderbird), 11 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 11. https://security-tracker.debian.org/tracker/CVE-2024-9394
redhat high — https://access.redhat.com/security/cve/CVE-2024-9394
suse high CVE-2024-9394 severity important: SUSE including 40 source package names (MozillaFirefox-128.3.1-112.231.1, MozillaFirefox-128.3.1-150200.152.155.1, …), 156 product×package rows across 52 product lines (Container suse/kiosk/firefox-esr, Image SLES12-SP5-SAP-Azure-LI-BYOS-Production, … (52 product lines)): Fixed 156. https://www.suse.com/security/cve/CVE-2024-9394/
ubuntu medium CVE-2024-9394 medium priority: Ubuntu including 9 source packages (firefox, mozjs102, …), 65 status rows across 8 suites (bionic, focal, jammy, noble, oracular, plucky, questing, upstream): DNE 33, needs-triage 10, ignored 9, not-affected 9, released 4. https://ubuntu.com/security/CVE-2024-9394

Affected software / configurations for CVE-2024-9394

Vendor Product Version Raw CPE
mozilla firefox < 131.0 cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
mozilla firefox_esr < 115.16.0 cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
mozilla firefox_esr >= 116.0, < 128.3.0 cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
mozilla thunderbird < 128.3 cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
mozilla thunderbird 129.0 cpe:2.3:a:mozilla:thunderbird:129.0:beta:*:*:*:*:*:*
mozilla thunderbird 129.0 cpe:2.3:a:mozilla:thunderbird:129.0:beta2:*:*:*:*:*:*
mozilla thunderbird 129.0 cpe:2.3:a:mozilla:thunderbird:129.0:beta3:*:*:*:*:*:*
mozilla thunderbird 129.0 cpe:2.3:a:mozilla:thunderbird:129.0:beta4:*:*:*:*:*:*
mozilla thunderbird 129.0 cpe:2.3:a:mozilla:thunderbird:129.0:beta5:*:*:*:*:*:*
mozilla thunderbird 129.0 cpe:2.3:a:mozilla:thunderbird:129.0:beta6:*:*:*:*:*:*

References for CVE-2024-9394

cvelogic Threat Intelligence