CVE-2020-6799Public exploitNetwork attack vector

Code execution via file-association argument injection

Published Mar 2, 2020 · Updated Aug 4, 2024

Argument injection in Mozilla Firefox before 73 and Firefox ESR before 68.5 allows remote attackers to execute code through a crafted file URL. The Windows file-association command for unsupported types omits the -osint guard, so quoted URL data is parsed as Firefox command-line options. Execution requires Firefox to handle a non-default file type and a user to click a link in a third-party application that fails to sanitize the URL.

CVSS severity8.8
High
EPSS probability1.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Argument injection in Mozilla Firefox before 73 and Firefox ESR before 68.5 allows remote attackers to execute code through a crafted file URL. The Windows file-association command for unsupported types omits the -osint guard, so quoted URL data is parsed as Firefox command-line options. Execution requires Firefox to handle a non-default file type and a user to click a link in a third-party application that fails to sanitize the URL.

The record

CVE
CVE-2020-6799
Published
Mar 2, 2020
Updated
Aug 4, 2024
Vendor
Mozilla
Product
Firefox
Classifications
CWE-88, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 2, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <73
  2. Affected versionversion=unspecified <ESR68.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <73; version=unspecified <ESR68.5

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
5.1NIST NVDAV:N/AC:H/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-88Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
T1204.001User Execution: Malicious Link

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo