{"id":"CVE-2024-4978","kind":"vulnerability","aliases":["CVE-2024-4978"],"related":[],"title":"javs viewer: Justice AV Solutions Viewer Setup 8.3.7.250-1 contains a malicious binary when executed and is signed with an…","description":"Justice AV Solutions (JAVS) Viewer installer contains a malicious version of ffmpeg.exe, named fffmpeg.exe (SHA256: 421a4ad2615941b177b6ec4ab5e239c14e62af2ab07c6df1741e2a62223223c4). When run, this creates a backdoor connection to a malicious C2 server.\n\nCISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","summary":"The JAVS Viewer installer ships a trojanized ffmpeg.exe (named fffmpeg.exe) that opens a backdoor connection to a malicious command-and-control server when run. An attacker who gets the installed binary onto a machine gets remote access to it.","severity":"critical","cvss":8.7,"epss":null,"exploited":true,"exploited_at":"2024-05-29T00:00:00+00:00","products":[{"name":"Justice AV Solutions Viewer","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"javs viewer","fixed":[],"affected":"= 8.3.7.250","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","javs-viewer","vendor","windows"],"not_affected_if":["not-installed"],"how_to_check":"Search the machine for fffmpeg.exe with SHA256 421a4ad2615941b177b6ec4ab5e239c14e62af2ab07c6df1741e2a62223223c4","fix":"Apply the vendor mitigations or stop using JAVS Viewer, per the CISA required action","status":"open","published_at":"2024-05-23T02:15:09+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T21:00:39+00:00","updated_at":"2026-10-23T22:29:05+00:00","category":"vendor","confidence":0.6,"triage":{"at":"2026-10-23T21:00:39Z","model":"claude-haiku-5-5","output":{"fix":"Apply the vendor mitigations or stop using JAVS Viewer, per the CISA required action\nunknown","reach":"internet","impact":"high","summary":"The JAVS Viewer installer ships a trojanized ffmpeg.exe (named fffmpeg.exe) that opens a backdoor connection to a malicious command-and-control server when run. An attacker who gets the installed binary onto a machine gets remote access to it.","category":"vendor","who_cares":["javs-viewer","windows"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker gets a backdoor and remote control of the machine running the installer","analyst_note":"Find the vendor advisory from Justice AV Solutions for a clean version or removal steps and confirm which JAVS Viewer versions shipped the malicious file.","how_to_check":"Search the machine for fffmpeg.exe with SHA256 421a4ad2615941b177b6ec4ab5e239c14e62af2ab07c6df1741e2a62223223c4\nunknown","needs_analyst":true,"not_affected_if":["not-installed"],"user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"critical"},"cost_usd":0.000501,"input_tokens":2907,"output_tokens":420,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-1':9A '-2024':20A,23A '-4978':21A,24A '421a4ad2615941b177b6ec4ab5e239c14e62af2ab07c6df1741e2a62223223c4':90C '8.3.7.250':8A 'access':74B 'action':105C 'appli':106C 'attack':63B 'av':4A,26A,76C 'backdoor':50B,96C 'binari':13A,68B 'c2':101C 'cisa':103C 'command':56B 'command-and-control':55B 'connect':51B,97C 'contain':10A,81C 'control':58B 'creat':94C 'cve':19A,22A 'discontinu':112C 'execut':15A 'exploit':31B 'fffmpeg.exe':46B,88C 'ffmpeg.exe':44B,86C 'get':65B,72B 'instal':40B,67B,80C 'instruct':110C 'jav':1A,33B,38B,78C 'javs':29A 'javs-view':32B 'justic':3A,75C 'justice':25A 'machin':71B 'malici':12A,54B,83C,100C 'mitig':107C,118C 'name':45B,87C 'onto':69B 'open':48B 'per':108C 'product':116C 'remot':73B 'requir':104C 'run':61B,92C 'server':59B,102C 'setup':7A 'sha256':89C 'ship':41B 'sign':18A 'solut':5A,77C 'solutions':27A 'trojan':43B 'unavail':120C 'use':113C 'vendor':35B,109C 'version':84C 'viewer':2A,6A,28A,30A,34B,39B,79C 'window':36B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2024-05-23T02:15:09+00:00","kev":{"dateAdded":"2024-05-29","dueDate":"2024-06-19","requiredAction":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"9119a7d8-5eab-497f-8521-727c672e3725","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2024-4978","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2024-4978","severity":null,"published_at":"2024-05-29T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T15:39:41+00:00","note":null},{"source":"nvd","external_id":"CVE-2024-4978","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-4978","severity":null,"published_at":"2024-05-23T02:15:09+00:00","modified_at":"2026-06-17T08:03:19+00:00","first_seen_at":"2026-10-23T22:29:05+00:00","fetched_at":"2026-10-23T22:29:05+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}