CVE-2024-9398

By checking the result of calls to `window.open` with specifically set protocol handlers, an attacker could determine if the application which implements that protocol handler is installed. This vulnerability affects Firefox < 131, Firefox ESR < 128.3, Thunderbird < 128.3, and Thunderbird < 131.

Published: 2024-10-01 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-9398 is rated Low Risk (35.9/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.58%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

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-2024-9398

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 0.83% 0.58% -0.25%
2 2026-02-20 0.60% 0.83% +0.23%
3 2025-11-21 — 0.60% —

Full EPSS history (16 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-9398

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 1.4 [email protected]
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 1.4 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2024-9398

OS Trackers for CVE-2024-9398

vendor priority summary link
alpine — CVE-2024-9398: 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-2024-9398
debian unimportant CVE-2024-9398 unimportant priority: Debian including 2 source packages (firefox, thunderbird), 6 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 6. https://security-tracker.debian.org/tracker/CVE-2024-9398
redhat low — https://access.redhat.com/security/cve/CVE-2024-9398
suse high CVE-2024-9398 severity important: SUSE including 38 source package names (MozillaFirefox-128.3.1-112.231.1, MozillaFirefox-128.3.1-150200.152.155.1, …), 154 product×package rows across 52 product lines (Container suse/kiosk/firefox-esr, Image SLES12-SP5-SAP-Azure-LI-BYOS-Production, … (52 product lines)): Fixed 154. https://www.suse.com/security/cve/CVE-2024-9398/
ubuntu medium CVE-2024-9398 medium priority: Ubuntu including 9 source packages (firefox, mozjs102, …), 65 status rows across 8 suites (bionic, focal, jammy, noble, oracular, plucky, questing, upstream): DNE 34, needs-triage 10, ignored 9, not-affected 9, released 3. https://ubuntu.com/security/CVE-2024-9398

Affected software / configurations for CVE-2024-9398

Vendor Product Version Raw CPE
mozilla firefox < 131.0 cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
mozilla firefox_esr < 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-2024-9398

cvelogic Threat Intelligence