Threats / Crestron / CVE-2019-3929
CVE-2019-3929
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-08-04
Crestron Multiple Products vulnerability
Multiple Crestron products contain a command injection vulnerability in the file_transfer.cgi endpoint, allowing unauthenticated remote attackers to execute arbitrary OS commands with root privileges.
Verdict
Today item — known-exploited.
A critical remote code execution flaw affecting Crestron devices enables attackers to gain complete system control without authentication. The high EPSS score and active exploitation in the wild indicate immediate risk to deployed infrastructure.
CISA KEV Yes · 2022-04-155EPSS 0.98952 (verify live)6Exploit Weaponized · public PoC7CVSS 9.8 (CISA)4CISA SSVC Exploitation: active · Automatable: yes · Impact: total4
01
Is it exploitable?
— the evidence, ranked above the scoreExploit available
Fully weaponized — public exploit code is cataloged for this vulnerability.We link the existence of the exploit; we do not host or redistribute payloads.
Reported exploitation
747 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-04-15).
Probability (EPSS)
EPSS 0.98952 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
CVSS 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) · Affected: Crestron, Multiple Products. Confirm exact fixed builds in the vendor advisory.CVSS — CISA-assigned via the ADP container (CVE.org), version 3.1; the CNA left no metrics, so CISA's own score is used ahead of NVD.
Weakness (CWE)
Mapped to CWE-79 Cross-site Scripting (XSS) — weakness family: Web / client.CWE — CNA-assigned (CVE.org); the weakness class drives how the flaw is exploited.
CISA SSVC (triage disposition)
Exploitation: active · Automatable: yes · Technical Impact: totalCISA's own stakeholder-specific triage inputs, published in the CVE record (CISA Coordinator role). NOTE: this is CISA's three decision points; the final Act/Attend/Track decision also requires a Mission & Well-being input not published here, so no overall decision is asserted.
Currency of the record
CISA added this to its KEV catalog 1081 days after the CVE record was published.KEV lag = CISA-KEV dateAdded − CVE.org datePublished; a floor on how long the known-exploited flaw sat in the public record before the federal catalog listed it. Severity/weakness here is CNA- or CISA-assigned (current at disclosure), independent of NVD's analysis backlog.
Public exploit available
Public exploit tooling is catalogued for this CVE (a functional/weaponized public exploit). Catalog entries: Metasploit module, nuclei template. We link the catalog page(s) only — no payload or code is hosted or restated here.Link, never host — the catalog page is the source; basicsecurity.net does not redistribute payloads.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I identify the file_transfer.cgi endpoint as exposed and unprotected on the target Crestron device.
Business
Attackers can discover vulnerable devices through network scanning, creating widespread exposure across customer deployments.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I craft a malicious HTTP request injecting shell commands into the file_transfer.cgi parameters.
Business
The lack of input validation allows arbitrary command execution, bypassing all authentication controls.
3
Lateral reach — past segmentation narrative 3
Attacker
I execute commands with root-level privileges to install backdoors, exfiltrate data, or pivot to connected systems.
Business
Complete compromise of building automation, security systems, or AV infrastructure enables facility disruption or data theft.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05