CVE-2024-3863

CRITICAL
INFO Priority: 0.08 BB Relevance: 80/100
Published: 2024-04-16 Modified: 2026-11-04 First seen: 2026-11-03 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction Conf. Impact Integ. Impact

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
S: Unchanged
C: High
I: High
A: High

Description

The executable file warning was not presented when downloading .xrm-ms files. *Note: This issue only affected Windows operating systems. Other operating systems are unaffected.* This vulnerability affects Firefox < 125, Firefox ESR < 115.10, and Thunderbird < 115.10.

Weakness Classification (1)

Affected Software (9)

VendorProductVersion
Mozilla Firefox unspecified < 125
Mozilla Firefox unspecified < 125
Mozilla Firefox ESR unspecified < 115.10
Mozilla Firefox ESR unspecified < 115.10
Mozilla Thunderbird unspecified < 115.10
Mozilla Thunderbird unspecified < 115.10
mozilla firefox < 115.10.0
mozilla firefox < 125.0
mozilla thunderbird < 115.10

Bug Bounty Relevance

80 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

9.8 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploitation Probability

0.81%
Raw Score 0.008120
Percentile 57.5%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00812
2026-11-12
0.00812
2026-11-10
0.00812
2026-11-09
0.00812
2026-11-08
0.00812
2026-11-07
0.00812
2026-11-06
0.00812
2026-11-05
0.00812
2026-11-04
0.00812
2026-11-03
0.00812

Intelligence Sources

mitre ref →
nvd ref →